1
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Harrison SJ, Malkin SY, Joye SB. Dispersant addition, but not nutrients, stimulated blooms of multiple hydrocarbonoclastic genera in nutrient-replete coastal marine surface waters. MARINE POLLUTION BULLETIN 2024; 204:116490. [PMID: 38843703 DOI: 10.1016/j.marpolbul.2024.116490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Revised: 05/08/2024] [Accepted: 05/09/2024] [Indexed: 06/17/2024]
Abstract
The range of impacts of chemical dispersants on indigenous marine microbial communities and their activity remains poorly constrained. We tested the response of nearshore surface waters chronically exposed to oil leakage from a downed platform and supplied with nutrients by the Mississippi River to Corexit dispersant and nutrient additions. As assessed using 14C-labeled tracers, hexadecane mineralization potential was orders of magnitude higher in all unamended samples than in previously assessed bathypelagic communities. Nutrient additions stimulated microbial mortality but did not affect community composition and had no generalizable effect on hydrocarbon mineralization potential. By contrast, Corexit amendments caused a rapid shift in community composition and a drawdown of inorganic nitrogen and orthophosphate though no generalizable effect on hydrocarbon mineralization potential. The hydrocarbonoclastic community's response to dispersants is largely driven by the relative availability of organic substrates and nutrients, underscoring the role of environmental conditions and multiple interacting stressors on hydrocarbon degradation potential.
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Affiliation(s)
- Sarah J Harrison
- Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA
| | - Sairah Y Malkin
- Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA
| | - Samantha B Joye
- Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA.
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2
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Atakpa EO, Yan B, Okon SU, Liu Q, Zhang D, Zhang C. Asynchronous application of modified biochar and exogenous fungus Scedosporium sp. ZYY for enhanced degradation of oil-contaminated intertidal mudflat sediment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:20637-20650. [PMID: 38383925 DOI: 10.1007/s11356-024-32419-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 02/07/2024] [Indexed: 02/23/2024]
Abstract
Intertidal mudflats are susceptible to oil pollution due to their proximity to discharges from industries, accidental spills from marine shipping activities, oil drilling, pipeline seepages, and river outflows. The experimental study was divided into two periods. In the first period, microcosm trials were carried out to examine the effect of chemically modified biochar on biological hydrocarbon removal from sediments. The modified biochar's surface area increased from 2.544 to 25.378 m2/g, followed by a corresponding increase in the hydrogen-carbon and oxygen-carbon ratio, indicating improved stability and polarity. In the second period, the effect of exogenous fungus - Scedoporium sp. ZYY on the bacterial community structure was examined in relation to total petroleum hydrocarbon (TPH) removal. The maximum TPH removal efficiency of 82.4% was achieved in treatments with the modified biochar, followed by a corresponding increase in Fluorescein diacetate hydrolysis activity. Furthermore, high-throughput 16S RNA gene sequencing employed to identify changes in the bacterial community of the original sediment and treatments before and after fungal inoculation revealed Proteobacteria as the dominant phylum. In addition, it was observed that Scedoporium sp. ZYY promoted the proliferation of specific TPH-degraders, particularly, Hyphomonas adhaerens which accounted for 77% of the total degrading populations in treatments where TPH removal was highest. Findings in this study provide valuable insights into the effect of modified biochar and the fundamental role of exogenous fungus towards the effective degradation of oil-contaminated intertidal mudflat sediments.
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Affiliation(s)
- Edidiong Okokon Atakpa
- Institute of Marine Biology and Pharmacology, Ocean College, Zhejiang University, Zhoushan, 316021, Zhejiang, China
| | - Bozhi Yan
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541006, China
| | - Samuel Ukpong Okon
- Institute of Port, Coastal, and Offshore Engineering, Ocean College, Zhejiang University, Zhoushan, 316021, China
- Suzhou Industrial Technological Research Institute of Zhejiang University, Suzhou, 215163, China
| | - Qing Liu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541006, China
| | - Dongdong Zhang
- Institute of Marine Biology and Pharmacology, Ocean College, Zhejiang University, Zhoushan, 316021, Zhejiang, China
| | - Chunfang Zhang
- Institute of Marine Biology and Pharmacology, Ocean College, Zhejiang University, Zhoushan, 316021, Zhejiang, China.
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3
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Xin Q, Saborimanesh N, Ridenour C, Farooqi H. Fate, behaviour and microbial response of diluted bitumen and conventional crude spills in a simulated warm freshwater environment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 343:123224. [PMID: 38159633 DOI: 10.1016/j.envpol.2023.123224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/22/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
Diluted bitumen (DB), one of the most transported unconventional crude oils in Canada's pipelines, raises public concerns due to its potential spillage into freshwater environments. This study aimed to compare the fate and behaviour of DB versus conventional crude (CC) in a simulated warm freshwater environment. An equivalent of 10 L of either DB or CC was spilled into 1200 L of North Saskatchewan River (NSR) water containing natural NSR sediment (2.4 kg) in a mesoscale spill tank and its fate and behaviour at air/water temperatures of 18 °C/24 °C were monitored for 56 days. Oil mass distribution analysis showed that 42.3 wt % of CC and 63.6 wt% of DB resided in the oil slicks at the end of 56-day tests, consisting mainly high molecular weight (HMW) compounds (i.e., resins and asphaltenes). The lost oil contained mainly low molecular weight (LMW) compounds (i.e., light saturates and some aromatics) into the atmosphere, water column, and sediment through collective weathering processes. Notably, weathered CC emulsified with water and remained floating until the end, while the weathered DB mat started to lose its buoyancy after 24 days under quiescent conditions and resurfaced once waves were applied. Analysis of the microbial communities of water pre- and post-spills revealed the replacement of indigenous microbial communities with hydrocarbon-degrading species. Exposure to CC reduced the microbial diversity by 12%, while exposure to DB increased the diversity by 10%. During the early stages of the spill (up to Day 21), most dominant species were positively correlated with the benzene, toluene, ethylbenzene, and xylenes (BTEX) content or polycyclic aromatic hydrocarbon (PAH) content of the water column, while the dominant species at the later stages (Days 21-56) of the spill were negatively correlated with BTEX or PAH content and positively correlated with the total organic carbon (TOC) content in waters.
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Affiliation(s)
- Qin Xin
- Natural Resources Canada, CanmetENERGY, 1 Oil Patch Drive, Devon, Alberta, T9G 1A8, Canada.
| | - Nayereh Saborimanesh
- Natural Resources Canada, CanmetENERGY, 1 Oil Patch Drive, Devon, Alberta, T9G 1A8, Canada
| | - Christine Ridenour
- Natural Resources Canada, CanmetENERGY, 1 Oil Patch Drive, Devon, Alberta, T9G 1A8, Canada
| | - Hena Farooqi
- Natural Resources Canada, CanmetENERGY, 1 Oil Patch Drive, Devon, Alberta, T9G 1A8, Canada
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4
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Ren H, Deng Y, Zhao D, Jin W, Xie G, Peng B, Dai H, Wang B. Structures and diversities of bacterial communities in oil-contaminated soil at shale gas well site assessed by high-throughput sequencing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:10766-10784. [PMID: 38200199 DOI: 10.1007/s11356-023-31344-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 11/30/2023] [Indexed: 01/12/2024]
Abstract
Currently, there is limited understanding of the structures and variabilities of bacterial communities in oil-contaminated soil within shale gas development. The Changning shale gas well site in Sichuan province was focused, and high-throughput sequencing was used to investigate the structures of bacterial communities and functions of bacteria in soil with different degrees of oil pollution. Furthermore, the influences of the environmental factors including pH, moisture content, organic matter, total nitrogen, total phosphorus, oil, and the biological toxicity of the soil on the structures of bacterial communities were analyzed. The results revealed that Proteobacteria and Firmicutes predominated in the oil-contaminated soil. α-Proteobacteria and γ-Proteobacteria were the main classes under the Proteobacteria phylum. Bacilli was the main class in the Firmicutes phylum. Notably, more bacteria were only found in CN-5 which was the soil near the storage pond for abandoned drilling mud, including Marinobacter, Balneola, Novispirillum, Castellaniella, and Alishewanella. These bacteria exhibited resilience to higher toxicity and demonstrated proficiency in oil degradation. The functions including carbohydrate transport and metabolism, energy metabolism, replication, recombination and repair replication, signal transduction mechanisms, and amino acid transport and metabolism responded differently to varying concentrations of oil. The disparities in bacterial genus composition across samples stemmed from a complex play of pH, moisture content, organic matter, total nitrogen, total phosphorus, oil concentration, and biological toxicity. Notably, bacterial richness correlated positively with moisture content, while bacterial diversity showed a significant positive correlation with pH. Acidobacteria exhibited a significant positive correlation with moisture content. Litorivivens and Luteimonas displayed a significant negative correlation with pH, while Rhizobium exhibited a significant negative correlation with moisture content. Pseudomonas, Proteiniphilum, and Halomonas exhibited positive correlations not only with organic matter but also with oil concentration. Total nitrogen exhibited a significant positive correlation with Taonella and Sideroxydans. On the other hand, total phosphorus showed a significant negative correlation with Sphingomonas. Furthermore, Sphingomonas, Gp6, and Ramlibacter displayed significant negative correlations with biological toxicity. The differential functions exhibited no significant correlation with environmental factors but displayed a significant positive correlation with the Proteobacteria phylum. Aridibacter demonstrated a significant positive correlation with cell motility and cellular processes and signaling. Conversely, Pseudomonas, Proteiniphilum, and Halomonas were negatively correlated with differential functions, particularly in amino acid metabolism, carbohydrate metabolism, and membrane transport. Compared with previous research, more factors were considered in this research when studying structural changes in bacterial communities, such as physicochemical properties and biological toxicity of soil. In addition, the correlations of differential functions of communities with environmental factors, bacterial phyla, and genera were investigated.
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Affiliation(s)
- Hongyang Ren
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, 610500, China
| | - Yuanpeng Deng
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Dan Zhao
- Exploration Division, China National Petroleum Tarim Oilfield Branch, Korla, People's Republic of China
| | - Wenhui Jin
- Sichuan Energy Investment Group Co., Ltd., Chengdu, 610041, People's Republic of China
| | - Guilin Xie
- Sichuan Changning Natural Gas Development Co., Ltd, Yibin, 644005, People's Republic of China
| | - Baoliang Peng
- Research Institute of Petroleum Exploration & Development, Beijing, 100083, China
| | - Huayan Dai
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Bing Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China.
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5
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Bharali P, Gogoi B, Sorhie V, Acharjee SA, Walling B, Alemtoshi, Vishwakarma V, Shah MP. Autochthonous psychrophilic hydrocarbonoclastic bacteria and its ecological function in contaminated cold environments. Biodegradation 2024; 35:1-46. [PMID: 37436665 DOI: 10.1007/s10532-023-10042-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 05/30/2023] [Indexed: 07/13/2023]
Abstract
Petroleum hydrocarbon (PH) pollution has mostly been caused by oil exploration, extraction, and transportation activities in colder regions, particularly in the Arctic and Antarctic regions, where it serves as a primary source of energy. Due to the resilience feature of nature, such polluted environments become the realized ecological niches for a wide community of psychrophilic hydrocarbonoclastic bacteria (PHcB). In contrast, to other psychrophilic species, PHcB is extremely cold-adapted and has unique characteristics that allow them to thrive in greater parts of the cold environment burdened with PHs. The stated group of bacteria in its ecological niche aids in the breakdown of litter, turnover of nutrients, cycling of carbon and nutrients, and bioremediation. Although such bacteria are the pioneers of harsh colder environments, their growth and distribution remain under the influence of various biotic and abiotic factors of the environment. The review discusses the prevalence of PHcB community in colder habitats, the metabolic processes involved in the biodegradation of PH, and the influence of biotic and abiotic stress factors. The existing understanding of the PH metabolism by PHcB offers confirmation of excellent enzymatic proficiency with high cold stability. The discovery of more flexible PH degrading strategies used by PHcB in colder environments could have a significant beneficial outcome on existing bioremediation technologies. Still, PHcB is least explored for other industrial and biotechnological applications as compared to non-PHcB psychrophiles. The present review highlights the pros and cons of the existing bioremediation technologies as well as the potential of different bioaugmentation processes for the effective removal of PH from the contaminated cold environment. Such research will not only serve to investigate the effects of pollution on the basic functional relationships that form the cold ecosystem but also to assess the efficacy of various remediation solutions for diverse settings and climatic conditions.
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Affiliation(s)
- Pranjal Bharali
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India.
| | - Bhagyudoy Gogoi
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India
| | - Viphrezolie Sorhie
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India
| | - Shiva Aley Acharjee
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India
| | - Bendangtula Walling
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India
| | - Alemtoshi
- Applied Environmental Microbial Biotechnology Laboratory, Department of Environmental Science, Nagaland University, Lumami, Nagaland, 798627, India
| | - Vinita Vishwakarma
- Centre for Nanoscience and Nanotechnology, Galgotias University, Greater Noida, NCR Delhi, India
| | - Maulin Pramod Shah
- Industrial Waste Water Research Lab, Division of Applied and Environmental Microbiology Lab at Enviro Technology Ltd., Ankleshwar, Gujarat, India
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6
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Langeloh H, Greer CW, Vergeynst L, Hakvåg S, Øverjordet IB, Bakke I, Sørensen L, Brakstad OG. Comparison of two field systems for determination of crude oil biodegradation in cold seawater. MARINE POLLUTION BULLETIN 2024; 199:115919. [PMID: 38134872 DOI: 10.1016/j.marpolbul.2023.115919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 12/07/2023] [Accepted: 12/10/2023] [Indexed: 12/24/2023]
Abstract
Marine oil spills have devastating environmental impacts and extrapolation of experimental fate and impact data from the lab to the field remains challenging due to the lack of comparable field data. In this work we compared two field systems used to study in situ oil depletion with emphasis on biodegradation and associated microbial communities. The systems were based on (i) oil impregnated clay beads and (ii) hydrophobic Fluortex adsorbents coated with thin oil films. The bacterial communities associated with the two systems displayed similar compositions of dominant bacterial taxa. Initial abundances of Oceanospirillales were observed in both systems with later emergences of Flavobacteriales, Alteromonadales and Rhodobacterales. Depletion of oil compounds was significantly faster in the Fluortex system and most likely related to the greater bioavailability of oil compounds as compared to the clay bead system.
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Affiliation(s)
- Hendrik Langeloh
- The Norwegian University of Science and Technology (NTNU), Dept. of Biotechnology and Food Science, Sem Sælandsvei 6/8, 7491 Trondheim, Norway.
| | - Charles W Greer
- National Research Council Canada, Energy, Mining and Environment Research Centre, 75 Bd de Mortagne, Boucherville, QC J4B 6Y4, Montreal, Canada; McGill University, Natural Resource Sciences, 21111 Lakeshore Road, Sainte-Anne-de-Bellevue, H9X 3V9 Montreal, Quebec, Canada.
| | - Leendert Vergeynst
- Arctic Research Centre, Department of Biology, Aarhus University, Ny Munkegade 114, 8000 Aarhus, Denmark; Aarhus University Centre for Water Technology, Department of Biological and Chemical Engineering, Aarhus University, Gustav Wieds vej 10 D, 8000 Aarhus, Denmark.
| | - Sigrid Hakvåg
- SINTEF Ocean, Department of Climate and Environment, Brattørkaia 17b, 7010 Trondheim, Norway.
| | - Ida B Øverjordet
- SINTEF Ocean, Department of Climate and Environment, Brattørkaia 17b, 7010 Trondheim, Norway.
| | - Ingrid Bakke
- SINTEF Ocean, Department of Climate and Environment, Brattørkaia 17b, 7010 Trondheim, Norway.
| | - Lisbet Sørensen
- SINTEF Ocean, Department of Climate and Environment, Brattørkaia 17b, 7010 Trondheim, Norway.
| | - Odd G Brakstad
- SINTEF Ocean, Department of Climate and Environment, Brattørkaia 17b, 7010 Trondheim, Norway.
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7
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Zhou Y, Wang Y, Yang L, Kong Q, Zhang H. Microbial degradation mechanisms of surface petroleum contaminated seawater in a typical oil trading port. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 324:121420. [PMID: 36906058 DOI: 10.1016/j.envpol.2023.121420] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/14/2023] [Accepted: 03/04/2023] [Indexed: 05/25/2023]
Abstract
Petroleum hydrocarbons are significant new persistent organic pollutants for marine oil spill risk areas. Oil trading ports, in turn, have become major bearers of the risk of offshore oil pollution. However, studies on the molecular mechanisms of microbial degradation of petroleum pollutants by natural seawater are limited. Here, an in situ microcosm study was conducted. Combined with metagenomics, differences in metabolic pathways and in the gene abundances of total petroleum hydrocarbons (TPH) are revealed under different conditions. About 88% degradation of TPH was shown after 3 weeks of treatment. The positive responders to TPH were concentrated in the genera Cycloclasticus, Marivita and Sulfitobacter of the orders Rhodobacterales and Thiotrichales. The genera Marivita, Roseobacter, Lentibacter and Glaciecola were key degradation species when mixing dispersants with oil, and all of the above are from the Proteobacteria phylum. The analysis showed that the biodegradability of aromatic compounds, polycyclic aromatic hydrocarbon and dioxin were enhanced after the oil spill, and genes with higher abundances of bphAa, bsdC, nahB, doxE and mhpD were found, but the photosynthesis-related mechanism was inhibited. The dispersant treatment effectively stimulated the microbial degradation of TPH and then accelerated the succession of microbial communities. Meanwhile, functions such as bacterial chemotaxis and carbon metabolism (cheA, fadeJ and fadE) were better developed, but the degradation of persistent organic pollutants such as polycyclic aromatic hydrocarbons was weakened. Our study provides insights into the metabolic pathways and specific functional genes for oil degradation by marine microorganisms and will help improve the application and practice of bioremediation.
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Affiliation(s)
- Yumiao Zhou
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China
| | - Ying Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, China
| | - Likun Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, China
| | - Qiang Kong
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China
| | - Huanxin Zhang
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China.
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8
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Delacuvellerie A, Brusselman A, Cyriaque V, Benali S, Moins S, Raquez JM, Gobert S, Wattiez R. Long-term immersion of compostable plastics in marine aquarium: Microbial biofilm evolution and polymer degradation. MARINE POLLUTION BULLETIN 2023; 189:114711. [PMID: 36807047 DOI: 10.1016/j.marpolbul.2023.114711] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 02/02/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
The best-selling compostable plastics, polylactic acid (PLA) and polybutylene adipate-co-terephthalate (PBAT), can accidentally end up in the marine environment due to plastic waste mismanagement. Their degradation and colonization by microbial communities are poorly documented in marine conditions. To better understand their degradation, as well as the dynamics of bacterial colonization after a long immersion time (99, 160, and 260 days), PBAT, semicrystalline, and amorphous PLA films were immersed in a marine aquarium. Sequencing and chemical analyses were used in parallel to characterize these samples. Despite the variation in the chemical intrinsic parameters of these plastics, their degradation remains very slow. Microbial community structure varied according to the immersion time with a high proportion of Archaea. Moreover, the plastisphere structure of PBAT was specific. A better understanding of compostable plastic degradability is crucial to evaluate their impact on ecosystems and to eco-design new recyclable plastics with optimal degradation properties.
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Affiliation(s)
- Alice Delacuvellerie
- Proteomics and Microbiology department, University of Mons, 20 place du parc, 7000 Mons, Belgium
| | - Axelle Brusselman
- Oceanology department, UR FOCUS, University of Liège, 11 Allée du 6 août, 4000 Liège, Belgium
| | - Valentine Cyriaque
- Proteomics and Microbiology department, University of Mons, 20 place du parc, 7000 Mons, Belgium; Section of Microbiology, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, 1, Bygning, 1-1-215, Denmark
| | - Samira Benali
- Polymer and Composite Materials Department, University of Mons, 15 Avenue Maistriau, 7000 Mons, Belgium
| | - Sébastien Moins
- Polymer and Composite Materials Department, University of Mons, 15 Avenue Maistriau, 7000 Mons, Belgium
| | - Jean-Marie Raquez
- Polymer and Composite Materials Department, University of Mons, 15 Avenue Maistriau, 7000 Mons, Belgium
| | - Sylvie Gobert
- Oceanology department, UR FOCUS, University of Liège, 11 Allée du 6 août, 4000 Liège, Belgium; STARESO, Pointe Revellata, BP33, 20260 Corse, France
| | - Ruddy Wattiez
- Proteomics and Microbiology department, University of Mons, 20 place du parc, 7000 Mons, Belgium.
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Succession Patterns of Microbial Composition and Activity following the Diesel Spill in an Urban River. Microorganisms 2023; 11:microorganisms11030698. [PMID: 36985271 PMCID: PMC10058704 DOI: 10.3390/microorganisms11030698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/06/2023] [Accepted: 03/06/2023] [Indexed: 03/11/2023] Open
Abstract
Diesel spills in freshwater systems have adverse impacts on the water quality and the shore wetland. Microbial degradation is the major and ultimate natural mechanism that can clean the diesel from the environment. However, which, and how fast, diesel-degrading microorganisms could degrade spilled diesel has not been well-documented in river water. Using a combination of 14C-/3H--based radiotracer assays, analytical chemistry, MiSeq sequencing, and simulation-based microcosm incubation approaches, we demonstrated succession patterns of microbial diesel-degrading activities, and bacterial and fungal community compositions. The biodegradation activities of alkanes and polycyclic aromatic hydrocarbons (PAHs) were induced within 24 h after diesel addition, and reached their maximum after incubation for 7 days. Potential diesel-degrading bacteria Perlucidibaca, Acinetobacter, Pseudomonas, Acidovorax, and Aquabacterium dominated the community initially (day 3 and day 7), but later community structure (day 21) was dominated by bacteria Ralstonia and Planctomyces. The key early fungi responders were Aspergillus, Mortierella, and Phaeoacremonium by day 7, whereas Bullera and Basidiobolus dominated the fungal community at day 21. These results directly characterize the rapid response of microbial community to diesel spills, and suggest that the progression of diesel microbial degradation is performed by the cooperative system of the versatile obligate diesel-degrading and some general heterotrophic microorganisms in river diesel spills.
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10
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Liu Y, Chen S, Xie Z, Zhang L, Wang J, Fang J. Influence of Extremely High Pressure and Oxygen on Hydrocarbon-Enriched Microbial Communities in Sediments from the Challenger Deep, Mariana Trench. Microorganisms 2023; 11:microorganisms11030630. [PMID: 36985204 PMCID: PMC10052102 DOI: 10.3390/microorganisms11030630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/05/2023] Open
Abstract
Recent studies reported that highly abundant alkane content exists in the ~11,000 m sediment of the Mariana Trench, and a few key alkane-degrading bacteria were identified in the Mariana Trench. At present, most of the studies on microbes for degrading hydrocarbons were performed mainly at atmospheric pressure (0.1 MPa) and room temperature; little is known about which microbes could be enriched with the addition of n-alkanes under in-situ environmental pressure and temperature conditions in the hadal zone. In this study, we conducted microbial enrichments of sediment from the Mariana Trench with short-chain (SCAs, C7–C17) or long-chain (LCAs, C18–C36) n-alkanes and incubated them at 0.1 MPa/100 MPa and 4 °C under aerobic or anaerobic conditions for 150 days. Microbial diversity analysis showed that a higher microbial diversity was observed at 100 MPa than at 0.1 MPa, irrespective of whether SCAs or LCAs were added. Non-metric multidimensional scaling (nMDS) and hierarchical cluster analysis revealed that different microbial clusters were formed according to hydrostatic pressure and oxygen. Significantly different microbial communities were formed according to pressure or oxygen (p < 0.05). For example, Gammaproteobacteria (Thalassolituus) were the most abundant anaerobic n-alkanes-enriched microbes at 0.1 MPa, whereas the microbial communities shifted to dominance by Gammaproteobacteria (Idiomarina, Halomonas, and Methylophaga) and Bacteroidetes (Arenibacter) at 100 MPa. Compared to the anaerobic treatments, Actinobacteria (Microbacterium) and Alphaproteobacteria (Sulfitobacter and Phenylobacterium) were the most abundant groups with the addition of hydrocarbon under aerobic conditions at 100 MPa. Our results revealed that unique n-alkane-enriched microorganisms were present in the deepest sediment of the Mariana Trench, which may imply that extremely high hydrostatic pressure (100 MPa) and oxygen dramatically affected the processes of microbial-mediated alkane utilization.
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Affiliation(s)
- Ying Liu
- Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 200120, China
| | - Songze Chen
- Shenzhen Key Laboratory of Marine Archaea Geo-Omics, Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518000, China
| | - Zhe Xie
- Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 200120, China
| | - Li Zhang
- Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 200120, China
| | - Jiahua Wang
- Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 200120, China
- Correspondence: (J.W.); (J.F.)
| | - Jiasong Fang
- Shanghai Engineering Research Center of Hadal Science and Technology, Shanghai Ocean University, Shanghai 200120, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China
- Department of Natural Sciences, Hawaii Pacific University, Honolulu, HI 96813, USA
- Correspondence: (J.W.); (J.F.)
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11
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Brock ML, Richardson R, Ederington-Hagy M, Nigro L, Snyder RA, Jeffrey WH. Temporal variability of microbial response to crude oil exposure in the northern Gulf of Mexico. Front Ecol Evol 2023. [DOI: 10.3389/fevo.2023.1096880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Oil spills are common occurrences in the United States and can result in extensive ecological damage. The 2010 Deepwater Horizon oil spill in the Gulf of Mexico was the largest accidental spill recorded. Many studies were performed in deep water habitats to understand the microbial response to the released crude oil. However, much less is known about how planktonic coastal communities respond to oil spills and whether that response might vary over the course of the year. Understanding this temporal variability would lend additional insight into how coastal Florida habitats may have responded to the Deepwater Horizon oil spill. To assess this, the temporal response of planktonic coastal microbial communities to acute crude oil exposure was examined from September 2015 to September 2016 using seawater samples collected from Pensacola Beach, Florida, at 2-week intervals. A standard oil exposure protocol was performed using water accommodated fractions made from MC252 surrogate oil under photo-oxidizing conditions. Dose response curves for bacterial production and primary production were constructed from 3H-leucine incorporation and 14C-bicarbonate fixation, respectively. To assess drivers of temporal patterns in inhibition, a suite of biological and environmental parameters was measured including bacterial counts, chlorophyll a, temperature, salinity, and nutrients. Additionally, 16S rRNA sequencing was performed on unamended seawater to determine if temporal variation in the in situ bacterial community contributed to differences in inhibition. We observed that there is temporal variation in the inhibition of primary and bacterial production due to acute crude oil exposure. We also identified significant relationships of inhibition with environmental and biological parameters that quantitatively demonstrated that exposure to water-soluble crude oil constituents was most detrimental to planktonic microbial communities when temperature was high, when there were low inputs of total Kjeldahl nitrogen, and when there was low bacterial diversity or low phytoplankton biomass.
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12
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Abufalgha AA, Curson ARJ, Lea-Smith DJ, Pott RWM. The effect of Alcanivorax borkumensis SK2, a hydrocarbon-metabolising organism, on gas holdup in a 4-phase bubble column bioprocess. Bioprocess Biosyst Eng 2023; 46:635-644. [PMID: 36757455 DOI: 10.1007/s00449-023-02849-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 01/21/2023] [Indexed: 02/10/2023]
Abstract
To design bioprocesses utilising hydrocarbon-metabolising organisms (HMO) as biocatalysts, the effect of the organism on the hydrodynamics of bubble column reactor (BCR), such as gas holdup, needs to be investigated. Therefore, this study investigates the first use of an HMO, Alcanivorax borkumensis SK2, as a solid phase in the operation and hydrodynamics of a BCR. The study investigated the gas holdup in 3-phase and 4-phase systems in a BCR under ranges of superficial gas velocities (UG) from 1 to 3 cm/s, hydrocarbon (chain length C13-21) concentrations (HC) of 0, 5, and 10% v/v and microbial concentrations (MC) of 0, 0.35, 0.6 g/l. The results indicated that UG was the most significant parameter, as gas holdup increases linearly with increasing UG from 1 to 3 cm/s. Furthermore, the addition of hydrocarbons into the air-deionized water -SK2 system showed the highest increase in the gas holdup, particularly at high UG (above 2 cm/s). The solids (yeast, cornflour, and SK2) phases had differing effects on gas holdup, potentially due to the difference in surface activity. In this work, SK2 addition caused a reduction in the fluid surface tension in the bioprocess which therefore resulted in an increase in the gas holdup in BCR. This work builds upon previous investigations in optimising the hydrodynamics for bubble column hydrocarbon bioprocesses for the application of alkane bioactivation.
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Affiliation(s)
- Ayman A Abufalgha
- Department of Process Engineering, Stellenbosch University, Banghoek Road, Stellenbosch, 7600, South Africa.,School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.,DST-NRF Centre of Excellence in Catalysis (C* Change), Rondebosch, South Africa
| | - Andrew R J Curson
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.,DST-NRF Centre of Excellence in Catalysis (C* Change), Rondebosch, South Africa
| | - David J Lea-Smith
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.,DST-NRF Centre of Excellence in Catalysis (C* Change), Rondebosch, South Africa
| | - Robert W M Pott
- Department of Process Engineering, Stellenbosch University, Banghoek Road, Stellenbosch, 7600, South Africa. .,DST-NRF Centre of Excellence in Catalysis (C* Change), Rondebosch, South Africa.
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13
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Dynamics and prevalence of specific hydrocarbonoclastic bacterial population with respect to nutrient treatment levels in crude oil sludge. Arch Microbiol 2022; 204:708. [DOI: 10.1007/s00203-022-03323-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/09/2022] [Accepted: 11/07/2022] [Indexed: 11/16/2022]
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14
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Zhou Y, Kong Q, Zhao X, Lin Z, Zhang H. Dynamic changes in the microbial community in the surface seawater of Jiaozhou Bay after crude oil spills: An in situ microcosm study. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 307:119496. [PMID: 35594998 DOI: 10.1016/j.envpol.2022.119496] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 05/07/2022] [Accepted: 05/15/2022] [Indexed: 06/15/2023]
Abstract
The changes in the composition and structure of microbial communities in Jiaozhou Bay are strongly affected by marine oil pollution, but the outcomes of the microbial responses and effects of dispersant application remain unclear. Herein, we performed an in situ microcosm study to investigate the response of the indigenous microbial community under crude oil alone and combined oil and dispersant treatment in the surface seawater of a semi-enclosed marine area of Jiaozhou Bay. The dynamics of the bacterial classification based on 16s rDNA sequencing were used to assess the changes with the crude oil concentration, dispersant use, and time. The crude oil resulted in a high abundance of the genera Pseudohongiella, Cycloclasticus, Marivita, and C1-B045 from the Gammaproteobacteria and Alphaproteobacteria classes, suggesting for hydrocarbon degradation. However, the dispersant treatment was more advantageous for Pacificibacter, Marivita, and Loktanella. Besides accelerating the rate of bacterial community succession, the dispersants had significantly stronger effects on the structure of the bacterial community and the degradation functions than the oil. A higher dose of oil exposure corresponded to fewer dominant species with a high relative abundance. Our study provides information for screening potential degradation bacteria and assessing the risks that oil spills pose to marine ecosystems.
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Affiliation(s)
- Yumiao Zhou
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China
| | - Qiang Kong
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China
| | - Xinyu Zhao
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, China
| | - Zhihao Lin
- College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, China
| | - Huanxin Zhang
- College of Geography and Environment, Shandong Normal University, Jinan, 250000, China.
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15
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Wang Q, Guo S, Ali M, Song X, Tang Z, Zhang Z, Zhang M, Luo Y. Thermally enhanced bioremediation: A review of the fundamentals and applications in soil and groundwater remediation. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128749. [PMID: 35364527 DOI: 10.1016/j.jhazmat.2022.128749] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/11/2022] [Accepted: 03/18/2022] [Indexed: 06/14/2023]
Abstract
Thermally enhanced bioremediation (TEB), a new concept proposed in recent years, explores the combination of thermal treatment and bioremediation to address the challenges of the low efficiency and long duration of bioremediation. This study presented a comprehensive review regarding the fundamentals of TEB and its applications in soil and groundwater remediation. The temperature effects on the bioremediation of contaminants were systematically reviewed. The thermal effects on the physical, chemical and biological characteristics of soil, and the corresponding changes of contaminants bioavailability and microbial metabolic activities were summarized. Specifically, the increase in temperature within a suitable range can proliferate enzymes enrichment, extracellular polysaccharides and biosurfactants production, and further enhancing bioremediation. Furthermore, a systematic evaluation of TEB applications by utilizing traditional in situ heating technologies, as well as renewable energy (e.g., stored aquifer thermal energy and solar energy), was provided. Additionally, TEB has been applied as a biological polishing technology post thermal treatment, which can be a cost-effective method to address the contaminants rebounds in groundwater remediation. However, there are still various challenges to be addressed in TEB, and future research perspectives to further improve the basic understanding and applications of TEB for the remediation of contaminated soil and groundwater are presented.
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Affiliation(s)
- Qing Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Siwei Guo
- Zhejiang University, Hangzhou, China
| | - Mukhtiar Ali
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xin Song
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhiwen Tang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhuanxia Zhang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Meng Zhang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yongming Luo
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
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16
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Zhang W, Liang Y, Zheng K, Gu C, Liu Y, Wang Z, Zhang X, Shao H, Jiang Y, Guo C, He H, Wang H, Sung YY, Mok WJ, Zhang Y, McMinn A, Wang M. Characterization and genomic analysis of the first Oceanospirillum phage, vB_OliS_GJ44, representing a novel siphoviral cluster. BMC Genomics 2021; 22:675. [PMID: 34544379 PMCID: PMC8451122 DOI: 10.1186/s12864-021-07978-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 08/31/2021] [Indexed: 01/18/2023] Open
Abstract
Background Marine bacteriophages play key roles in the community structure of microorganisms, biogeochemical cycles, and the mediation of genetic diversity through horizontal gene transfer. Recently, traditional isolation methods, complemented by high-throughput sequencing metagenomics technology, have greatly increased our understanding of the diversity of bacteriophages. Oceanospirillum, within the order Oceanospirillales, are important symbiotic marine bacteria associated with hydrocarbon degradation and algal blooms, especially in polar regions. However, until now there has been no isolate of an Oceanospirillum bacteriophage, and so details of their metagenome has remained unknown. Results Here, we reported the first Oceanospirillum phage, vB_OliS_GJ44, which was assembled into a 33,786 bp linear dsDNA genome, which includes abundant tail-related and recombinant proteins. The recombinant module was highly adapted to the host, according to the tetranucleotides correlations. Genomic and morphological analyses identified vB_OliS_GJ44 as a siphovirus, however, due to the distant evolutionary relationship with any other known siphovirus, it is proposed that this virus could be classified as the type phage of a new Oceanospirivirus genus within the Siphoviridae family. vB_OliS_GJ44 showed synteny with six uncultured phages, which supports its representation in uncultured environmental viral contigs from metagenomics. Homologs of several vB_OliS_GJ44 genes have mostly been found in marine metagenomes, suggesting the prevalence of this phage genus in the oceans. Conclusions These results describe the first Oceanospirillum phage, vB_OliS_GJ44, that represents a novel viral cluster and exhibits interesting genetic features related to phage–host interactions and evolution. Thus, we propose a new viral genus Oceanospirivirus within the Siphoviridae family to reconcile this cluster, with vB_OliS_GJ44 as a representative member. Supplementary Information The online version contains supplementary material available at 10.1186/s12864-021-07978-4.
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Affiliation(s)
- Wenjing Zhang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Yantao Liang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China. .,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China.
| | - Kaiyang Zheng
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Chengxiang Gu
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Yundan Liu
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Ziyue Wang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Xinran Zhang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China
| | - Hongbing Shao
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China
| | - Yong Jiang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China
| | - Cui Guo
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China
| | - Hui He
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China
| | - Hualong Wang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China
| | - Yeong Yik Sung
- UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China.,Institute of Marine Biotechnology, Universiti Malaysia Terengganu (UMT), 21030, Kuala Nerus, Malaysia
| | - Wen Jye Mok
- UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China.,Institute of Marine Biotechnology, Universiti Malaysia Terengganu (UMT), 21030, Kuala Nerus, Malaysia
| | - Yuzhong Zhang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,Shangdong University, Qingdao, 266000, China
| | - Andrew McMinn
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.,Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, 7001, Australia
| | - Min Wang
- College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China. .,UMT-OUC Joint Centre for Marine Studies, Qingdao, 266003, China. .,The Affiliated Hospital of Qingdao University, Qingdao, 266000, China.
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17
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Mandal A, Dutta A, Das R, Mukherjee J. Role of intertidal microbial communities in carbon dioxide sequestration and pollutant removal: A review. MARINE POLLUTION BULLETIN 2021; 170:112626. [PMID: 34153859 DOI: 10.1016/j.marpolbul.2021.112626] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 06/06/2021] [Accepted: 06/08/2021] [Indexed: 05/16/2023]
Abstract
Intertidal microbial communities occur as biofilms or microphytobenthos (MPB) which are sediment-attached assemblages of bacteria, protozoa, fungi, algae, diatoms embedded in extracellular polymeric substances. Despite their global occurrence, they have not been reviewed in light of their structural and functional characteristics. This paper reviews the importance of such microbial communities and their importance in carbon dioxide sequestration as well as pollutant bioremediation. Global annual benthic microalgal productivity was 500 million tons of carbon, 50% of which contributed towards the autochthonous carbon fixation in the estuaries. Primary production by MPB was 27-234 gCm-2y-1 in the estuaries of Asia, Europe and the United States. Mechanisms of heavy metal removal remain to be tested in intertidal communities. Cyanobacteria facilitate hydrocarbon degradation in intertidal biofilms and microbial mats by supporting the associated sulfate-reducing bacteria and aerobic heterotrophs. Physiological cooperation between the microorganisms in intertidal communities imparts enhanced ability to utilize polycyclic aromatic hydrocarbon pollutants by these microorganisms than mono-species communities. Future research may be focused on biochemical characteristics of intertidal mats and biofilms, pollutant-microbial interactions and ecosystem influences.
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Affiliation(s)
- Abhishek Mandal
- School of Environmental Studies, Jadavpur University, 700032, India
| | - Ahana Dutta
- School of Environmental Studies, Jadavpur University, 700032, India
| | - Reshmi Das
- School of Environmental Studies, Jadavpur University, 700032, India.
| | - Joydeep Mukherjee
- School of Environmental Studies, Jadavpur University, 700032, India.
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18
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Thomas GE, Brant JL, Campo P, Clark DR, Coulon F, Gregson BH, McGenity TJ, McKew BA. Effects of Dispersants and Biosurfactants on Crude-Oil Biodegradation and Bacterial Community Succession. Microorganisms 2021; 9:microorganisms9061200. [PMID: 34206054 PMCID: PMC8229435 DOI: 10.3390/microorganisms9061200] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/27/2021] [Accepted: 05/27/2021] [Indexed: 02/06/2023] Open
Abstract
This study evaluated the effects of three commercial dispersants (Finasol OSR 52, Slickgone NS, Superdispersant 25) and three biosurfactants (rhamnolipid, trehalolipid, sophorolipid) in crude-oil seawater microcosms. We analysed the crucial early bacterial response (1 and 3 days). In contrast, most analyses miss this key period and instead focus on later time points after oil and dispersant addition. By focusing on the early stage, we show that dispersants and biosurfactants, which reduce the interfacial surface tension of oil and water, significantly increase the abundance of hydrocarbon-degrading bacteria, and the rate of hydrocarbon biodegradation, within 24 h. A succession of obligate hydrocarbonoclastic bacteria (OHCB), driven by metabolite niche partitioning, is demonstrated. Importantly, this succession has revealed how the OHCB Oleispira, hitherto considered to be a psychrophile, can dominate in the early stages of oil-spill response (1 and 3 days), outcompeting all other OHCB, at the relatively high temperature of 16 °C. Additionally, we demonstrate how some dispersants or biosurfactants can select for specific bacterial genera, especially the biosurfactant rhamnolipid, which appears to provide an advantageous compatibility with Pseudomonas, a genus in which some species synthesize rhamnolipid in the presence of hydrocarbons.
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Affiliation(s)
- Gareth E. Thomas
- School of Life Sciences, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK; (D.R.C.); (B.H.G.); (T.J.M.); (B.A.M.)
- Correspondence: ; Tel.: +44-1206-873333 (ext. 2918)
| | - Jan L. Brant
- Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK;
| | - Pablo Campo
- School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK; (P.C.); (F.C.)
| | - Dave R. Clark
- School of Life Sciences, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK; (D.R.C.); (B.H.G.); (T.J.M.); (B.A.M.)
- Institute for Analytics and Data Science, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK
| | - Frederic Coulon
- School of Water, Energy and Environment, Cranfield University, Cranfield MK43 0AL, UK; (P.C.); (F.C.)
| | - Benjamin H. Gregson
- School of Life Sciences, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK; (D.R.C.); (B.H.G.); (T.J.M.); (B.A.M.)
| | - Terry J. McGenity
- School of Life Sciences, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK; (D.R.C.); (B.H.G.); (T.J.M.); (B.A.M.)
| | - Boyd A. McKew
- School of Life Sciences, University of Essex, Wivenhoe Park, Essex CO4 3SQ, UK; (D.R.C.); (B.H.G.); (T.J.M.); (B.A.M.)
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19
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Bôto ML, Magalhães C, Perdigão R, Alexandrino DAM, Fernandes JP, Bernabeu AM, Ramos S, Carvalho MF, Semedo M, LaRoche J, Almeida CMR, Mucha AP. Harnessing the Potential of Native Microbial Communities for Bioremediation of Oil Spills in the Iberian Peninsula NW Coast. Front Microbiol 2021; 12:633659. [PMID: 33967978 PMCID: PMC8102992 DOI: 10.3389/fmicb.2021.633659] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 03/26/2021] [Indexed: 01/04/2023] Open
Abstract
Oil spills are among the most catastrophic events to marine ecosystems and current remediation techniques are not suitable for ecological restoration. Bioremediation approaches can take advantage of the activity of microorganisms with biodegradation capacity thus helping to accelerate the recovery of contaminated environments. The use of native microorganisms can increase the bioremediation efficiency since they have higher potential to survive in the natural environment while preventing unpredictable ecological impacts associated with the introduction of non-native organisms. In order to know the geographical scale to which a native bioremediation consortium can be applied, we need to understand the spatial heterogeneity of the natural microbial communities with potential for hydrocarbon degradation. In the present study, we aim to describe the genetic diversity and the potential of native microbial communities to degrade petroleum hydrocarbons, at an early stage of bioremediation, along the NW Iberian Peninsula coast, an area particularly susceptible to oil spills. Seawater samples collected in 47 sites were exposed to crude oil for 2 weeks, in enrichment experiments. Seawater samples collected in situ, and samples collected after the enrichment with crude oil, were characterized for prokaryotic communities by using 16S rRNA gene amplicon sequencing and predictive functional profiling. Results showed a drastic decrease in richness and diversity of microbial communities after the enrichment with crude oil. Enriched microbial communities were mainly dominated by genera known to degrade hydrocarbons, namely Alcanivorax, Pseudomonas, Acinetobacter, Rhodococcus, Flavobacterium, Oleibacter, Marinobacter, and Thalassospira, without significant differences between geographic areas and locations. Predictive functional profiling of the enriched microbial consortia showed a high potential to degrade the aromatic compounds aminobenzoate, benzoate, chlorocyclohexane, chlorobenzene, ethylbenzene, naphthalene, polycyclic aromatic compounds, styrene, toluene, and xylene. Only a few genera contributed for more than 50% of this genetic potential for aromatic compounds degradation in the enriched communities, namely Alcanivorax, Thalassospira, and Pseudomonas spp. This work is a starting point for the future development of prototype consortia of hydrocarbon-degrading bacteria to mitigate oil spills in the Iberian NW coast.
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Affiliation(s)
- Maria L Bôto
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Catarina Magalhães
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Faculty of Sciences (FCUP), University of Porto, Porto, Portugal.,Ocean Frontier Institute, Dalhousie University, Halifax, NS, Canada
| | - Rafaela Perdigão
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Diogo A M Alexandrino
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Joana P Fernandes
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Ana M Bernabeu
- Marine and Environmental Geology (GEOMA) Group, Department of Marine Geosciences, University of Vigo, Vigo, Spain
| | - Sandra Ramos
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal
| | - Maria F Carvalho
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Institute of Biomedical Sciences Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Miguel Semedo
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal
| | - Julie LaRoche
- Department of Biology, Dalhousie University, Halifax, NS, Canada
| | - C Marisa R Almeida
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Faculty of Sciences (FCUP), University of Porto, Porto, Portugal
| | - Ana P Mucha
- Bioremediation and Ecosystems Functioning (EcoBioTec), CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal.,Faculty of Sciences (FCUP), University of Porto, Porto, Portugal
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20
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Zhang W, Wang X, Li Y, Liu Z, Li D, Wen X, Feng Y, Zhang X. Pinewood Nematode Alters the Endophytic and Rhizospheric Microbial Communities of Pinus massoniana. MICROBIAL ECOLOGY 2021; 81:807-817. [PMID: 33051738 DOI: 10.1007/s00248-020-01619-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 10/08/2020] [Indexed: 05/17/2023]
Abstract
Pinewood nematode, Bursaphelenchus xylophilus, is one of the greatest threats to pine trees and is spreading all over the world. During the nematode's pathogenesis, plant microorganisms play important roles. However, many microbial communities, such as that in Pinus massoniana, a major host of B. xylophilus that is widely distributed in China, are not well studied, especially the fungal communities. Here, the endophytic and rhizospheric bacterial and fungal communities associated with healthy and B. xylophilus-infected P. massoniana were analyzed. The results showed that 7639 bacterial and 3108 fungal OTUs were annotated from samples of P. massoniana, the rhizosphere, and B. xylophilus. There were significant diversity differences of endophytic microbes between healthy and infected P. massoniana. The abundances of endophytic bacteria Paenibacillus, unidentified_Burkholderiaceae, Serratia, Erwinia, and Pseudoxanthomonas and fungi Penicillifer, Zygoascus, Kirschsteiniothelia, Cyberlindnera, and Sporothrix in infected pines were greater than those in healthy pines, suggesting an association of particular microbial abundances with the pathogenesis of B. xylophilus in pines. Meanwhile, the abundances of microbes of unidentified_Burkholderiaceae, Saitozyma, and Pestalotiopsis were greater and Acidothermus and Trichoderma were lower in the rhizosphere under infected pines than those under healthy pines and the differences might be caused by B. xylophilus-induced weakening of the health of pines. Our study explored the endophytic and rhizospheric microbial community changes potentially caused by B. xylophilus infection of pines.
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Affiliation(s)
- Wei Zhang
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Xuan Wang
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Yongxia Li
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China.
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China.
| | - Zhenkai Liu
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Dongzhen Li
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Xiaojian Wen
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Yuqian Feng
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
| | - Xingyao Zhang
- Lab. of Forest Pathogen Integrated Biology, Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, l00091, China
- Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China
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21
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Wang JD, Qu CT, Song SF. Temperature-induced changes in the proteome of Pseudomonas aeruginosa during petroleum hydrocarbon degradation. Arch Microbiol 2021; 203:2463-2473. [PMID: 33677632 DOI: 10.1007/s00203-021-02211-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/27/2020] [Accepted: 02/09/2021] [Indexed: 10/22/2022]
Abstract
Petroleum hydrocarbon contaminants, which are among the most serious pollutants in the petroleum industry, can be degraded sufficiently by Pseudomonas aeruginosa. However, temperature-induced stress will severely inhibit this biodegradation. In this study, the proteome of P. aeruginosa P6 at 25 °C, 43 °C and 37 °C was used to examine the impact of temperature on the molecular mechanism of biodegradation of petroleum hydrocarbon by P. aeruginosa P6. Differentially expressed proteins were identified by iTRAQ technology, and the functions of these proteins were identified by bioinformatic analysis. The impact of 25 °C and 43 °C on cellular processes has also been discussed. The results showed that the expression of proteins in chemotaxis toward petroleum hydrocarbons, terminal oxidation of aromatic rings in petroleum hydrocarbons and trans-membrane transport of fatty acids and nutriments were clearly inhibited under 25 °C condition. The expression of proteins in chemotaxis, emulsification, adhesion and terminal oxidation of petroleum hydrocarbons; catalysis of fatty alcohols and fatty aldehydes; trans-membrane transport of nutriments and β-oxidation were clearly inhibited under 43 °C condition.
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Affiliation(s)
- Jun-Di Wang
- College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, People's Republic of China. .,School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, People's Republic of China. .,Shaanxi Key Laboratory of Environmental Pollution Control Technology and Reservoir Protection of Oilfield, Xi'an Shiyou University, Xi'an, 710065, People's Republic of China. .,State Key Laboratory of Petroleum and Petrochemical Pollution Control and Treatment, Beijing, 102206, People's Republic of China.
| | - Cheng-Tun Qu
- College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, People's Republic of China.,Shaanxi Key Laboratory of Environmental Pollution Control Technology and Reservoir Protection of Oilfield, Xi'an Shiyou University, Xi'an, 710065, People's Republic of China.,State Key Laboratory of Petroleum and Petrochemical Pollution Control and Treatment, Beijing, 102206, People's Republic of China
| | - Shao-Fu Song
- College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, People's Republic of China.,Shaanxi Key Laboratory of Environmental Pollution Control Technology and Reservoir Protection of Oilfield, Xi'an Shiyou University, Xi'an, 710065, People's Republic of China.,State Key Laboratory of Petroleum and Petrochemical Pollution Control and Treatment, Beijing, 102206, People's Republic of China
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22
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Kearney SM, Thomas E, Coe A, Chisholm SW. Microbial diversity of co-occurring heterotrophs in cultures of marine picocyanobacteria. ENVIRONMENTAL MICROBIOME 2021; 16:1. [PMID: 33902739 PMCID: PMC8067657 DOI: 10.1186/s40793-020-00370-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 11/28/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND The cyanobacteria Prochlorococcus and Synechococcus are responsible for around 10% of global net primary productivity, serving as part of the foundation of marine food webs. Heterotrophic bacteria are often co-isolated with these picocyanobacteria in seawater enrichment cultures that contain no added organic carbon; heterotrophs grow on organic carbon supplied by the photolithoautotrophs. For examining the selective pressures shaping autotroph/heterotroph interactions, we have made use of unialgal enrichment cultures of Prochlorococcus and Synechococcus maintained for hundreds to thousands of generations in the lab. We examine the diversity of heterotrophs in 74 enrichment cultures of these picocyanobacteria obtained from diverse areas of the global oceans. RESULTS Heterotroph community composition differed between clades and ecotypes of the autotrophic 'hosts' but there was significant overlap in heterotroph community composition across these cultures. Collectively, the cultures were comprised of many shared taxa, even at the genus level. Yet, observed differences in community composition were associated with time since isolation, location, depth, and methods of isolation. The majority of heterotrophs in the cultures are rare in the global ocean, but enrichment conditions favor the opportunistic outgrowth of these rare bacteria. However, we found a few examples, such as bacteria in the family Rhodobacteraceae, of heterotrophs that were ubiquitous and abundant in cultures and in the global oceans. We found their abundance in the wild is also positively correlated with that of picocyanobacteria. CONCLUSIONS Particular conditions surrounding isolation have a persistent effect on long-term culture composition, likely from bottlenecking and selection that happen during the early stages of enrichment for the picocyanobacteria. We highlight the potential for examining ecologically relevant relationships by identifying patterns of distribution of culture-enriched organisms in the global oceans.
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Affiliation(s)
- Sean M. Kearney
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 15 Vassar St, Cambridge, MA 02139 USA
| | - Elaina Thomas
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 15 Vassar St, Cambridge, MA 02139 USA
| | - Allison Coe
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 15 Vassar St, Cambridge, MA 02139 USA
| | - Sallie W. Chisholm
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 15 Vassar St, Cambridge, MA 02139 USA
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23
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Denaro R, Aulenta F, Crisafi F, Di Pippo F, Cruz Viggi C, Matturro B, Tomei P, Smedile F, Martinelli A, Di Lisio V, Venezia C, Rossetti S. Marine hydrocarbon-degrading bacteria breakdown poly(ethylene terephthalate) (PET). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 749:141608. [PMID: 32836129 DOI: 10.1016/j.scitotenv.2020.141608] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/07/2020] [Accepted: 08/08/2020] [Indexed: 05/09/2023]
Abstract
Pollution of aquatic ecosystems by plastic wastes poses severe environmental and health problems and has prompted scientific investigations on the fate and factors contributing to the modification of plastics in the marine environment. Here, we investigated, by means of microcosm studies, the role of hydrocarbon-degrading bacteria in the degradation of poly(ethylene terephthalate) (PET), the main constituents of plastic bottles, in the marine environment. To this aim, different bacterial consortia, previously acclimated to representative hydrocarbons fractions namely, tetradecane (aliphatic fraction), diesel (mixture of hydrocarbons), and naphthalene/phenantrene (aromatic fraction), were used as inocula of microcosm experiments, in order to identify peculiar specialization in poly(ethylene terephthalate) degradation. Upon formation of a mature biofilm on the surface of poly(ethylene terephthalate) films, the bacterial biodiversity and degradation efficiency of each selected consortium was analyzed. Notably, significant differences on biofilm biodiversity were observed with distinctive hydrocarbons-degraders being enriched on poly(ethylene terephthalate) surface, such as Alcanivorax, Hyphomonas, and Cycloclasticus species. Interestingly, ATR-FTIR analyses, supported by SEM and water contact angle measurements, revealed major alterations of the surface chemistry and morphology of PET films, mainly driven by the bacterial consortia enriched on tetradecane and diesel. Distinctive signatures of microbial activity were the alteration of the FTIR spectra as a consequence of PET chain scission through the hydrolysis of the ester bond, the increased sample hydrophobicity as well as the formation of small cracks and cavities on the surface of the film. In conclusion, our study demonstrates for the first time that hydrocarbons-degrading marine bacteria have the potential to degrade poly(ethylene terephthalate), although their degradative activity could potentially trigger the formation of harmful microplastics in the marine environment.
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Affiliation(s)
- R Denaro
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy.
| | - F Aulenta
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - F Crisafi
- Institute for Biological Resources and Marine Biotechnology (IRBIM) (CNR), Spianata San Raineri, 86, 98121 Messina, Italy
| | - F Di Pippo
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - C Cruz Viggi
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - B Matturro
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - P Tomei
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - F Smedile
- Institute for Biological Resources and Marine Biotechnology (IRBIM) (CNR), Spianata San Raineri, 86, 98121 Messina, Italy
| | - A Martinelli
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
| | - V Di Lisio
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
| | - C Venezia
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
| | - S Rossetti
- Water Research Institute (IRSA) (CNR), Via Salaria km 29, 300, 00015 Monterotondo, Rome, Italy
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24
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Chernikova TN, Bargiela R, Toshchakov SV, Shivaraman V, Lunev EA, Yakimov MM, Thomas DN, Golyshin PN. Hydrocarbon-Degrading Bacteria Alcanivorax and Marinobacter Associated With Microalgae Pavlova lutheri and Nannochloropsis oculata. Front Microbiol 2020; 11:572931. [PMID: 33193176 PMCID: PMC7655873 DOI: 10.3389/fmicb.2020.572931] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 10/01/2020] [Indexed: 12/26/2022] Open
Abstract
Marine hydrocarbon-degrading bacteria play an important role in natural petroleum biodegradation processes and were initially associated with man-made oil spills or natural seeps. There is no full clarity though on what, in the absence of petroleum, their natural niches are. Few studies pointed at some marine microalgae that produce oleophilic compounds (alkanes, long-chain fatty acids, and alcohols) as potential natural hosts of these bacteria. We established Dansk crude oil-based enrichment cultures with photobioreactor-grown marine microalgae cultures Pavlova lutheri and Nannochloropsis oculata and analyzed the microbial succession using cultivation and SSU (16S) rRNA amplicon sequencing. We found that petroleum enforced a strong selection for members of Alpha- and Gamma-proteobacteria in both enrichment cultures with the prevalence of Alcanivorax and Marinobacter spp., well-known hydrocarbonoclastic bacteria. In total, 48 non-redundant bacterial strains were isolated and identified to represent genera Alcanivorax, Marinobacter, Thalassospira, Hyphomonas, Halomonas, Marinovum, Roseovarius, and Oleibacter, which were abundant in sequencing reads in both crude oil enrichments. Our assessment of public databases demonstrated some overlaps of geographical sites of isolation of Nannochloropsis and Pavlova with places of molecular detection and isolation of Alcanivorax and Marinobacter spp. Our study suggests that these globally important hydrocarbon-degrading bacteria are associated with P. lutheri and N. oculata.
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Affiliation(s)
- Tatyana N Chernikova
- School of Natural Sciences, Bangor University, Bangor, United Kingdom.,CEB-Centre for Environmental Biotechnology, Bangor University, Bangor, United Kingdom
| | - Rafael Bargiela
- School of Natural Sciences, Bangor University, Bangor, United Kingdom
| | | | | | - Evgenii A Lunev
- Institute of Living Systems, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Michail M Yakimov
- Institute for Marine Biological Resources and Biotechnology of the National Research Council, IRBIM-CNR, Messina, Italy
| | - David N Thomas
- School of Ocean Sciences, Bangor University, Menai Bridge, United Kingdom
| | - Peter N Golyshin
- School of Natural Sciences, Bangor University, Bangor, United Kingdom.,CEB-Centre for Environmental Biotechnology, Bangor University, Bangor, United Kingdom
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25
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The Interactive Effects of Crude Oil and Corexit 9500 on Their Biodegradation in Arctic Seawater. Appl Environ Microbiol 2020; 86:AEM.01194-20. [PMID: 32826215 PMCID: PMC7580538 DOI: 10.1128/aem.01194-20] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 08/10/2020] [Indexed: 11/20/2022] Open
Abstract
Chemical dispersants such as Corexit 9500 are commonly used in oil spill response and are currently under consideration for use in the Arctic, where their fate and effects have not been well studied. This research was performed to determine the interactive effects of the copresence of crude oil and Corexit 9500 on the degradation of components from each mixture and the associated microbial community structure over time in Arctic seawater. These findings will help yield a better understanding of the biodegradability of dispersant components applied to an oil spill, the temporal microbial community response to dispersed oil, and the fundamental microbial ecology of organic contaminant biodegradation processes in the Arctic marine environment. The risk of petroleum spills coupled with the potential application of chemical dispersants as a spill response strategy necessitates further understanding of the fate of oil and dispersants and their interactive effects during biodegradation. Using Arctic seawater mesocosms amended with either crude oil, Corexit 9500, or both together, we quantified the chemical losses of crude oil and Corexit 9500 and identified microbial taxa implicated in their biodegradation based on shifts in the microbial community structure over a 30-day time course. Chemical analyses included total petroleum hydrocarbons (TPH), n-alkanes, branched alkanes, and polycyclic aromatic hydrocarbons (PAHs) for oil loss and the surfactant components dioctyl sodium sulfosuccinate (DOSS), Span 80, Tween 80, Tween 85, and the DOSS metabolite ethylhexyl sulfosuccinate (EHSS) for Corexit loss. Changes to the microbial communities and identification of key taxa were determined by 16S rRNA gene amplicon sequencing. The nonionic surfactants of Corexit 9500 (Span 80 and Tweens 80 and 85) biodegraded rapidly, dropping to below the limits of detection within 5 days and prior to any detectable initiation of oil biodegradation. This resulted in no observable suppression of petroleum biodegradation in the presence of Corexit compared to that of oil alone. In contrast, biodegradation of DOSS was delayed in the presence of oil, based on the prolonged presence of DOSS and accumulation of the degradation intermediate EHSS that did not occur in the absence of oil. Microbial analyses revealed that oil and Corexit enriched different overall microbial communities, with the presence of both resulting in a community composition that shifted from one more similar to that of Corexit only to one reflecting the oil-only community over time, in parallel with the degradation of predominantly Corexit and then oil components. Some microbial taxa (Oleispira, Pseudofulvibacter, and Roseobacter) responded to either oil or Corexit, suggesting that some organisms may be capable of utilizing both substrates. Together, these findings reveal interactive effects of crude oil and Corexit 9500 on chemical losses and microbial communities as they biodegrade, providing further insight into their fate when copresent in the environment. IMPORTANCE Chemical dispersants such as Corexit 9500 are commonly used in oil spill response and are currently under consideration for use in the Arctic, where their fate and effects have not been well studied. This research was performed to determine the interactive effects of the copresence of crude oil and Corexit 9500 on the degradation of components from each mixture and the associated microbial community structure over time in Arctic seawater. These findings will help yield a better understanding of the biodegradability of dispersant components applied to an oil spill, the temporal microbial community response to dispersed oil, and the fundamental microbial ecology of organic contaminant biodegradation processes in the Arctic marine environment.
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26
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Hamdan HZ, Salam DA. Microbial community evolution during the aerobic biodegradation of petroleum hydrocarbons in marine sediment microcosms: Effect of biostimulation and seasonal variations. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:114858. [PMID: 32497947 DOI: 10.1016/j.envpol.2020.114858] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 05/16/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
Evolution of the microbial community structure in crude oil contaminated marine sediments was assessed under aerobic biodegradation during wet (18 °C) and dry (28 °C) seasons experiments, to account for seasonal variations in nutrients and temperature, under biostimulation and natural attenuation conditions. NMDS showed significant variation in the microbial communities between the wet and the dry season experiments, and between the biostimulation and the natural attenuation treatments in the dry season microcosms. No significant variation in the microbial community and oil biodegradation was observed during the wet season experiments due to high background nitrogen levels eliminating the effect of biostimulation. Larger variations were observed in the dry season experiments and were correlated to enhanced alkanes removal in the biostimulated microcosms, where Alphaproteobacteria dominated the total microbial community by the end of biodegradation (54%). Many hydrocarbonoclastic bacterial genera showed successive dominance during the operation affecting the ultimate performance of the microcosms.
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Affiliation(s)
- Hamdan Z Hamdan
- Department of Civil and Environmental Engineering, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Beirut, Lebanon
| | - Darine A Salam
- Department of Civil and Environmental Engineering, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Beirut, Lebanon.
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27
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Thomas GE, Cameron TC, Campo P, Clark DR, Coulon F, Gregson BH, Hepburn LJ, McGenity TJ, Miliou A, Whitby C, McKew BA. Bacterial Community Legacy Effects Following the Agia Zoni II Oil-Spill, Greece. Front Microbiol 2020; 11:1706. [PMID: 32765479 PMCID: PMC7379155 DOI: 10.3389/fmicb.2020.01706] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 06/29/2020] [Indexed: 01/08/2023] Open
Abstract
In September 2017 the Agia Zoni II sank in the Saronic Gulf, Greece, releasing approximately 500 tonnes of heavy fuel oil, contaminating the Salamina and Athens coastlines. Effects of the spill, and remediation efforts, on sediment microbial communities were quantified over the following 7 months. Five days post-spill, the concentration of measured hydrocarbons within surface sediments of contaminated beaches was 1,093-3,773 μg g-1 dry sediment (91% alkanes and 9% polycyclic aromatic hydrocarbons), but measured hydrocarbons decreased rapidly after extensive clean-up operations. Bacterial genera known to contain oil-degrading species increased in abundance, including Alcanivorax, Cycloclasticus, Oleibacter, Oleiphilus, and Thalassolituus, and the species Marinobacter hydrocarbonoclasticus from approximately 0.02 to >32% (collectively) of the total bacterial community. Abundance of genera with known hydrocarbon-degraders then decreased 1 month after clean-up. However, a legacy effect was observed within the bacterial community, whereby Alcanivorax and Cycloclasticus persisted for several months after the oil spill in formerly contaminated sites. This study is the first to evaluate the effect of the Agia Zoni II oil-spill on microbial communities in an oligotrophic sea, where in situ oil-spill studies are rare. The results aid the advancement of post-spill monitoring models, which can predict the capability of environments to naturally attenuate oil.
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Affiliation(s)
- Gareth E. Thomas
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Tom C. Cameron
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Pablo Campo
- School of Water, Energy and Environment, Cranfield University, Cranfield, United Kingdom
| | - Dave R. Clark
- School of Life Sciences, University of Essex, Colchester, United Kingdom
- Institute for Analytics and Data Science, University of Essex, Wivenhoe Park, Essex, United Kingdom
| | - Frederic Coulon
- School of Water, Energy and Environment, Cranfield University, Cranfield, United Kingdom
| | | | - Leanne J. Hepburn
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Terry J. McGenity
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | | | - Corinne Whitby
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Boyd A. McKew
- School of Life Sciences, University of Essex, Colchester, United Kingdom
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28
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Gregson BH, Metodieva G, Metodiev MV, Golyshin PN, McKew BA. Protein expression in the obligate hydrocarbon-degrading psychrophile Oleispira antarctica RB-8 during alkane degradation and cold tolerance. Environ Microbiol 2020; 22:1870-1883. [PMID: 32090431 PMCID: PMC7318663 DOI: 10.1111/1462-2920.14956] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 02/14/2020] [Accepted: 02/18/2020] [Indexed: 12/15/2022]
Abstract
In cold marine environments, the obligate hydrocarbon‐degrading psychrophile Oleispira antarctica RB‐8, which utilizes aliphatic alkanes almost exclusively as substrates, dominates microbial communities following oil spills. In this study, LC–MS/MS shotgun proteomics was used to identify changes in the proteome induced during growth on n‐alkanes and in cold temperatures. Specifically, proteins with significantly higher relative abundance during growth on tetradecane (n‐C14) at 16°C and 4°C have been quantified. During growth on n‐C14, O. antarctica expressed a complete pathway for the terminal oxidation of n‐alkanes including two alkane monooxygenases, two alcohol dehydrogenases, two aldehyde dehydrogenases, a fatty‐acid‐CoA ligase, a fatty acid desaturase and associated oxidoreductases. Increased biosynthesis of these proteins ranged from 3‐ to 21‐fold compared with growth on a non‐hydrocarbon control. This study also highlights mechanisms O. antarctica may utilize to provide it with ecological competitiveness at low temperatures. This was evidenced by an increase in spectral counts for proteins involved in flagella structure/output to overcome higher viscosity, flagella rotation to accumulate cells and proline metabolism to counteract oxidative stress, during growth at 4°C compared with 16°C. Such species‐specific understanding of the physiology during hydrocarbon degradation can be important for parameterizing models that predict the fate of marine oil spills.
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Affiliation(s)
- Benjamin H Gregson
- School of Life Sciences, University of Essex, Colchester, Essex, CO4 3SQ, UK
| | - Gergana Metodieva
- School of Life Sciences, University of Essex, Colchester, Essex, CO4 3SQ, UK
| | - Metodi V Metodiev
- School of Life Sciences, University of Essex, Colchester, Essex, CO4 3SQ, UK
| | - Peter N Golyshin
- School of Natural Sciences, College of Environmental Sciences and Engineering, Bangor University, Bangor, UK.,Centre for Environmental Biotechnology, Bangor University, Deiniol Road, Bangor, LL57 2UW, UK
| | - Boyd A McKew
- School of Life Sciences, University of Essex, Colchester, Essex, CO4 3SQ, UK
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29
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Varrella S, Tangherlini M, Corinaldesi C. Deep Hypersaline Anoxic Basins as Untapped Reservoir of Polyextremophilic Prokaryotes of Biotechnological Interest. Mar Drugs 2020; 18:md18020091. [PMID: 32019162 PMCID: PMC7074082 DOI: 10.3390/md18020091] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/27/2020] [Accepted: 01/28/2020] [Indexed: 12/18/2022] Open
Abstract
Deep-sea hypersaline anoxic basins (DHABs) are considered to be among the most extreme ecosystems on our planet, allowing only the life of polyextremophilic organisms. DHABs’ prokaryotes exhibit extraordinary metabolic capabilities, representing a hot topic for microbiologists and biotechnologists. These are a source of enzymes and new secondary metabolites with valuable applications in different biotechnological fields. Here, we review the current knowledge on prokaryotic diversity in DHABs, highlighting the biotechnological applications of identified taxa and isolated species. The discovery of new species and molecules from these ecosystems is expanding our understanding of life limits and is expected to have a strong impact on biotechnological applications.
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Affiliation(s)
- Stefano Varrella
- Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, 60131 Ancona, Italy;
| | | | - Cinzia Corinaldesi
- Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, 60131 Ancona, Italy;
- Correspondence:
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30
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Shin B, Bociu I, Kolton M, Huettel M, Kostka JE. Succession of microbial populations and nitrogen-fixation associated with the biodegradation of sediment-oil-agglomerates buried in a Florida sandy beach. Sci Rep 2019; 9:19401. [PMID: 31852991 PMCID: PMC6920467 DOI: 10.1038/s41598-019-55625-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 12/02/2019] [Indexed: 01/06/2023] Open
Abstract
The Deepwater Horizon (DWH) oil spill contaminated coastlines from Louisiana to Florida, burying oil up to 70 cm depth in sandy beaches, posing a potential threat to environmental and human health. The dry and nutrient-poor beach sand presents a taxing environment for microbial growth, raising the question how the biodegradation of the buried oil would proceed. Here we report the results of an in-situ experiment that (i) characterized the dominant microbial communities contained in sediment oil agglomerates (SOAs) of DWH oil buried in a North Florida sandy beach, (ii) elucidated the long-term succession of the microbial populations that developed in the SOAs, and (iii) revealed the coupling of SOA degradation to nitrogen fixation. Orders of magnitude higher bacterial abundances in SOAs compared to surrounding sands distinguished SOAs as hotspots of microbial growth. Blooms of bacterial taxa with a demonstrated potential for hydrocarbon degradation (Gammaproteobacteria, Alphaproteobacteria, Actinobacteria) developed in the SOAs, initiating a succession of microbial populations that mirrored the evolution of the petroleum hydrocarbons. Growth of nitrogen-fixing prokaryotes or diazotrophs (Rhizobiales and Frankiales), reflected in increased abundances of nitrogenase genes (nifH), catalyzed biodegradation of the nitrogen-poor petroleum hydrocarbons, emphasizing nitrogen fixation as a central mechanism facilitating the recovery of sandy beaches after oil contamination.
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Affiliation(s)
- Boryoung Shin
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Ioana Bociu
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA
| | - Max Kolton
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Markus Huettel
- Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA
| | - Joel E Kostka
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA. .,School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA.
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31
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Krolicka A, Boccadoro C, Nilsen MM, Demir-Hilton E, Birch J, Preston C, Scholin C, Baussant T. Identification of microbial key-indicators of oil contamination at sea through tracking of oil biotransformation: An Arctic field and laboratory study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 696:133715. [PMID: 31470316 DOI: 10.1016/j.scitotenv.2019.133715] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/26/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
In this paper, a molecular analytical approach for detecting hydrocarbonoclastic bacteria in water is suggested as a proxy measurement for tracking petroleum discharges in industrialized or pristine aquatic environments. This approach is tested for general application in cold marine regions (freezing to 5 °C). We used amplicon sequencing and qPCR to quantify 16S rRNA and GyrB genes from oleophilic bacteria in seawater samples from two different crude oil enrichments. The first experiment was conducted in a controlled environment using laboratory conditions and natural North Sea fjord seawater (NSC) at a constant temperature of 5 °C. The second was performed in the field with natural Arctic seawater (ARC) and outdoor temperature conditions from -7 °C to around 4 °C. Although the experimental conditions for NSC and ARC differed, the temporal changes in bacterial communities were comparable and reflected oil biotransformation processes. The common bacterial OTUs for NSC and ARC had the highest identity to Colwellia rossensis and Oleispira antarctica rRNA sequences and were enriched within a few days in both conditions. Other typical oil degrading bacteria such as Alcanivorax (n-alkane degrader) and Cycloclasticus (polycyclic aromatic hydrocarbons degrader) were rapidly enriched only in NSC conditions. Both the strong correlation between Oleispira SSU gene copies and oil concentration, and the specificity of the Oleispira assay suggest that this organism is a robust bioindicator for seawater contaminated by petroleum in cold water environments. Further optimization for automation of the Oleispira assay for in situ analysis with a genosensing device is underway. The assay for Colwellia quantification requires more specificity to fewer Colwellia OTUs and a well-established dose-response relationship before those taxa are used for oil tracking purposes.
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Affiliation(s)
- Adriana Krolicka
- NORCE - Norwegian Research Centre - Environment, Mekjarvik 12, 4070 Randaberg, Norway.
| | - Catherine Boccadoro
- NORCE - Norwegian Research Centre - Environment, Mekjarvik 12, 4070 Randaberg, Norway
| | - Mari Mæland Nilsen
- NORCE - Norwegian Research Centre - Environment, Mekjarvik 12, 4070 Randaberg, Norway
| | - Elif Demir-Hilton
- Monterey Bay Aquarium Research Institute, Sandholdt Road, Moss Landing, CA, USA
| | - Jim Birch
- Monterey Bay Aquarium Research Institute, Sandholdt Road, Moss Landing, CA, USA
| | - Christina Preston
- Monterey Bay Aquarium Research Institute, Sandholdt Road, Moss Landing, CA, USA
| | - Chris Scholin
- Monterey Bay Aquarium Research Institute, Sandholdt Road, Moss Landing, CA, USA
| | - Thierry Baussant
- NORCE - Norwegian Research Centre - Environment, Mekjarvik 12, 4070 Randaberg, Norway
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Hernández-López EL, Gasperin J, Bernáldez-Sarabia J, Licea-Navarro AF, Guerrero A, Lizárraga-Partida ML. Detection of Alcanivorax spp., Cycloclasticus spp., and Methanomicrobiales in water column and sediment samples in the Gulf of Mexico by qPCR. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:35131-35139. [PMID: 31680200 PMCID: PMC6900280 DOI: 10.1007/s11356-019-06551-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Water column and sediment samples were collected in the southern Gulf of Mexico (GoMex) during 3 oceanographic cruises: XIXIMI-04 (September 2015), XIXIMI-05 (June 2016), and XIXIMI-06 (August 2017). DNA that was extracted from the samples was analyzed by qPCR to detect and quantify bacterial groups that have been reported to metabolize alkanes (Alcanivorax) and aromatic hydrocarbons (Cycloclasticus) and are involved in methane production (Methanomicrobiales). The results were then analyzed with regard to the water masses that are currently detected in the GoMex. Generally, we observed a decrease in the proportion of Alcanivorax and a rise in those of Cycloclasticus and Methanomicrobiales in samples from the surface to deep waters and in sediment samples. Scatterplots of the results showed that the relative abundance of the 3 groups was higher primarily from the surface to 1000 m, but the levels of Cycloclasticus and Methanomicrobiales were high in certain water samples below 1000 m and in sediments. In conclusion, oil-degrading bacteria are distributed widely from the surface to deep waters and sediments throughout the southern GoMex, representing a potential inoculum of bacteria for various hydrocarbon fractions that are ready for proliferation and degradation in the event of an oil spill from the seafloor or along the water column.
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Affiliation(s)
- Edna L Hernández-López
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México
| | - Jahaziel Gasperin
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México
| | - Johanna Bernáldez-Sarabia
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México
| | - Alexei F Licea-Navarro
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México
| | - Abraham Guerrero
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México
| | - Marcial Leonardo Lizárraga-Partida
- Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Ensenada-Tijuana 3918, zona Playitas, 22860, Ensenada, Baja California, México.
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Rizzo C, Malavenda R, Gerçe B, Papale M, Syldatk C, Hausmann R, Bruni V, Michaud L, Lo Giudice A, Amalfitano S. Effects of a Simulated Acute Oil Spillage on Bacterial Communities from Arctic and Antarctic Marine Sediments. Microorganisms 2019; 7:microorganisms7120632. [PMID: 31801240 PMCID: PMC6956123 DOI: 10.3390/microorganisms7120632] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/26/2019] [Accepted: 11/28/2019] [Indexed: 11/16/2022] Open
Abstract
Background: The bacterial community responses to oil spill events are key elements to predict the fate of hydrocarbon pollution in receiving aquatic environments. In polar systems, cold temperatures and low irradiance levels can limit the effectiveness of contamination removal processes. In this study, the effects of a simulated acute oil spillage on bacterial communities from polar sediments were investigated, by assessing the role of hydrocarbon mixture, incubation time and source bacterial community in selecting oil-degrading bacterial phylotypes. Methods: The bacterial hydrocarbon degradation was evaluated by gas chromatography. Flow cytometric and fingerprinting profiles were used to assess the bacterial community dynamics over the experimental incubation time. Results: Direct responses to the simulated oil spill event were found from both Arctic and Antarctic settings, with recurrent bacterial community traits and diversity profiles, especially in crude oil enrichment. Along with the dominance of Pseudomonas spp., members of the well-known hydrocarbon degraders Granulosicoccus spp. and Cycloclasticus spp. were retrieved from both sediments. Conclusions: Our findings indicated that polar bacterial populations are able to respond to the detrimental effects of simulated hydrocarbon pollution, by developing into a more specialized active oil degrading community.
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Affiliation(s)
- Carmen Rizzo
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (C.R.); (R.M.)
| | - Roberta Malavenda
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (C.R.); (R.M.)
| | - Berna Gerçe
- Institute of Process Engineering in Life Sciences, Section II: Technical Biology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany; (B.G.)
| | - Maria Papale
- Institute of Polar Sciences, National Research Council (CNR-ISP), 98122 Messina, Italy;
| | - Christoph Syldatk
- Institute of Process Engineering in Life Sciences, Section II: Technical Biology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany; (B.G.)
| | - Rudolf Hausmann
- Department of Bioprocess Engineering, Institute of Food Science and Biotechnology, University of Hohenheim, 70599 Stuttgart, Germany;
| | - Vivia Bruni
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (C.R.); (R.M.)
| | - Luigi Michaud
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (C.R.); (R.M.)
| | - Angelina Lo Giudice
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98166 Messina, Italy; (C.R.); (R.M.)
- Institute of Polar Sciences, National Research Council (CNR-ISP), 98122 Messina, Italy;
- Correspondence: ; Tel.: +00-3909-0601-5415
| | - Stefano Amalfitano
- Water Research Institute, National Research Council (CNR-IRSA), 00015 Rome, Italy;
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Khudur LS, Shahsavari E, Webster GT, Nugegoda D, Ball AS. The impact of lead co-contamination on ecotoxicity and the bacterial community during the bioremediation of total petroleum hydrocarbon-contaminated soils. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 253:939-948. [PMID: 31351302 DOI: 10.1016/j.envpol.2019.07.107] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/19/2019] [Accepted: 07/20/2019] [Indexed: 06/10/2023]
Abstract
The continued increase in the global demand for oil, which reached 4,488 Mtoe in 2018, leads to large quantities of petroleum products entering the environment posing serious risks to natural ecosystems if left untreated. In this study, we evaluated the impact of co-contamination with lead on the efficacy of two bioremediation processes, natural attenuation and biostimulation of Total Petroleum Hydrocarbons (TPH) as well as the associated toxicity and the changes in the microbial community in contaminated soils. The biostimulated treatment resulted in 96% and 84% reduction in TPH concentration in a single and a co-contamination scenario, respectively, over 28 weeks of a mesocosm study. This reduction was significantly more in comparison to natural attenuation in a single and a co-contamination scenario, which was 56% and 59% respectively. In contrast, a significantly greater reduction in the associated toxicity of in soils undergoing natural attenuation was evident compared with soils undergoing biostimulation despite the lower TPH degradation when bioassays were applied. The earthworm toxicity test showed a decrease of 72% in the naturally attenuated toxicity versus only 62% in the biostimulated treatment of a single contamination scenario. In a co-contamination scenario, toxicity decreased only 30% and 8% after natural attenuation and biostimulation treatments, respectively. 16s rDNA sequence analysis was used to assess the impact of both the co-contamination and the bioremediation treatment. NGS data revealed major bacterial domination by Nocardioides spp., which reached 40% in week 20 of the natural attenuation treatment. In the biostimulated soil samples, more than 50% of the bacterial community was dominated by Alcanivorax spp. in week 12. The presence of Pb in the natural attenuation treatment resulted in an increased abundance of a few Pb-resistant genera such as Sphingopyxis spp. and Thermomonas spp in addition to Nocardioides spp. In contrast, Pb co-contamination completely shifted the bacterial pattern in the stimulated treatment with Pseudomonas spp. comprising approximately 45% of the bacterial profile in week 12. This study confirms the effectiveness of biostimulation over natural attenuation in remediating TPH and TPH-Pb contaminated soils. In addition, the presence of co-contaminants (e.g. Pb) results in serious impacts on the efficacy of bioremediation of TPH in contaminated soils, which must be considered prior to designing any bioremediation strategy.
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Affiliation(s)
- Leadin S Khudur
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, 3083, Australia.
| | - Esmaeil Shahsavari
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, 3083, Australia
| | - Grant T Webster
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, 3083, Australia
| | - Dayanthi Nugegoda
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, 3083, Australia
| | - Andrew S Ball
- Centre for Environmental Sustainability and Remediation, School of Science, RMIT University, Bundoora, VIC, 3083, Australia
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35
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Mehetre GT, Dastager SG, Dharne MS. Biodegradation of mixed polycyclic aromatic hydrocarbons by pure and mixed cultures of biosurfactant producing thermophilic and thermo-tolerant bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 679:52-60. [PMID: 31082602 DOI: 10.1016/j.scitotenv.2019.04.376] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 04/06/2019] [Accepted: 04/25/2019] [Indexed: 06/09/2023]
Abstract
Applicability of thermophilic and thermo-tolerant microorganisms for biodegradation of polycyclic aromatic hydrocarbons (PAHs) with low water solubility is an interesting strategy for improving the biodegradation efficiency. In this study, we evaluated utility of thermophilic and thermo-tolerant bacteria isolated from Unkeshwar hot spring (India) for biodegradation of four different PAHs. Water samples were enriched in mineral salt medium (MSM) containing a mixture of four PAHs compounds (anthracene: ANT, fluorene: FLU, phenanthrene: PHE and pyrene: PYR) at 37 °C and 50 °C. After growth based screening, four potent strains obtained which were identified as Aeribacillus pallidus (UCPS2), Bacillus axarquiensis (UCPD1), Bacillus siamensis (GHP76) and Bacillus subtilis subsp. inaquosorum (U277) based on the 16S rRNA gene sequence analysis. Degradation of mixed PAH compounds was evaluated by pure as well as mixed cultures under shake flask conditions using MSM supplemented with 200 mg/L concentration of PAHs (50 mg/L of each compound) for 15 days at 37 °C and 50 °C. A relatively higher degradation of ANT (92%- 96%), FLU (83% - 86%), PHE (16% - 54%) and PYR (51% - 71%) was achieved at 50 °C by Aeribacillus sp. (UCPS2) and mixed culture. Furthermore, crude oil was used as a substrate to study the degradation of same PAHs using these organisms which also revealed with similar results with the higher degradation at 50 °C. Interestingly, PAH-degrading strains were also positive for biosurfactant production. Biosurfactants were identified as the variants of surfactins (lipopeptide biosurfactants) based on analytical tools and phylogenetic analysis of the surfactin genes. Overall, this study has shown that hot spring microbes may have a potential for PAHs degradation and also biosurfactant production at a higher temperature, which could provide a novel perspective for removal of PAHs residues from oil contaminated sites.
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Affiliation(s)
- Gajanan T Mehetre
- National Collection of Industrial Microorganisms (NCIM), CSIR-National Chemical Laboratory, Pune, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Syed G Dastager
- National Collection of Industrial Microorganisms (NCIM), CSIR-National Chemical Laboratory, Pune, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Mahesh S Dharne
- National Collection of Industrial Microorganisms (NCIM), CSIR-National Chemical Laboratory, Pune, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi, India.
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36
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Hydrocarbon-Degrading Microbial Communities Are Site Specific, and Their Activity Is Limited by Synergies in Temperature and Nutrient Availability in Surface Ocean Waters. Appl Environ Microbiol 2019; 85:AEM.00443-19. [PMID: 31126938 DOI: 10.1128/aem.00443-19] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 05/16/2019] [Indexed: 11/20/2022] Open
Abstract
The objective of this study was to quantify the potential for hydrocarbon biodegradation in surface waters of three sites, representing geographic regions of major oil exploration (Beaufort Sea in the Arctic, northern Gulf of Mexico [GOM], and southern GOM), in a systematic experimental design that incorporated gradients in temperature and the availability of major nutrients. Surface seawater was amended in microcosms with Macondo surrogate oil to simulate an oil slick, and microcosms were incubated, with or without nutrient amendment, at temperatures ranging from 4 to 38ºC. Using respiration rate as a proxy, distinct temperature responses were observed in surface seawater microcosms based on geographic origin; biodegradation was nearly always more rapid in the Arctic site samples than in the GOM samples. Nutrient amendment enhanced respiration rates by a factor of approximately 6, stimulated microbial growth, and generally elevated the taxonomic diversity of microbial communities within the optimal temperature range for activity at each site, while diversity remained the same or was lower at temperatures deviating from optimal conditions. Taken together, our results advance the understanding of how bacterioplankton communities from different geographic regions respond to oil perturbation. A pulsed disturbance of oil is proposed to favor copiotrophic r-strategists that are adapted to pointed seasonal inputs of phytoplankton carbon, displaying carbon and nutrient limitations, rather than oil exposure history. Further understanding of the ecological mechanisms underpinning the complex environmental controls of hydrocarbon degradation is required for improvement of predictive models of the fate and transport of spilled oil in marine environments.IMPORTANCE The risk of an oil spill accident in pristine regions of the world's oceans is increasing due to the development and transport of crude oil resources, especially in the Arctic region, as a result of the opening of ice-free transportation routes, and there is currently no consensus regarding the complex interplay among the environmental controls of petroleum hydrocarbon biodegradation for predictive modeling. We examined the hydrocarbon biodegradation potential of bacterioplankton from three representative geographic regions of oil exploration. Our results showed that rates of aerobic respiration coupled to hydrocarbon degradation in surface ocean waters are controlled to a large extent by effects of temperature and nutrient limitation; hydrocarbon exposure history did not appear to have a major impact. Further, the relationship between temperature and biodegradation rates is linked to microbial community structure, which is specific to the geographic origin.
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37
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Chen L, Lei Z, Luo X, Wang D, Li L, Li A. Biological Degradation and Transformation Characteristics of Total Petroleum Hydrocarbons by Oil Degradation Bacteria Adsorbed on Modified Straw. ACS OMEGA 2019; 4:10921-10928. [PMID: 31460190 PMCID: PMC6648725 DOI: 10.1021/acsomega.9b00906] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 05/31/2019] [Indexed: 05/23/2023]
Abstract
We report a simple and "green" method for the fabrication of polymer-modified straw-supported oil degradation bacteria (PMS-ODB) for biological degradation of total petroleum hydrocarbons (TPHs) in water. The modification of straw was achieved by in situ copolymerization of styrene and butyl methacrylate using methylene-bis-acrylamide as a cross-linker in an aqueous solution containing straw powders. Compared with the control group (ODB loaded on untreated straw), the results obtained from the experimental group show that the polymer-modified straw is beneficial to the growth of microorganisms. As a result, the degradation rate of TPHs reaches 90.12%, which is 50.54 and 7.08% higher than that of the blank group (ODB only) and the control group, respectively. A study on the transformation characteristics of PMS-ODB shows that the degradation rate of alkanes with low, medium, and high carbon number is higher than 90%. w(∑C21-)/w(∑C22+) (the mass ratio of normal alkanes of high carbon/low carbon), w(pr)/w(ph) (the ratio of pristane/phytane), and OEP (the mass ratio of normal alkanes of odd carbon/even carbon) for TPHs in the experimental group were measured to be 0.6186, 0.7248, and 1.4356, respectively, all of which are the largest value among the blank group, control group, and experimental group. These findings indicate that compared with the control group, the modification of straw could enhance the comprehensive biological degradation performance for TPHs, even those highly stable organics, such as carbon n-alkanes and isoprenoid hydrocarbon, which may open a new possibility for degradation of oils or toxic organics in an enhanced biological manner.
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Affiliation(s)
- Lihua Chen
- School
of Chemical Engineering and Center of Experiment, Northwest
Minzu University, Lanzhou 730030, P. R China
| | - Zhongchun Lei
- School
of Chemical Engineering and Center of Experiment, Northwest
Minzu University, Lanzhou 730030, P. R China
| | - Xiaofang Luo
- School
of Chemical Engineering and Center of Experiment, Northwest
Minzu University, Lanzhou 730030, P. R China
| | - Dongmei Wang
- School
of Chemical Engineering and Center of Experiment, Northwest
Minzu University, Lanzhou 730030, P. R China
| | - Li Li
- School
of Chemical Engineering and Center of Experiment, Northwest
Minzu University, Lanzhou 730030, P. R China
| | - An Li
- Department
of Chemical Engineering, College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
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38
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Potts LD, Perez Calderon LJ, Gontikaki E, Keith L, Gubry-Rangin C, Anderson JA, Witte U. Effect of spatial origin and hydrocarbon composition on bacterial consortia community structure and hydrocarbon biodegradation rates. FEMS Microbiol Ecol 2019; 94:5047303. [PMID: 29982504 PMCID: PMC6166136 DOI: 10.1093/femsec/fiy127] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 06/26/2018] [Indexed: 12/30/2022] Open
Abstract
Oil reserves in deep-sea sediments are currently subject to intense exploration, with associated risks of oil spills. Previous research suggests that microbial communities from deep-sea sediment (>1000m) can degrade hydrocarbons (HCs), but have a lower degradation ability than shallow (<200m) communities, probably due to in situ temperature. This study aimed to assess the effect of marine origin on microbial HC degradation potential while separating the influence of temperature, and to characterise associated HC-degrading bacterial communities. Microbial communities from 135 and 1000 m deep sediments were selectively enriched on crude oil at in situ temperatures and both consortia were subsequently incubated for 42 days at 20°C with two HC mixtures: diesel fuel or model oil. Significant HC biodegradation occurred rapidly in the presence of both consortia, especially of low molecular weight HCs and was concomitant with microbial community changes. Further, oil degradation was higher with the shallow consortium than with the deep one. Dominant HC-degrading bacteria differed based on both spatial origin of the consortia and supplemented HC types. This study provides evidence for influence of sediment spatial origin and HC composition on the selection and activity of marine HC-degrading bacterial communities and is relevant for future bioremediationdevelopments.
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Affiliation(s)
- Lloyd D Potts
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom.,Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Fraser Noble Building, Elphinstone Road, Aberdeen, AB24 3UE, United Kingdom
| | - Luis J Perez Calderon
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom.,Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Fraser Noble Building, Elphinstone Road, Aberdeen, AB24 3UE, United Kingdom
| | - Evangelia Gontikaki
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom
| | - Lehanne Keith
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom
| | - Cécile Gubry-Rangin
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom
| | - James A Anderson
- Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Fraser Noble Building, Elphinstone Road, Aberdeen, AB24 3UE, United Kingdom
| | - Ursula Witte
- Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen, AB24 3UL, United Kingdom
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39
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Potential for Microbially Mediated Natural Attenuation of Diluted Bitumen on the Coast of British Columbia (Canada). Appl Environ Microbiol 2019; 85:AEM.00086-19. [PMID: 30850431 DOI: 10.1128/aem.00086-19] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 03/01/2019] [Indexed: 11/20/2022] Open
Abstract
Western Canada produces large amounts of bitumen, a heavy, highly weathered crude oil. Douglas Channel and Hecate Strait on the coast of British Columbia are two water bodies that may be impacted by a proposed pipeline and marine shipping route for diluted bitumen (dilbit). This study investigated the potential of microbial communities from these waters to mitigate the impacts of a potential dilbit spill. Microcosm experiments were set up with water samples representing different seasons, years, sampling stations, and dilbit blends. While the alkane fraction of the tested dilbit blends was almost completely degraded after 28 days, the majority of the polycyclic aromatic hydrocarbons (PAHs) remained. The addition of the dispersant Corexit 9500A most often had either no effect or an enhancing effect on dilbit degradation. Dilbit-degrading microbial communities were highly variable between seasons, years, and stations, with dilbit type having little impact on community trajectories. Potential oil-degrading genera showed a clear succession pattern and were for the most part recruited from the "rare biosphere." At the community level, dispersant appeared to stimulate an accelerated enrichment of genera typically associated with hydrocarbon degradation, even in dilbit-free controls. This suggests that dispersant-induced growth of hydrocarbon degraders (and not only increased bioavailability of oil-associated hydrocarbons) contributes to the degradation-enhancing effect previously reported for Corexit 9500A.IMPORTANCE Western Canada hosts large petroleum deposits, which ultimately enter the market in the form of dilbit. Tanker-based shipping represents the primary means to transport dilbit to international markets. With anticipated increases in production to meet global energy needs, the risk of a dilbit spill is expected to increase. This study investigated the potential of microbial communities naturally present in the waters of a potential dilbit shipping lane to mitigate the effects of a spill. Here we show that microbial degradation of dilbit was mostly limited to n-alkanes, while the overall concentration of polycyclic aromatic hydrocarbons, which represent the most toxic fraction of dilbit, decreased only slightly within the time frame of our experiments. We further investigated the effect of the oil dispersant Corexit 9500A on microbial dilbit degradation. Our results highlight the fact that dispersant-associated growth stimulation, and not only increased bioavailability of hydrocarbons and inhibition of specific genera, contributes to the overall effect of dispersant addition.
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Potts LD, Perez Calderon LJ, Gubry-Rangin C, Witte U, Anderson JA. Characterisation of microbial communities of drill cuttings piles from offshore oil and gas installations. MARINE POLLUTION BULLETIN 2019; 142:169-177. [PMID: 31232291 DOI: 10.1016/j.marpolbul.2019.03.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 03/03/2019] [Accepted: 03/08/2019] [Indexed: 06/09/2023]
Abstract
Drill cuttings (DC) are produced during hydrocarbon drilling operations and are composed of subsurface rock coated with hydrocarbons and drilling fluids. Historic disposal of DC at sea has resulted in the formation of large piles on the seabed that may be left in situ following infrastructure decommissioning. This study provides a first insight into the microbial abundance, diversity and community structure of two DC piles from North Sea oil and gas installations. The abundance of both bacteria and archaea was lower in DC than in surrounding natural sediments. Microbial diversity and richness within DC were low but increased with distance from the piles. Microbial community structure was significantly different in DC piles compared to nearby natural sediments. DC bacterial communities were dominated by Halomonas, Dietzia and Dethiobacter. The presence of such organisms suggests a potential function of hydrocarbon degradation ability and may play an active role in DC pile remediation.
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Affiliation(s)
- Lloyd D Potts
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom; Chemical and Materials Engineering, School of Engineering, University of Aberdeen, Aberdeen, United Kingdom.
| | - Luis J Perez Calderon
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom; Chemical and Materials Engineering, School of Engineering, University of Aberdeen, Aberdeen, United Kingdom
| | - Cecile Gubry-Rangin
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Ursula Witte
- School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - James A Anderson
- Chemical and Materials Engineering, School of Engineering, University of Aberdeen, Aberdeen, United Kingdom
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Tremblay J, Fortin N, Elias M, Wasserscheid J, King TL, Lee K, Greer CW. Metagenomic and metatranscriptomic responses of natural oil degrading bacteria in the presence of dispersants. Environ Microbiol 2019; 21:2307-2319. [PMID: 30927379 DOI: 10.1111/1462-2920.14609] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 03/21/2019] [Accepted: 03/24/2019] [Indexed: 01/02/2023]
Abstract
Oil biodegradation has been extensively studied in the wake of the deepwater horizon spill, but the application of dispersant to oil spills in marine environments remains controversial. Here, we report metagenomic (MG) and metatranscriptomic (MT) data mining from microcosm experiments investigating the oil degrading potential of Canadian west and east coasts to estimate the gene abundance and activity of oil degrading bacteria in the presence of dispersant. We found that the addition of dispersant to crude oil mainly favours the abundance of Thalassolituus in the summer and Oleispira in the winter, two key natural oil degrading bacteria. We found a high abundance of genes related not only to n-alkane and aromatics degradation but also associated with transporters, two-component systems, bacterial motility, secretion systems and bacterial chemotaxis.
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Affiliation(s)
- Julien Tremblay
- Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount Avenue, Montreal, Quebec, H4P2R2, Canada
| | - Nathalie Fortin
- Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount Avenue, Montreal, Quebec, H4P2R2, Canada
| | - Miria Elias
- Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount Avenue, Montreal, Quebec, H4P2R2, Canada
| | - Jessica Wasserscheid
- Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount Avenue, Montreal, Quebec, H4P2R2, Canada
| | - Thomas L King
- Centre for Offshore Oil, Gas and Energy Research (COOGER), Fisheries and Oceans Canada, Dartmouth, Nova Scotia, B2Y4A2, Canada
| | - Kenneth Lee
- Fisheries and Oceans Canada, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia, B2Y4A2, Canada
| | - Charles W Greer
- Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount Avenue, Montreal, Quebec, H4P2R2, Canada
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Gregson BH, Metodieva G, Metodiev MV, Golyshin PN, McKew BA. Differential Protein Expression During Growth on Medium Versus Long-Chain Alkanes in the Obligate Marine Hydrocarbon-Degrading Bacterium Thalassolituus oleivorans MIL-1. Front Microbiol 2018; 9:3130. [PMID: 30619200 PMCID: PMC6304351 DOI: 10.3389/fmicb.2018.03130] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 12/04/2018] [Indexed: 02/02/2023] Open
Abstract
The marine obligate hydrocarbonoclastic bacterium Thalassolituus oleivorans MIL-1 metabolizes a broad range of aliphatic hydrocarbons almost exclusively as carbon and energy sources. We used LC-MS/MS shotgun proteomics to identify proteins involved in aerobic alkane degradation during growth on medium- (n-C14) or long-chain (n-C28) alkanes. During growth on n-C14, T. oleivorans expresses an alkane monooxygenase system involved in terminal oxidation including two alkane 1-monooxygenases, a ferredoxin, a ferredoxin reductase and an aldehyde dehydrogenase. In contrast, during growth on long-chain alkanes (n-C28), T. oleivorans may switch to a subterminal alkane oxidation pathway evidenced by significant upregulation of Baeyer-Villiger monooxygenase and an esterase, proteins catalyzing ketone and ester metabolism, respectively. The metabolite (primary alcohol) generated from terminal oxidation of an alkane was detected during growth on n-C14 but not on n-C28 also suggesting alternative metabolic pathways. Expression of both active and passive transport systems involved in uptake of long-chain alkanes was higher when compared to the non-hydrocarbon control, including a TonB-dependent receptor, a FadL homolog and a specialized porin. Also, an inner membrane transport protein involved in the export of an outer membrane protein was expressed. This study has demonstrated the substrate range of T. oleivorans is larger than previously reported with growth from n-C10 up to n-C32. It has also greatly enhanced our understanding of the fundamental physiology of T. oleivorans, a key bacterium that plays a significant role in natural attenuation of marine oil pollution, by identifying key enzymes expressed during the catabolism of n-alkanes.
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Affiliation(s)
- Benjamin H Gregson
- School of Biological Sciences, University of Essex, Colchester, United Kingdom
| | - Gergana Metodieva
- School of Biological Sciences, University of Essex, Colchester, United Kingdom
| | - Metodi V Metodiev
- School of Biological Sciences, University of Essex, Colchester, United Kingdom
| | - Peter N Golyshin
- School of Biological Sciences, Bangor University, Bangor, United Kingdom.,School of Natural Sciences, College of Environmental Sciences and Engineering, Bangor University, Bangor, United Kingdom
| | - Boyd A McKew
- School of Biological Sciences, University of Essex, Colchester, United Kingdom
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Perez Calderon LJ, Gontikaki E, Potts LD, Shaw S, Gallego A, Anderson JA, Witte U. Pressure and temperature effects on deep-sea hydrocarbon-degrading microbial communities in subarctic sediments. Microbiologyopen 2018; 8:e00768. [PMID: 30444300 PMCID: PMC6562134 DOI: 10.1002/mbo3.768] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/20/2018] [Accepted: 10/22/2018] [Indexed: 12/24/2022] Open
Abstract
The Hatton-Rockall Basin (North-East Atlantic) is an area with potential for deep-sea (2,900 m) hydrocarbon exploration. Following the Deepwater Horizon oil spill, many investigations into the responses of sediment microbial communities to oil pollution have been undertaken. However, hydrostatic pressure is a parameter that is often omitted due to the technical difficulties associated with conducting experiments at high pressure (>10 MPa). In this study, sediments from 2,900 m in the Hatton-Rockall Basin, following a one-week decompression period in a temperature-controlled room at 5°C, were incubated in factorial combinations of 0.1 and 30 MPa, 5 and 20°C, and contamination with a hydrocarbon mixture or uncontaminated controls to evaluate the effect of these environmental variables on the bacterial community composition. Our results revealed varying effects of pressure, temperature, and oil contamination on the composition of the bacterial community within the sediment. Temperature was the strongest determinant of differences in the bacterial community structure between samples followed by pressure. Oil contamination did not exert a strong change in the sediment bacterial community structure when pressure and temperature conditions were held at in situ levels (30 MPa and 5°C). The γ-proteobacteria Pseudomonas and Colwellia, and several Bacteroidetes dominated communities at 30 MPa. In contrast, hydrocarbon degraders such as Halomonas, Alcanivorax, and Marinobacter decreased in relative abundance at the same pressure. This study highlights the importance of considering hydrostatic pressure in ex situ investigations into hydrocarbon-degrading deepwater microbial communities.
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Affiliation(s)
- Luis J Perez Calderon
- Institute of Biological and Environmental Science, University of Aberdeen, Aberdeen, UK.,Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, UK.,Marine Laboratory Aberdeen, Marine Scotland Science, Aberdeen, UK
| | - Evangelia Gontikaki
- Institute of Biological and Environmental Science, University of Aberdeen, Aberdeen, UK
| | - Lloyd D Potts
- Institute of Biological and Environmental Science, University of Aberdeen, Aberdeen, UK.,Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, UK
| | - Sophie Shaw
- Centre for Genome Enabled Biology and Medicine, University of Aberdeen, Aberdeen, UK
| | | | - James A Anderson
- Surface Chemistry and Catalysis Group, Materials and Chemical Engineering, School of Engineering, University of Aberdeen, Aberdeen, UK
| | - Ursula Witte
- Institute of Biological and Environmental Science, University of Aberdeen, Aberdeen, UK
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Wang W, Wang L, Shao Z. Polycyclic Aromatic Hydrocarbon (PAH) Degradation Pathways of the Obligate Marine PAH Degrader Cycloclasticus sp. Strain P1. Appl Environ Microbiol 2018; 84:AEM.01261-18. [PMID: 30171002 PMCID: PMC6193391 DOI: 10.1128/aem.01261-18 10.1016/j.biotechadv.2015.04.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 08/19/2018] [Indexed: 06/12/2023] Open
Abstract
Bacteria play an important role in the removal of polycyclic aromatic hydrocarbons (PAHs) from polluted environments. In marine environments, Cycloclasticus is one of the most prevalent PAH-degrading bacterial genera. However, little is known regarding the degradation mechanisms for multiple PAHs by CycloclasticusCycloclasticus sp. strain P1 was isolated from deep-sea sediments and is known to degrade naphthalene, phenanthrene, pyrene, and other aromatic hydrocarbons. Here, six ring-hydroxylating dioxygenases (RHDs) were identified in the complete genome of Cycloclasticus sp. P1 and were confirmed to be involved in PAH degradation by enzymatic assays. Further, five gene clusters in its genome were identified to be responsible for PAH degradation. Degradation pathways for naphthalene, phenanthrene, and pyrene were elucidated in Cycloclasticus sp. P1 based on genomic and transcriptomic analysis and characterization of an interconnected metabolic network. The metabolic pathway overlaps in many steps in the degradation of pyrene, phenanthrene, and naphthalene, which were validated by the detection of metabolic intermediates in cultures. This study describes a pyrene degradation pathway for Cycloclasticus. Moreover, the study represents the integration of a PAH metabolic network that comprises pyrene, phenanthrene, and naphthalene degradation pathways. Taken together, these results provide a comprehensive investigation of PAH metabolism in CycloclasticusIMPORTANCE PAHs are ubiquitous in the environment and are carcinogenic compounds and tend to accumulate in food chains due to their low bioavailability and poor biodegradability. Cycloclasticus is an obligate marine PAH degrader and is widespread in marine environments, while the PAH degradation pathways remain unclear. In this report, the degradation pathways for naphthalene, phenanthrene, and pyrene were revealed, and an integrated PAH metabolic network covering pyrene, phenanthrene, and naphthalene was constructed in Cycloclasticus This overlapping network provides streamlined processing of PAHs to intermediates and ultimately to complete mineralization. Furthermore, these results provide an additional context for the prevalence of Cycloclasticus in oil-polluted marine environments and pelagic settings. In conclusion, these analyses provide a useful framework for understanding the cellular processes involved in PAH metabolism in an ecologically important marine bacterium.
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Affiliation(s)
- Wanpeng Wang
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China
- Xiamen Key Laboratory of Marine Genetic Resources, State Key Laboratory Breeding Base, Xiamen, China
- Fujian Key Laboratory of Marine Genetic Resources, Xiamen, China
| | - Lin Wang
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China
- Xiamen Key Laboratory of Marine Genetic Resources, State Key Laboratory Breeding Base, Xiamen, China
- Fujian Key Laboratory of Marine Genetic Resources, Xiamen, China
| | - Zongze Shao
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, SOA, Xiamen, China
- Xiamen Key Laboratory of Marine Genetic Resources, State Key Laboratory Breeding Base, Xiamen, China
- Fujian Key Laboratory of Marine Genetic Resources, Xiamen, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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45
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Kim HS, Dong K, Kim J, Lee SS. Characteristics of crude oil-degrading bacteria Gordonia iterans isolated from marine coastal in Taean sediment. Microbiologyopen 2018; 8:e00754. [PMID: 30338941 PMCID: PMC6562140 DOI: 10.1002/mbo3.754] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 09/18/2018] [Accepted: 09/20/2018] [Indexed: 01/01/2023] Open
Abstract
Crude oil is a major pollutant of marine and coastal ecosystems, and it causes environmental problems more seriously. It is believed ultimate and complete degradation is accomplished mainly by microorganisms. In this study, we aim to search out for bacterial strains with high ability in degrading crude oil. From sediments contaminated by the petroleum spilled in 2007, an accident in Taean, South Korea, we isolated thirty‐one bacterial strains in total with potential application in crude oil contamination remediation. In terms of removal percentage after 7 days, one of the strains, Co17, showed the highest removal efficiency with 84.2% of crude oil in Bushnell‐Haas media. The Co17 strain even exhibited outstanding ability removing crude oil at a high salt concentration. Through the whole genome sequencing annotation results, many genes related with n‐alkane degradation in the genome of Gordonia sp. Co17, revealed alkane‐1‐monooxygenase, alcohol dehydrogenase, and Baeyer–Villiger monooxygenase. Specially, for confirmation of gene‐level, alkB gene encoding alkane hydroxylase (alkane‐1‐monooxygenase) was found in the strain Co17. The expression of alkB upregulated 125‐fold after 18 hr accompany with the removal of n‐alkanes of 48.9%. We therefore propose the strain Gordonia iterans Co17, isolated from crude oil‐contaminated marine sediment, could be used to offer a new strategy for bioremediation with high efficiency.
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Affiliation(s)
- Hyun-Sook Kim
- Department of Biological Engineering, Kyonggi University, Suwon-si, Korea
| | - Ke Dong
- Department of Life Science, Kyonggi University, Suwon-si, Korea
| | - Jinsoo Kim
- Department of Life Science, Kyonggi University, Suwon-si, Korea
| | - Sang-Seob Lee
- Department of Biological Engineering, Kyonggi University, Suwon-si, Korea.,Department of Life Science, Kyonggi University, Suwon-si, Korea
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46
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Polycyclic Aromatic Hydrocarbon (PAH) Degradation Pathways of the Obligate Marine PAH Degrader Cycloclasticus sp. Strain P1. Appl Environ Microbiol 2018; 84:AEM.01261-18. [PMID: 30171002 DOI: 10.1128/aem.01261-18] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 08/19/2018] [Indexed: 12/13/2022] Open
Abstract
Bacteria play an important role in the removal of polycyclic aromatic hydrocarbons (PAHs) from polluted environments. In marine environments, Cycloclasticus is one of the most prevalent PAH-degrading bacterial genera. However, little is known regarding the degradation mechanisms for multiple PAHs by Cycloclasticus Cycloclasticus sp. strain P1 was isolated from deep-sea sediments and is known to degrade naphthalene, phenanthrene, pyrene, and other aromatic hydrocarbons. Here, six ring-hydroxylating dioxygenases (RHDs) were identified in the complete genome of Cycloclasticus sp. P1 and were confirmed to be involved in PAH degradation by enzymatic assays. Further, five gene clusters in its genome were identified to be responsible for PAH degradation. Degradation pathways for naphthalene, phenanthrene, and pyrene were elucidated in Cycloclasticus sp. P1 based on genomic and transcriptomic analysis and characterization of an interconnected metabolic network. The metabolic pathway overlaps in many steps in the degradation of pyrene, phenanthrene, and naphthalene, which were validated by the detection of metabolic intermediates in cultures. This study describes a pyrene degradation pathway for Cycloclasticus. Moreover, the study represents the integration of a PAH metabolic network that comprises pyrene, phenanthrene, and naphthalene degradation pathways. Taken together, these results provide a comprehensive investigation of PAH metabolism in Cycloclasticus IMPORTANCE PAHs are ubiquitous in the environment and are carcinogenic compounds and tend to accumulate in food chains due to their low bioavailability and poor biodegradability. Cycloclasticus is an obligate marine PAH degrader and is widespread in marine environments, while the PAH degradation pathways remain unclear. In this report, the degradation pathways for naphthalene, phenanthrene, and pyrene were revealed, and an integrated PAH metabolic network covering pyrene, phenanthrene, and naphthalene was constructed in Cycloclasticus This overlapping network provides streamlined processing of PAHs to intermediates and ultimately to complete mineralization. Furthermore, these results provide an additional context for the prevalence of Cycloclasticus in oil-polluted marine environments and pelagic settings. In conclusion, these analyses provide a useful framework for understanding the cellular processes involved in PAH metabolism in an ecologically important marine bacterium.
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47
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Tiralerdpanich P, Sonthiphand P, Luepromchai E, Pinyakong O, Pokethitiyook P. Potential microbial consortium involved in the biodegradation of diesel, hexadecane and phenanthrene in mangrove sediment explored by metagenomics analysis. MARINE POLLUTION BULLETIN 2018; 133:595-605. [PMID: 30041354 DOI: 10.1016/j.marpolbul.2018.06.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/22/2018] [Accepted: 06/05/2018] [Indexed: 06/08/2023]
Abstract
Hydrocarbon contamination is a serious problem that degrades the quality of mangrove ecosystems, and bioremediation using autochthonous bacteria is a promising technology to recover an impacted environment. This research investigates the biodegradation rates of diesel, hexadecane and phenanthrene, by conducting a microcosm study and survey of the autochthonous microbial community in contaminated mangrove sediment, using an Illumina MiSeq platform. The biodegradation rates of diesel, hexadecane and phenanthrene were 82, 86 and 8 mg kg-1 sediment day-1, respectively. The removal efficiencies of hexadecane and phenanthrene were >99%, whereas the removal efficiency of diesel was 88%. A 16S rRNA gene amplicon sequence analysis revealed that the major bacterial assemblages detected were Gammaproteobacteria, Deltaproteobacteria, Alphaproteobacteria. The bacterial compositions were relatively constant, while reductions of the supplemented hydrocarbons were observed. The results imply that the autochthonous microorganisms in the mangrove sediment were responsible for the degradation of the respective hydrocarbons. Diesel-, hexadecane- and phenanthrene-degrading bacteria, namely Bacillus sp., Pseudomonas sp., Acinetobacter sp. and Staphylococcus sp., were also isolated from the mangrove sediment. The mangrove sediment provides a potential resource of effective hydrocarbon-degrading bacteria that can be used as an inoculum or further developed as a ready-to-use microbial consortium for the purpose of bioremediation.
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Affiliation(s)
- Parichaya Tiralerdpanich
- International Postgraduate Program in Hazardous Substance and Environmental Management, Chulalongkorn University, 9th Floor, CU Research Building, Phayathai Road, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management, Chulalongkorn University, 8th Floor, CU Research Building, Phayathai Road, Bangkok 10330, Thailand
| | - Prinpida Sonthiphand
- Department of Biology, Faculty of Science, Mahidol University, 272 Rama VI Road, Ratchathewi, Bangkok 10400, Thailand.
| | - Ekawan Luepromchai
- Microbial Technology for Marine Pollution Treatment Research Unit, Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management, Chulalongkorn University, 8th Floor, CU Research Building, Phayathai Road, Bangkok 10330, Thailand
| | - Onruthai Pinyakong
- Microbial Technology for Marine Pollution Treatment Research Unit, Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Bangkok 10330, Thailand; Center of Excellence on Hazardous Substance Management, Chulalongkorn University, 8th Floor, CU Research Building, Phayathai Road, Bangkok 10330, Thailand
| | - Prayad Pokethitiyook
- Department of Biology, Faculty of Science, Mahidol University, 272 Rama VI Road, Ratchathewi, Bangkok 10400, Thailand
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Brakstad OG, Davies EJ, Ribicic D, Winkler A, Brönner U, Netzer R. Biodegradation of dispersed oil in natural seawaters from Western Greenland and a Norwegian fjord. Polar Biol 2018. [DOI: 10.1007/s00300-018-2380-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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49
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Laccases from Marine Organisms and Their Applications in the Biodegradation of Toxic and Environmental Pollutants: a Review. Appl Biochem Biotechnol 2018; 187:583-611. [DOI: 10.1007/s12010-018-2829-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 06/25/2018] [Indexed: 10/28/2022]
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50
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Deshpande RS, Sundaravadivelu D, Techtmann S, Conmy RN, Santo Domingo JW, Campo P. Microbial degradation of Cold Lake Blend and Western Canadian select dilbits by freshwater enrichments. JOURNAL OF HAZARDOUS MATERIALS 2018; 352:111-120. [PMID: 29602070 PMCID: PMC6754826 DOI: 10.1016/j.jhazmat.2018.03.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 03/14/2018] [Accepted: 03/16/2018] [Indexed: 05/19/2023]
Abstract
Treatability experiments were conducted to determine the biodegradation of diluted bitumen (dilbit) at 5 and 25 °C for 72 and 60 days, respectively. Microbial consortia obtained from the Kalamazoo River Enbridge Energy spill site were enriched on dilbit at both 5 (cryo) and 25 (meso) ºC. On every sampling day, triplicates were sacrificed and residual hydrocarbon concentrations (alkanes and polycyclic aromatic hydrocarbons) were determined by GCMS/MS. The composition and relative abundance of different bacterial groups were identified by 16S rRNA gene sequencing analysis. While some physicochemical differences were observed between the two dilbits, their biodegradation profiles were similar. The rates and extent of degradation were greater at 25 °C. Both consortia metabolized 99.9% of alkanes; however, the meso consortium was more effective at removing aromatics than the cryo consortium (97.5 vs 70%). Known hydrocarbon-degrading bacteria were present in both consortia (Pseudomonas, Rhodococcus, Hydrogenophaga, Parvibaculum, Arthrobacter, Acidovorax), although their relative abundances depended on the temperatures at which they were enriched. Regardless of the dilbit type, the microbial community structure significantly changed as a response to the diminishing hydrocarbon load. Our results demonstrate that dilbit can be effectively degraded by autochthonous microbial consortia from sites with recent exposure to dilbit contamination.
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Affiliation(s)
- Ruta S Deshpande
- Pegasus Technical Services Inc., 46 E Hollister Street, Cincinnati, OH 45219, USA
| | - Devi Sundaravadivelu
- Pegasus Technical Services Inc., 46 E Hollister Street, Cincinnati, OH 45219, USA
| | - Stephen Techtmann
- Department of Biological Sciences, Michigan Technological University, Houghton, MI 49931, USA
| | - Robyn N Conmy
- U.S. EPA, 26 W. MLK Drive, Cincinnati, OH 45268, USA
| | | | - Pablo Campo
- Cranfield Water Science Institute, Cranfield University, Cranfield MK43 0AL, UK.
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