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Paltsev A, Bergström AK, Vuorio K, Creed IF, Hessen DO, Kortelainen P, Vuorenmaa J, de Wit HA, Lau DCP, Vrede T, Isles PDF, Jonsson A, Geibrink E, Kahilainen KK, Drakare S. Phytoplankton biomass in northern lakes reveals a complex response to global change. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 940:173570. [PMID: 38825201 DOI: 10.1016/j.scitotenv.2024.173570] [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: 02/28/2024] [Revised: 04/25/2024] [Accepted: 05/25/2024] [Indexed: 06/04/2024]
Abstract
Global change may introduce fundamental alterations in phytoplankton biomass and community structure that can alter the productivity of northern lakes. In this study, we utilized Swedish and Finnish monitoring data from lakes that are spatially (135 lakes) and temporally (1995-2019, 110 lakes) extensive to assess how phytoplankton biomass (PB) of dominant phytoplankton groups related to changes in water temperature, pH and key nutrients [total phosphorus (TP), total nitrogen (TN), total organic carbon (TOC), iron (Fe)] along spatial (Fennoscandia) and temporal (25 years) gradients. Using a machine learning approach, we found that TP was the most important determinant of total PB and biomass of a specific species of Raphidophyceae - Gonyostomum semen - and Cyanobacteria (both typically with adverse impacts on food-webs and water quality) in spatial analyses, while Fe and pH were second in importance for G. semen and TN and pH were second and third in importance for Cyanobacteria. However, in temporal analyses, decreasing Fe and increasing pH and TOC were associated with a decrease in G. semen and an increase in Cyanobacteria. In addition, in many lakes increasing TOC seemed to have generated browning to an extent that significantly reduced PB. The identified discrepancy between the spatial and temporal results suggests that substitutions of data for space-for-time may not be adequate to characterize long-term effects of global change on phytoplankton. Further, we found that total PB exhibited contrasting temporal trends (increasing in northern- and decreasing in southern Fennoscandia), with the decline in total PB being more pronounced than the increase. Among phytoplankton, G. semen biomass showed the strongest decline, while cyanobacterial biomass showed the strongest increase over 25 years. Our findings suggest that progressing browning and changes in Fe and pH promote significant temporal changes in PB and shifts in phytoplankton community structures in northern lakes.
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Affiliation(s)
- Aleksey Paltsev
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
| | | | | | - Irena F Creed
- Department of Physical and Environmental Sciences, University of Toronto, Toronto, Ontario, Canada
| | - Dag Olav Hessen
- Centre of Biogeochemistry in the Anthropocene and Department of Bioscience, University of Oslo, Oslo, Norway
| | | | | | - Heleen A de Wit
- Centre of Biogeochemistry in the Anthropocene and Department of Bioscience, University of Oslo, Oslo, Norway; Norwegian Institute for Water Research, Oslo, Norway
| | - Danny C P Lau
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Tobias Vrede
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Peter D F Isles
- Watershed Management Division, Vermont Department of Environmental Conservation, Montpelier, VT, USA
| | - Anders Jonsson
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
| | - Erik Geibrink
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
| | | | - Stina Drakare
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
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2
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Bergman I, Lindström ES, Sassenhagen I. Ciliate Grazing on the Bloom-Forming Microalga Gonyostomum semen. MICROBIAL ECOLOGY 2024; 87:33. [PMID: 38236289 PMCID: PMC10796478 DOI: 10.1007/s00248-024-02344-9] [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: 08/10/2023] [Accepted: 01/03/2024] [Indexed: 01/19/2024]
Abstract
The freshwater raphidophyte Gonyostomum semen forms extensive summer blooms in northern European humic lakes. The development of these blooms might be facilitated by a lack of natural top-down control, as few zooplankton species are able to prey on these large algal cells (up to 100 μm) that expel trichocysts upon physical stress. In this study, we describe a small ciliate species (< 17 μm) that preys on G. semen by damaging the cell membrane until cytoplasm and organelles spill out. Sequencing of clonal cultures of the ciliate tentatively identified it as the prostomatid species Urotricha pseudofurcata. Grazing experiments illustrated that feeding by U. cf. pseudofurcata can significantly reduce cell concentrations of the microalga. However, differences in cell size and growth rate between two investigated ciliate strains resulted in noticeably different grazing pressure. Environmental sequencing data from five different lakes supported potential interactions between the two species. Urotricha cf. pseudofurcata might, thus, play an important role in aquatic ecosystems that are regularly dominated by G. semen, reducing the abundance of this bloom-forming microalga and enabling transfer of organic carbon to higher trophic levels.
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Affiliation(s)
- Ingrid Bergman
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden
| | - Eva S Lindström
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden
| | - Ingrid Sassenhagen
- Department of Ecology and Genetics/Limnology, Uppsala University, Uppsala, Sweden.
- Biological Oceanography, Institute for Baltic Sea Research in Warnemünde, Seestraße 15, Rostock, 18119, Germany.
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3
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Strandberg U, Arhonditsis G, Kesti P, Vesterinen J, Vesamäki JS, Taipale SJ, Kankaala P. Environmental drivers alter PUFA content in littoral macroinvertebrate assemblages via changes in richness and abundance. AQUATIC SCIENCES 2023; 85:100. [PMID: 37663589 PMCID: PMC10471644 DOI: 10.1007/s00027-023-00996-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/04/2023] [Indexed: 09/05/2023]
Abstract
Shallow littoral areas in lakes are productive and highly diverse ecotonal zones, providing habitats for both invertebrate and vertebrate species. We developed a Bayesian modeling framework to elucidate the relationships between environmental drivers (lake typology, habitat, water chemistry, and latitude) and taxon richness, abundance, as well as the content of polyunsaturated fatty acids (PUFAs) in littoral macroinvertebrate communities in 95 boreal lakes. PUFAs, particularly arachidonic acid (ARA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA), are critical micronutrients to maintain normal physiological functions in consumers. Lake typology was a significant predictor for PUFA content in the invertebrate assemblages, which was connected to taxon richness and/or abundance. Benthic communities in large humus-poor or nutrient-rich lakes displayed higher abundance, taxon richness, and more PUFA-rich taxa, whereas those in medium- and large-sized humic (color 30-90 mg Pt/L) and humus-rich lakes (color >90 mg Pt/L) were characterized by decreased abundance and subsequently low PUFA content. The abundance, taxon richness, and nutritional quality of the communities were also strongly related to latitude. Lakes with lower pH were characterized by lower benthic invertebrate diversity and low frequency of taxa with high somatic EPA and DHA content. The complexity of littoral habitats dominated by various macrophyte assemblages creates an environment that favors higher benthic abundance and increased presence of taxonomic groups with high PUFA content. Nutritional quality of benthic invertebrates for upper trophic levels can be modulated by a complex interplay between external stressors and abiotic factors that typically shape the structure of littoral benthic communities. Supplementary Information The online version contains supplementary material available at 10.1007/s00027-023-00996-2.
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Affiliation(s)
- Ursula Strandberg
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - George Arhonditsis
- Department of Physical and Environmental Sciences, University of Toronto, Toronto, Canada
| | - Petri Kesti
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - Jussi Vesterinen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
- The Association for Water and Environment of Western Uusimaa, Lohja, Finland
| | - Jussi S. Vesamäki
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
- Department of Biological and Environmental Sciences, University of Jyväskylä, Jyväskylä, Finland
| | - Sami J. Taipale
- Department of Biological and Environmental Sciences, University of Jyväskylä, Jyväskylä, Finland
| | - Paula Kankaala
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
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4
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Karpowicz M, Grabowska M, Ejsmont-Karabin J, Ochocka A. Humic lakes with inefficient and efficient transfer of matter in planktonic food webs. Sci Rep 2023; 13:7913. [PMID: 37193728 DOI: 10.1038/s41598-023-35039-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/11/2023] [Indexed: 05/18/2023] Open
Abstract
Humic compounds and related factors are the main constraints for the development of zooplankton in humic lakes, leading to low transfer efficiency in food webs. The results of this study indicated that some zooplankton species could have an advantage under these conditions. We found that the mass development of omnivorous Asplanchna priodonta in temperate humic lakes could be caused by the domination of high nutritional algae such as Gonyostomum semen and Botryococcus braunii. These algae are too large for most zooplankton to ingest, but A. priodonta can feed on a wide range of particles and benefit from this high-nutritional food. Small cladocerans (Ceriodaphnia, Bosmina) might be favored when picoplankton and small algae-dominate humic lakes. Therefore, some zooplankton species could have an advantage and control the development of phytoplankton, leading to the effective transfer of matter and energy in the planktonic food web in humic lakes.
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Affiliation(s)
- Maciej Karpowicz
- Department of Hydrobiology, Faculty of Biology, University of Białystok, Ciołkowskiego 1J, 15-245, Białystok, Poland.
| | - Magdalena Grabowska
- Department of Hydrobiology, Faculty of Biology, University of Białystok, Ciołkowskiego 1J, 15-245, Białystok, Poland
| | - Jolanta Ejsmont-Karabin
- Department of Hydrobiology, Faculty of Biology, University of Białystok, Ciołkowskiego 1J, 15-245, Białystok, Poland
| | - Agnieszka Ochocka
- Department of Freshwater Protection, Institute of Environmental Protection-National Research Institute, Słowicza 32, 02-170, Warsaw, Poland
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Strandberg U, Hiltunen M, Creed IF, Arts MT, Kankaala P. Browning-induced changes in trophic functioning of planktonic food webs in temperate and boreal lakes: insights from fatty acids. Oecologia 2023; 201:183-197. [PMID: 36520221 PMCID: PMC9813244 DOI: 10.1007/s00442-022-05301-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 12/05/2022] [Indexed: 12/16/2022]
Abstract
The effects of lake browning on trophic functioning of planktonic food webs are not fully understood. We studied the effects of browning on the response patterns of polyunsaturated fatty acids and n-3/n-6 ratio in seston and compared them between boreal and temperate lakes. We also compared the regional differences and the effects of lake browning on the reliance of zooplankton on heterotrophic microbial pathways and the mass fractions of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in zooplankton. Lake browning was associated with increasing phytoplankton biomass and concentrations of EPA and DHA in both temperate and boreal lakes, but the seston n-3/n-6 ratio was lower in temperate than boreal lakes, most likely due the differences in phytoplankton community composition. The browning-induced increase in phytoplankton biomass was associated with increased reliance of zooplankton on a heterotrophic microbial pathway for both cladocerans and copepods in boreal and temperate lakes. This increased reliance on the heterotrophic microbial diet was correlated with a decrease in the EPA and DHA mass fractions in temperate copepods and a decrease in the n-3/n-6 ratio in boreal cladocerans and copepods. Our results indicate that although phytoplankton responses to lake browning were similar across regions, this did not directly cascade to the next trophic level, where zooplankton responses were highly taxa- and region-specific. These results indicate that lake browning should be considered as an overarching moderator that is linked to, e.g., nutrient increases, which have more immediate consequences on trophic interactions at the phytoplankton-zooplankton interface.
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Affiliation(s)
- Ursula Strandberg
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - Minna Hiltunen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland ,Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | | | - Michael T. Arts
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Canada
| | - Paula Kankaala
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
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Strandberg U, Hiltunen M, Syväranta J, Levi EE, Davidson TA, Jeppesen E, Brett MT. Combined effects of eutrophication and warming on polyunsaturated fatty acids in complex phytoplankton communities: A mesocosm experiment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 843:157001. [PMID: 35772541 DOI: 10.1016/j.scitotenv.2022.157001] [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: 03/03/2022] [Revised: 06/22/2022] [Accepted: 06/23/2022] [Indexed: 06/15/2023]
Abstract
Climate change and eutrophication are among the main stressors of shallow freshwater ecosystems, and their effects on phytoplankton community structure and primary production have been studied extensively. However, their combined effects on the algal production of polyunsaturated fatty acids (PUFA), specifically, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are currently unresolved. Moreover, the proximate reasons for changes in phytoplankton EPA and DHA concentrations are unclear, i.e., the relative importance of ecological (changes in the community composition) vs. ecophysiological (within taxa changes in EPA and DHA levels) factors. We investigated the responses of phytoplankton EPA and DHA concentrations to warming (IPCC climate scenario) and nutrient additions in mesocosms which had been run continuously at varying temperature and nutrient levels for 15 years prior to this study. Nutrient treatment had a significant effect on phytoplankton EPA and DHA concentrations and about 59 % of the variation in EPA and DHA concentrations could be explained by changes in the phytoplankton community structure. Increased biomass of diatoms corresponded with high EPA and DHA concentrations, while cyanobacteria/chlorophyte dominated mesocosm had low EPA and DHA concentrations. Warming had only a marginal effect on the EPA and DHA concentrations in these mesocosms. However, a significant interaction was observed with warming and N:P ratio. Our findings indicate that direct nutrient/temperature effects on algal physiology and PUFA metabolism were negligible and the changes in EPA and DHA concentrations were mostly related to the phytoplankton community structure and biomass. These results also imply that in shallow temperate lakes eutrophication, leading to increased dominance of cyanobacteria, will probably be a greater threat to phytoplankton EPA and DHA production than warming. EPA and DHA are nutritionally important for upper trophic level consumers and decreased production may impair secondary production.
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Affiliation(s)
- Ursula Strandberg
- University of Eastern Finland, Department of Environmental and Biological Sciences, Joensuu, Finland.
| | - Minna Hiltunen
- University of Jyväskylä, Department of Biological and Environmental Science, Jyväskylä, Finland
| | - Jari Syväranta
- University of Eastern Finland, Department of Environmental and Biological Sciences, Joensuu, Finland
| | - Eti E Levi
- Aarhus University, Department of Ecoscience - Lake Ecology, Silkeborg, Denmark
| | - Thomas A Davidson
- Aarhus University, Department of Ecoscience - Lake Ecology, Silkeborg, Denmark
| | - Erik Jeppesen
- Aarhus University, Department of Ecoscience - Lake Ecology, Silkeborg, Denmark; Sino-Danish Centre for Education and Research, Beijing 100049, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara 06800, Turkey; Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin 33731, Turkey
| | - Michael T Brett
- University of Washington, Civil and Environmental Engineering, Seattle, USA
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7
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Jyväsjärvi J, Rajakallio M, Brüsecke J, Huttunen K, Huusko A, Muotka T, Taipale SJ. Dark matters: Contrasting responses of stream biofilm to browning and loss of riparian shading. GLOBAL CHANGE BIOLOGY 2022; 28:5159-5171. [PMID: 35624548 PMCID: PMC9545655 DOI: 10.1111/gcb.16279] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 04/09/2022] [Accepted: 05/17/2022] [Indexed: 06/03/2023]
Abstract
Concentrations of terrestrial-derived dissolved organic carbon (DOC) in freshwater ecosystems have increased consistently, causing freshwater browning. The mechanisms behind browning are complex, but in forestry-intensive regions browning is accelerated by land drainage. Forestry actions in streamside riparian forests alter canopy shading, which together with browning is expected to exert a complex and largely unpredictable control over key ecosystem functions. We conducted a stream mesocosm experiment with three levels of browning (ambient vs. moderate vs. high, with 2.7 and 5.5-fold increase, respectively, in absorbance) crossed with two levels of riparian shading (70% light reduction vs. open canopy) to explore the individual and combined effects of browning and loss of shading on the quantity (algal biomass) and nutritional quality (polyunsaturated fatty acid and sterol content) of the periphytic biofilm. We also conducted a field survey of differently colored (4.7 to 26.2 mg DOC L-1 ) streams to provide a 'reality check' for our experimental findings. Browning reduced greatly the algal biomass, suppressed the availability of essential polyunsaturated fatty acids, especially eicosapentaenoic acid (EPA), and sterols, but increased the availability of terrestrial-derived long-chain saturated fatty acids (LSAFA). In contrast, loss of shading increased primary productivity, which resulted in elevated sterol and EPA contents of the biofilm. The field survey largely repeated the same pattern: biofilm nutritional quality decreased significantly with increasing DOC, as indicated particularly by a decrease of the ω-3:ω-6 ratio and increase in LSAFA content. Algal biomass, in contrast, was mainly controlled by dissolved inorganic nitrogen (DIN) concentration, while DOC concentration was of minor importance. The ongoing browning process is inducing a dramatic reduction in the nutritional quality of the stream biofilm. Such degradation of the major high-quality food source available for stream consumers may reduce the trophic transfer efficiency in stream ecosystems, potentially extending across the stream-forest ecotone.
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Affiliation(s)
| | | | - Joanna Brüsecke
- Ecology and Genetics Research UnitUniversity of OuluOuluFinland
| | | | - Ari Huusko
- Natural Resources Institute Finland (Luke)PaltamoFinland
| | - Timo Muotka
- Ecology and Genetics Research UnitUniversity of OuluOuluFinland
| | - Sami J. Taipale
- Department of Biological and Environmental ScienceUniversity of JyväskyläJyväskyläFinland
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Blanchet CC, Arzel C, Davranche A, Kahilainen KK, Secondi J, Taipale S, Lindberg H, Loehr J, Manninen-Johansen S, Sundell J, Maanan M, Nummi P. Ecology and extent of freshwater browning - What we know and what should be studied next in the context of global change. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 812:152420. [PMID: 34953836 DOI: 10.1016/j.scitotenv.2021.152420] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 12/10/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
Water browning or brownification refers to increasing water color, often related to increasing dissolved organic matter (DOM) and carbon (DOC) content in freshwaters. Browning has been recognized as a significant physicochemical phenomenon altering boreal lakes, but our understanding of its ecological consequences in different freshwater habitats and regions is limited. Here, we review the consequences of browning on different freshwater habitats, food webs and aquatic-terrestrial habitat coupling. We examine global trends of browning and DOM/DOC, and the use of remote sensing as a tool to investigate browning from local to global scales. Studies have focused on lakes and rivers while seldom addressing effects at the catchment scale. Other freshwater habitats such as small and temporary waterbodies have been overlooked, making the study of the entire network of the catchment incomplete. While past research investigated the response of primary producers, aquatic invertebrates and fishes, the effects of browning on macrophytes, invasive species, and food webs have been understudied. Research has focused on freshwater habitats without considering the fluxes between aquatic and terrestrial habitats. We highlight the importance of understanding how the changes in one habitat may cascade to another. Browning is a broader phenomenon than the heretofore concentration on the boreal region. Overall, we propose that future studies improve the ecological understanding of browning through the following research actions: 1) increasing our knowledge of ecological processes of browning in other wetland types than lakes and rivers, 2) assessing the impact of browning on aquatic food webs at multiple scales, 3) examining the effects of browning on aquatic-terrestrial habitat coupling, 4) expanding our knowledge of browning from the local to global scale, and 5) using remote sensing to examine browning and its ecological consequences.
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Affiliation(s)
- Clarisse C Blanchet
- Department of Biology, FI-20014, University of Turku, Finland; Department of Forest Sciences, P.O. Box 27, University of Helsinki, FI-00014 Helsinki, Finland.
| | - Céline Arzel
- Department of Biology, FI-20014, University of Turku, Finland
| | - Aurélie Davranche
- CNRS UMR 6554 LETG, University of Angers, 2 Boulevard Lavoisier, FR-49000 Angers, France
| | - Kimmo K Kahilainen
- University of Helsinki, Lammi Biological Station, Pääjärventie 320, FI-16900 Lammi, Finland
| | - Jean Secondi
- University of Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622, Villeurbanne, France; Faculty of Sciences, University of Angers, F-49000 Angers, France
| | - Sami Taipale
- Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Henrik Lindberg
- HAMK University of Applied Sciences, Forestry Programme, Saarelantie 1, FI-16970 Evo, Finland
| | - John Loehr
- University of Helsinki, Lammi Biological Station, Pääjärventie 320, FI-16900 Lammi, Finland
| | | | - Janne Sundell
- University of Helsinki, Lammi Biological Station, Pääjärventie 320, FI-16900 Lammi, Finland
| | - Mohamed Maanan
- UMR CNRS 6554, University of Nantes, F-44000 Nantes, France
| | - Petri Nummi
- Department of Forest Sciences, P.O. Box 27, University of Helsinki, FI-00014 Helsinki, Finland
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Yang X, Zhang Y, Liu Q, Guo J, Zhou Q. Progress in the interaction of dissolved organic matter and microbes (1991-2020): a bibliometric review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:16817-16829. [PMID: 34997929 DOI: 10.1007/s11356-022-18540-4] [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: 07/28/2021] [Accepted: 01/03/2022] [Indexed: 06/14/2023]
Abstract
Dissolved organic matter (DOM) and microbes are key in the planetary carbon cycle, and research on them can lead to a better understanding of the global carbon cycle and an improved ability to cope with environmental challenges. Several papers have reviewed one or several aspects of the interaction of DOM and microbes, but no overall review has been performed. Here, we bibliometrically analyzed all publications from the Web of Science on DOM and microbes (1991-2020). The results showed that studies on DOM and microbes grew exponentially during this period; the USA contributed the most to the total publications, and China has had the fastest increasing rate since 2010. Moreover, we used the Latent Dirichlet Allocation model to identify topics and determine their (cold or hot) trends by analyzing the abstracts of 9851 publications related to DOM and microbes. A total of 96 topics were extracted, and these topics that are related to the source, composition, and removal path of DOM and the temporal-spatial patterns of DOM and microbes consistently rose from 1991 to 2020. Most studies have used accurate and rapid methods combined with microbiological genetic approaches to study the interaction of DOM and microbes in terrestrial and aquatic ecosystems. The results also showed that the impacts of climate change and land use on the interaction of DOM and microbes, and topics related to human health have received considerable attention. In the future, the interaction mechanism of DOM and microbes and its response to environmental change should be further elucidated.
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Affiliation(s)
- Xuan Yang
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, China
- Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650500, China
| | - Yun Zhang
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, China
| | - Qi Liu
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, China
| | - Jishu Guo
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, China
| | - Qichao Zhou
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming, 650500, China.
- Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Research Academy of Eco-Environmental Sciences, Kunming, 650034, China.
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