1
|
McCaig ML, Kidd KA, Smenderovac EE, Perrotta BG, Emilson CE, Stastny M, Venier L, Emilson EJS. Response of stream habitat and microbiomes to spruce budworm defoliation: New considerations for outbreak management. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2024:e3020. [PMID: 39155464 DOI: 10.1002/eap.3020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 04/09/2024] [Accepted: 05/23/2024] [Indexed: 08/20/2024]
Abstract
Defoliation by eastern spruce budworm is one of the most important natural disturbances in Canadian boreal and hemi-boreal forests with annual area affected surpassing that of fire and harvest combined, and its impacts are projected to increase in frequency, severity, and range under future climate scenarios. Deciding on an active management strategy to control outbreaks and minimize broader economic, ecological, and social impacts is becoming increasingly important. These strategies differ in the degree to which defoliation is suppressed, but little is known about the downstream consequences of defoliation and, thus, the implications of management. Given the disproportionate role of headwater streams and their microbiomes on net riverine productivity across forested landscapes, we investigated the effects of defoliation by spruce budworm on headwater stream habitat and microbiome structure and function to inform management decisions. We experimentally manipulated a gradient of defoliation among 12 watersheds during a spruce budworm outbreak in the Gaspésie Peninsula, Québec, Canada. From May through October of 2019-2021, stream habitat (flow rates, dissolved organic matter [DOM], water chemistry, and nutrients), algal biomass, and water temperatures were assessed. Bacterial and fungal biofilm communities were examined by incubating six leaf packs for five weeks (mid-August to late September) in one stream reach per watershed. Microbiome community structure was determined using metabarcoding of 16S and ITS rRNA genes, and community functions were examined using extracellular enzyme assays, leaf litter decomposition rates, and taxonomic functional assignments. We found that cumulative defoliation was correlated with increased streamflow rates and temperatures, and more aromatic DOM (measured as specific ultraviolet absorbance at 254 nm), but was not correlated to nutrient concentrations. Cumulative defoliation was also associated with altered microbial community composition, an increase in carbohydrate biosynthesis, and a reduction in aromatic compound degradation, suggesting that microbes are shifting to the preferential use of simple carbohydrates rather than more complex aromatic compounds. These results demonstrate that high levels of defoliation can affect headwater stream microbiomes to the point of altering stream ecosystem productivity and carbon cycling potential, highlighting the importance of incorporating broader ecological processes into spruce budworm management decisions.
Collapse
Affiliation(s)
- Madison L McCaig
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada
| | - Karen A Kidd
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
- School of Earth, Environment and Society, McMaster University, Hamilton, Ontario, Canada
| | - Emily E Smenderovac
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada
| | | | - Caroline E Emilson
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada
| | - Michael Stastny
- Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, Fredericton, New Brunswick, Canada
| | - Lisa Venier
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada
| | - Erik J S Emilson
- Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario, Canada
| |
Collapse
|
2
|
Bagagnan S, Guérin-Rechdaoui S, Rocher V, Alphonse V, Moilleron R, Jusselme MD. Spatial and temporal characteristics of microbial communities in the Seine river in the greater Paris area under anthropogenic perturbation. Heliyon 2024; 10:e30614. [PMID: 38726162 PMCID: PMC11079399 DOI: 10.1016/j.heliyon.2024.e30614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 05/12/2024] Open
Abstract
Microorganisms play an important role in maintaining the proper functioning of river ecosystems and are promising candidates for environmental indicators. They are also highly sensitive to environmental changes. It is necessary to have basic knowledge about them in order to know the ecological status of river ecosystem. To our knowglege, there is very little information on the status of microorganisms in surface water of the Seine River, although the Seine River is one of the rivers that suffers the greatest impact from humain activities in the world due to a weak dilution effect. It is therefore necessary to carry out a microbial analysis to assess the ecological status of the Seine River and to use it as a reference to compare with the future state when, for instance, new disinfection technologies of wastewater are implemented. To this end, the microbial communities of the Seine surface water were analyzed, taking into account the spatial effect, including the tributaries, and from upstream to downstream of the Paris conurbation and the temporal aspect, with a monitoring over 4 seasons. The results showed that the microbiome of the water is highly diverse and involved a variety of functions. The main phyla making up the surface water microbiome were Proteobacteria, Actinobacteriota, Firmicutes, Bacteroidota, while other minor phyla were Deinococcota, Patescibacteria, Gemmatimonadota, Cyanobacteria, Bdellovibrionota, Acidobacteriota, Campilobacterota, Myxococcota, and Desulfobacterota. Overall, the microbial community did not change spatially (with the exception of some minor differences between upstream and downstream), but did vary seasonally. The main factors influencing this microbiome were temperature, nitrate and orthophosphate concentrations. The main predicted functions were related to cell metabolism, in particular carbohydrates, amino acids, lipids, energy, vitamins and cofactors, and cell mobility. The microbial compositions showed a strong balance between microbial groups and were involved in the degradation of recalcitrant compounds.
Collapse
Affiliation(s)
| | | | - Vincent Rocher
- SIAAP, Direction de l’Innovation, F-92700, Colombes, France
| | | | | | | |
Collapse
|
3
|
Barbosa M, Lefler FW, Berthold DE, Gettys LA, Leary JK, Laughinghouse HD. Macrophyte coverage drives microbial community structure and interactions in a shallow sub-tropical lake. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 923:171414. [PMID: 38442760 DOI: 10.1016/j.scitotenv.2024.171414] [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: 11/03/2023] [Revised: 02/27/2024] [Accepted: 02/29/2024] [Indexed: 03/07/2024]
Abstract
Shallow lakes are typically dominated by macrophytes, which have important functional roles regulating trophic conditions and creating biological habitat. Macrophytes have been shown to strongly influence water chemistry and shape microbial communities in shallow lakes. In Florida, many large, shallow lakes are dominated by alien invasive, submersed macrophytes, such as hydrilla (Hydrilla verticillata [L.F.] Royle) and are intensively managed to reduce infestations and contain the spread of these alien invasive macrophytes. In this study, we investigated the effects of large (40 ha) herbicidal and mechanical control treatments on a large lake located in Central Florida that resulted in the reduction of Hydrilla and concomitant changes in water chemistry and microbial communities (both bacteria and protists [microbial eukaryotes]). We observed a considerable decrease in macrophyte coverage associated with plant control treatments as well as a temporal change in macrophyte coverage in Lake Tohopekaliga. We found that changes in macrophyte coverage, regardless of treatment type, significantly affected the water chemistry of the lake, resulting in a sharp increase of chlorophyll a concentration as well as an increase in turbidity with the decrease of macrophyte coverage. Moreover, the decline in macrophytes led to decreases in microbial community diversity with over-representation of phototrophic functional groups. Specifically, we observed an increase in cyanobacteria with the decrease in macrophyte coverage. Our study highlights the advantages and disadvantages of macrophyte control. Although there was an initial decrease in macrophyte coverage associated with the chemical and mechanical control of aquatic plants, after a few months, we found a considerable increase in coverage. In addition, the increase of cyanobacterial relative abundance demonstrates the possible consequences of aquatic plant control such as cyanobacterial blooms if there is a continued decline of macrophytes.
Collapse
Affiliation(s)
- Maximiliano Barbosa
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - Forrest W Lefler
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - David E Berthold
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - Lyn A Gettys
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - James K Leary
- UF/IFAS Center of Aquatic and Invasive Plants, University of Florida, 7922 NW 71 St, Gainesville, FL 32653, USA
| | - H Dail Laughinghouse
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Avenue, Davie, FL 33314, USA.
| |
Collapse
|
4
|
Liu B, Tian Z, Xie P, Guo F, Zhang W, Zhang J, Wu J, Zhu X, Song Z, Hu H, Zhu Y. Temporal and spatial dynamic changes of planktonic bacteria community structure in Li River, China: a seasonal survey. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:111244-111255. [PMID: 37814045 DOI: 10.1007/s11356-023-30166-8] [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: 04/25/2023] [Accepted: 09/26/2023] [Indexed: 10/11/2023]
Abstract
A combined temporal and spatial research approach helps us to evaluate the ecological status of a river scientifically and comprehensively. To understand the response mechanisms of bacteria in the Li River to different environments, we conducted a 1-year study (2020-2021) and collected water samples from 18 sections of the river in October, January, April, and August. 16S sequencing was used to study the composition and structure of bacterial communities in Li River at different temporal and spatial scales. The results showed that NO3--N, TP, T, pH, and DO were significantly different on spatial and temporal scales. Alpha diversity of planktonic bacteria in Li River fluctuated significantly with the season, reaching its highest in summer. Proteobacteria remained the most dominant phylum in all seasons, but the differential microorganisms varied between seasons. Although the abundance of metabolic functions of planktonic bacteria did not show significant differences between seasons, we found that DO, TP, T, and COD were the key environmental factors affecting bacterial metabolism. In addition, the co-occurrence network analysis showed that the autumn network had a higher number of nodes and edges and exhibited a high degree of complexity, while the summer network had the highest degree of modularity and exhibited greater stability. These results deepen our knowledge of the response mechanisms of river microorganisms to temporal and spatial changes and provide a scientific reference for the study of river ecosystems.
Collapse
Affiliation(s)
- Biao Liu
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China.
| | - Zeyuan Tian
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
| | - Penghao Xie
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Feng Guo
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Wenjun Zhang
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Junxia Zhang
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Junfeng Wu
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Xinfeng Zhu
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Zhongxian Song
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Hongwei Hu
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan, 467036, China
| | - Yichun Zhu
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China
| |
Collapse
|
5
|
Weigel B, Graco-Roza C, Hultman J, Pajunen V, Teittinen A, Kuzmina M, Zakharov EV, Soininen J, Ovaskainen O. Local eukaryotic and bacterial stream community assembly is shaped by regional land use effects. ISME COMMUNICATIONS 2023; 3:65. [PMID: 37365224 PMCID: PMC10293236 DOI: 10.1038/s43705-023-00272-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 05/30/2023] [Accepted: 06/14/2023] [Indexed: 06/28/2023]
Abstract
With anticipated expansion of agricultural areas for food production and increasing intensity of pressures stemming from land-use, it is critical to better understand how species respond to land-use change. This is particularly true for microbial communities which provide key ecosystem functions and display fastest responses to environmental change. However, regional land-use effects on local environmental conditions are often neglected, and, hence, underestimated when investigating community responses. Here we show that the effects stemming from agricultural and forested land use are strongest reflected in water conductivity, pH and phosphorus concentration, shaping microbial communities and their assembly processes. Using a joint species distribution modelling framework with community data based on metabarcoding, we quantify the contribution of land-use types in determining local environmental variables and uncover the impact of both, land-use, and local environment, on microbial stream communities. We found that community assembly is closely linked to land-use type but that the local environment strongly mediates the effects of land-use, resulting in systematic variation of taxon responses to environmental conditions, depending on their domain (bacteria vs. eukaryote) and trophic mode (autotrophy vs. heterotrophy). Given that regional land-use type strongly shapes local environments, it is paramount to consider its key role in shaping local stream communities.
Collapse
Affiliation(s)
- Benjamin Weigel
- Research Centre for Ecological Change, Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. 65, FI-00014, Helsinki, Finland.
- INRAE, EABX, 50 avenue de Verdun, 33612, Cestas, France.
| | - Caio Graco-Roza
- Laboratory of Ecology and Physiology of Phytoplankton, Department of Plant Biology, State University of Rio de Janeiro, Rua São Francisco Xavier 524, PHLC, Sala 511a, Rio de Janeiro, 20550-900, Brazil
- Department of Geosciences and Geography, University of Helsinki, PO, Box 64, FI-00014, Helsinki, Finland
| | - Jenni Hultman
- Soil Ecosystems, Natural Resources Institute Finland, Latokartanonkaari 9, 00790, Helsinki, Finland
| | - Virpi Pajunen
- Department of Geosciences and Geography, University of Helsinki, PO, Box 64, FI-00014, Helsinki, Finland
- Department of Built Environment, Aalto University, PO Box 11000, 00076 AALTO, Espoo, Finland
| | - Anette Teittinen
- Department of Geosciences and Geography, University of Helsinki, PO, Box 64, FI-00014, Helsinki, Finland
| | - Maria Kuzmina
- Centre for Biodiversity Genomics, University of Guelph, Guelph, ON, Canada
| | - Evgeny V Zakharov
- Centre for Biodiversity Genomics, University of Guelph, Guelph, ON, Canada
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Janne Soininen
- Department of Geosciences and Geography, University of Helsinki, PO, Box 64, FI-00014, Helsinki, Finland
| | - Otso Ovaskainen
- Research Centre for Ecological Change, Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. 65, FI-00014, Helsinki, Finland
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
- Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, N-7491, Trondheim, Norway
| |
Collapse
|
6
|
Barreto GG, Hepp LU, Rezende RDS, Gonçalves Junior JF, Moretti MDS, Moretto Y, Loureiro RC, Restello RM, Medeiros AO. The cooler the better: Increased aquatic hyphomycete diversity in subtropical streams along a neotropical latitudinal gradient. FUNGAL ECOL 2023. [DOI: 10.1016/j.funeco.2022.101223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
7
|
Hilderbrand RH, Bambakidis T, Crump BC. The Roles of Microbes in Stream Restorations. MICROBIAL ECOLOGY 2023; 85:853-861. [PMID: 36695828 DOI: 10.1007/s00248-023-02179-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 01/18/2023] [Indexed: 05/04/2023]
Abstract
The goods and services provided by riverine systems are critical to humanity, and our reliance increases with our growing population and demands. As our activities expand, these systems continue to degrade throughout the world even as we try to restore them, and many efforts have not met expectations. One way to increase restoration effectiveness could be to explicitly design restorations to promote microbial communities, which are responsible for much of the organic matter breakdown, nutrient removal or transformation, pollutant removal, and biomass production in river ecosystems. In this paper, we discuss several design concepts that purposefully create conditions for these various microbial goods and services, and allow microbes to act as ecological restoration engineers. Focusing on microbial diversity and function could improve restoration effectiveness and overall ecosystem resilience to the stressors that caused the need for the restoration. Advances in next-generation sequencing now allow the use of microbial 'omics techniques (e.g., metagenomics, metatranscriptomics) to assess stream ecological conditions in similar fashion to fish and benthic macroinvertebrates. Using representative microbial communities from stream sediments, biofilms, and the water column may greatly advance assessment capabilities. Microbes can assess restorations and ecosystem function where animals may not currently be present, and thus may serve as diagnostics for the suitability of animal reintroductions. Emerging applications such as ecological metatranscriptomics may further advance our understanding of the roles of specific restoration designs towards ecological services as well as assess restoration effectiveness.
Collapse
Affiliation(s)
- Robert H Hilderbrand
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, USA.
| | - Ted Bambakidis
- Department of Microbiology, Oregon State University, Corvallis, OR, USA
| | - Byron C Crump
- College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA
| |
Collapse
|
8
|
Determinants and Assembly Mechanism of Bacterial Community Structure in Ningxia Section of the Yellow River. Microorganisms 2023; 11:microorganisms11020496. [PMID: 36838461 PMCID: PMC9967387 DOI: 10.3390/microorganisms11020496] [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: 01/31/2023] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
The Yellow River is a valuable resource in the Ningxia Hui Autonomous Region and plays a vital role in local human activities and biodiversity. Bacteria are a crucial component of river ecosystems, but the driving factors and assembly mechanisms of bacterial community structure in this region remain unclear. Herein, we documented the bacterial community composition, determinants, co-occurrence pattern, and assembly mechanism for surface water and sediment. In comparison to sediment, the bacterioplankton community showed significant seasonal variation, as well as less diversity and abundance. The network topology parameters indicated that the sediment bacterial network was more stable than water, but the bacterioplankton network had higher connectivity. In this lotic ecosystem, CODMn, Chl a, and pH affected the structure of the bacterioplankton community, while TP was the primary factor influencing the structure of the sediment bacterial community. The combined results of the neutral community model and the phylogenetic null model indicate that Bacterial communities in both habitats were mainly affected by stochastic processes, with ecological processes dominated by ecological drift for bacterioplankton and dispersal limitation for sediment bacteria. These results provide essential insights into future research on microbial ecology, environmental monitoring, and classified management in the Ningxia section of the Yellow River.
Collapse
|
9
|
Wang H, Liu X, Wang Y, Zhang S, Zhang G, Han Y, Li M, Liu L. Spatial and temporal dynamics of microbial community composition and factors influencing the surface water and sediments of urban rivers. J Environ Sci (China) 2023; 124:187-197. [PMID: 36182129 DOI: 10.1016/j.jes.2021.10.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 09/15/2021] [Accepted: 10/11/2021] [Indexed: 06/16/2023]
Abstract
The temporal and spatial characteristics of urban river bacterial communities help us understand the feedback mechanism of bacteria to changes in the aquatic environment. The Fuhe River plays an important role in determining the water ecological environment of Baiyangdian Lake. 16S rRNA gene sequencing was used to study the microbial distribution characteristics in the Fuhe River in different seasons. The results showed that some environmental factors of the surface water (ammonia nitrogen (NH3-N), total nitrogen (TN), and total phosphorus (TP)) were different on the spatial and temporal scales. Moreover, there were no seasonal differences in the contents of TN, TP, total organic carbon (TOC), or heavy metals in the sediments. The distributions of Cyanobacteria, Actinomycetes and Firmicutes in the water and Actinomycetes and Planctomycetes in the sediments differed significantly among seasons (P < 0.05). There were significant spatial differences in bacteria in the surface water, with the highest abundance of Proteobacteria recorded in the river along with the highest nutrient concentration, while the abundance of Bacteroidetes was higher in the upstream than the downstream. Microbial communities in the water were most sensitive to temperature (T) and the TP concentration (P < 0.01). Moreover, differences in the bacterial community were better explained by the content of heavy metals in the sediments than by the chemical characteristics. A PICRUSt metabolic inference analysis showed that the effect of high summer temperatures on the enzyme action led to an increase in the abundances of the metabolic-related genes of the river microorganisms.
Collapse
Affiliation(s)
- Hongjie Wang
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Xingchun Liu
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Yali Wang
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Shengqi Zhang
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Guangming Zhang
- School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Yangyang Han
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Mengxiang Li
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China
| | - Ling Liu
- College of Ecology and Environment, Hebei University, Baoding 071002, China; Institute of Life Science and Green Development, Hebei University, Baoding 071002, China; Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Baoding 071002, China.
| |
Collapse
|
10
|
Burke RA, Fritz KM, Johnson BR, Price R. Mountaintop removal coal mining impacts on structural and functional indicators in Central Appalachian streams. FRONTIERS IN WATER 2023; 4:1-19. [PMID: 36969749 PMCID: PMC10031508 DOI: 10.3389/frwa.2022.988061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Mountaintop removal coal mining (MTR) has been a major source of landscape change in the Central Appalachians of the United States (US). Changes in stream hydrology, channel geomorphology and water quality caused by MTR coal mining can lead to severe impairment of stream ecological integrity. The objective of the Clean Water Act (CWA) is to restore and maintain the ecological integrity of the Nation's waters. Sensitive, readily measured indicators of ecosystem structure and function are needed for the assessment of stream ecological integrity. Most CWA assessments rely on structural indicators; inclusion of functional indicators could make these assessments more holistic and effective. The goals of this study were: (1) test the efficacy of selected carbon (C) and nitrogen (N) cycling and microbial structural and functional indicators for assessing MTR coal mining impacts on streams; (2) determine whether indicators respond to impacts in a predictable manner; and (3) determine if functional indicators are less likely to change than are structural indicators in response to stressors associated with MTR coal mining. The structural indicators are water quality and sediment organic matter concentrations, and the functional indicators relate to microbial activity and biofilm production. Seasonal measurements were conducted over the course of a year in streams draining small MTR-impacted and forested watersheds in the Twentymile Creek watershed of West Virginia (WV). Five of the eight structural parameters measured had significant responses, with all means greater in the MTR-impacted streams than in the forested streams. These responses resulted from changes in source or augmentation of the original source of the C and N structural parameters because of MTR coal mining. Nitrate concentration and the stable carbon isotopic ratio of dissolved inorganic carbon were the most effective indicators evaluated in this study. Only three of the fourteen functional indicators measured had significant responses to MTR coal mining, with all means greater in the forested streams than in the MTR-impacted streams. These results suggest that stressors associated with MTR coal mining caused reduction in some aspects of microbial cycling, but resource subsidies may have counterbalanced some of the inhibition leading to no observable change in most of the functional indicators. The detritus base, which is thought to confer functional stability, was likely sustained in the MTR-impacted streams by channel storage and/or leaf litter inputs from their largely intact riparian zones. Overall, our results largely support the hypothesis that certain functional processes are more resistant to stress induced change than structural properties but also suggest the difficulty of identifying suitable functional indicators for ecological integrity assessment.
Collapse
Affiliation(s)
- Roger A. Burke
- United States Environmental Protection Agency (USEPA),
Center for Environmental Measurement and Modeling (CEMM), Athens, GA, United
States
| | - Ken M. Fritz
- United States Environmental Protection Agency (USEPA),
Center for Environmental Measurement and Modeling (CEMM), Cincinnati, OH, United
States
| | - Brent R. Johnson
- United States Environmental Protection Agency (USEPA),
Center for Environmental Measurement and Modeling (CEMM), Cincinnati, OH, United
States
| | - Rachel Price
- United States Environmental Protection Agency (USEPA),
Center for Environmental Measurement and Modeling (CEMM), Cincinnati, OH, United
States
| |
Collapse
|
11
|
Camelo FRB, Tonin AM, Salgueiro L, Sena G, Braga I, Medeiros AO, Gonçalves Júnior JF. Tropical stream microcosms of isolated fungal species suggest nutrient enrichment does not accelerate decomposition but might inhibit fungal biomass production. FEMS Microbiol Lett 2022; 369:6843576. [PMID: 36416839 DOI: 10.1093/femsle/fnac113] [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: 02/21/2022] [Revised: 10/06/2022] [Accepted: 11/21/2022] [Indexed: 11/24/2022] Open
Abstract
Terrestrial leaf litter is an essential energy source in forest streams and in many tropical streams, including Cerrado, litter undergoes biological decomposition mainly by fungi. However, there is a limited understanding of the contribution of isolated fungal species to in-stream litter decomposition in the tropics. Here we set a full factorial microcosms experiment using four fungal species (Aquanectria penicillioides, Lunulospora curvula, Pestalotiopsis submerses, and Pestalotiopsis sp.) incubated in isolation, two litter types (rapid and slow decomposing litter) and two nutrient levels (natural and enriched), all characteristics of Cerrado streams, to elucidate the role of isolated fungal species on litter decomposition. We found that all fungal species promoted litter mass loss but with contributions that varied from 1% to 8% of the initial mass. The fungal species decomposed 1.5 times more the slow decomposing litter and water nutrient enrichment had no effect on their contribution to mass loss. In contrast, fungal biomass was reduced by nutrient enrichment and was different among fungal species. We showed fungal contribution to decomposition depends on fungal identity and litter type, but not on water nutrients. These findings suggest that the identity of fungal species and litter types may have more important repercussions to in-stream decomposition than moderate nutrient enrichment in the tropics.
Collapse
Affiliation(s)
| | - Alan M Tonin
- Department of Ecology, Institute of Biological Sciences, University of Brasília (UnB) 70910-900, Brasília, Brazil
| | - Laís Salgueiro
- Department of Ecology, Institute of Biological Sciences, University of Brasília (UnB) 70910-900, Brasília, Brazil
| | - Guilherme Sena
- Department of Ecology, Institute of Biological Sciences, University of Brasília (UnB) 70910-900, Brasília, Brazil
| | - Isabela Braga
- Department of Ecology, Institute of Biological Sciences, University of Brasília (UnB) 70910-900, Brasília, Brazil
| | - Adriana Oliveira Medeiros
- Laboratório de Microbiologia Ambiental Instituto de Biologia, Universidade Federal da Bahia 40170-115, Campus Ondina, Salvador, Brazil
| | | |
Collapse
|
12
|
Barbosa M, Lefler FW, Berthold DE, Briggs-Gonzalez VS, Mazzotti FJ, Laughinghouse HD. Trophic State Drives the Diversity of Protists in a Tropical River (New River, Belize). Microorganisms 2022; 10:microorganisms10122425. [PMID: 36557678 PMCID: PMC9782246 DOI: 10.3390/microorganisms10122425] [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: 11/15/2022] [Revised: 12/01/2022] [Accepted: 12/05/2022] [Indexed: 12/13/2022] Open
Abstract
Land use disrupts the ecosystem functioning of freshwater systems and significantly affects trophic state. Consequently, biodiversity is severely affected by changes to the ecosystem. Microbial eukaryotes (i.e., protists) play an essential role in ecosystem functioning, contributing to biogeochemical processes, nutrient cycling, and food webs. Protist composition is a useful biological quality parameter for monitoring aquatic ecosystems and determining aquatic system health. In this study, we investigated the effects of land usage and trophic state on the communities of microbial eukaryotes in the New River (Belize, C.A.). Land use and trophic state both significantly affected protist community compositions, with impacted and mesotrophic sampled sites having higher biodiversity when compared to other sites. Autotrophic organisms dominated indirectly impacted and eutrophic sites, while impacted and mesotrophic sites had proportional ratios of autotrophic and heterotrophic organisms. Our study highlights the significant effects of trophic gradients on protistan community composition, even at the local scales.
Collapse
Affiliation(s)
- Maximiliano Barbosa
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - Forrest W. Lefler
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - David E. Berthold
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - Venetia S. Briggs-Gonzalez
- Wildlife Ecology and Conservation Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - Frank J. Mazzotti
- Wildlife Ecology and Conservation Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
| | - H. Dail Laughinghouse
- Agronomy Department, Ft. Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA
- Correspondence:
| |
Collapse
|
13
|
Lee RM, Griffin N, Jones E, Abbott BW, Frei RJ, Bratsman S, Proteau M, Errigo IM, Shogren A, Bowden WB, Zarnetske JP, Aanderud ZT. Bacterioplankton dispersal and biogeochemical function across Alaskan Arctic catchments. Environ Microbiol 2022; 24:5690-5706. [PMID: 36273269 DOI: 10.1111/1462-2920.16259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Accepted: 10/21/2022] [Indexed: 01/12/2023]
Abstract
In Arctic catchments, bacterioplankton are dispersed through soils and streams, both of which freeze and thaw/flow in phase, seasonally. To characterize this dispersal and its potential impact on biogeochemistry, we collected bacterioplankton and measured stream physicochemistry during snowmelt and after vegetation senescence across multiple stream orders in alpine, tundra, and tundra-dominated-by-lakes catchments. In all catchments, differences in community composition were associated with seasonal thaw, then attachment status (i.e. free floating or sediment associated), and then stream order. Bacterioplankton taxonomic diversity and richness were elevated in sediment-associated fractions and in higher-order reaches during snowmelt. Families Chthonomonadaceae, Pyrinomonadaceae, and Xiphinematobacteraceae were abundantly different across seasons, while Flavobacteriaceae and Microscillaceae were abundantly different between free-floating and sediment-associated fractions. Physicochemical data suggested there was high iron (Fe+ ) production (alpine catchment); Fe+ production and chloride (Cl- ) removal (tundra catchment); and phosphorus (SRP) removal and ammonium (NH4 + ) production (lake catchment). In tundra landscapes, these 'hot spots' of Fe+ production and Cl- removal accompanied shifts in species richness, while SRP promoted the antecedent community. Our findings suggest that freshet increases bacterial dispersal from headwater catchments to receiving catchments, where bacterioplankton-mineral relations stabilized communities in free-flowing reaches, but bacterioplankton-nutrient relations stabilized those punctuated by lakes.
Collapse
Affiliation(s)
- Raymond M Lee
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Natasha Griffin
- College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvalis, Oregon, USA
| | - Erin Jones
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Benjamin W Abbott
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Rebecca J Frei
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada
| | - Samuel Bratsman
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Mary Proteau
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Isabella M Errigo
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| | - Arial Shogren
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, Alabama, USA
| | - William B Bowden
- The Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, Vermont, USA
| | - Jay P Zarnetske
- Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Zachary T Aanderud
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, Utah, USA
| |
Collapse
|
14
|
Zhao RZ, Zhang WJ, Zhang W, Zhao ZF, Qiu XC. A Preliminary Study of Bacterioplankton Community Structure in the Taiyangshan Wetland in Ningxia and Its Driving Factors. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:12224. [PMID: 36231526 PMCID: PMC9565018 DOI: 10.3390/ijerph191912224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/12/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
The Taiyangshan Wetland, a valuable wetland resource in the arid zone of central Ningxia, is critical for flood storage and drought resistance, climate regulation, and biodiversity protection. Nevertheless, the community structure and diversity of bacterioplankton in the Taiyangshan Wetland remains unclear. High-throughput sequencing was used to analyze the differences in bacterioplankton structure and major determinants in the Taiyangshan Wetland from April to October 2020. The composition and diversity of the bacterioplankton community varied significantly in different sampling periods but showed negligible differences across lake regions. Meanwhile, the relative abundances of bacterioplankton Bacteroidetes, Actinobacteria, Firmicutes, Chloroflexi, Tenericutes, Epsilonbacteraeota, and Patescibacteria were significantly different in different sampling periods, while the relative abundances of Cyanobacteria in different lake regions were quite different. Network analysis revealed that the topological attributes of co-occurrence pattern networks of bacterioplankton were high, and bacterioplankton community compositions were complicated in the month of July. A mantel test revealed that the bacterioplankton community in the entire wetland was affected by water temperature, electrical conductivity, dissolved oxygen, salinity, total nitrogen, ammonia nitrogen, chemical oxygen demand, fluoride, and sulfate. The bacterioplankton community structure was affected by ten environmental parameters (e.g., water temperature, dissolved oxygen, salinity, and permanganate index) in April, while the bacterioplankton community was only related to 1~2 environmental parameters in July and October. The bacterioplankton community structure in Lake Region IV was related to seven environmental parameters, including dissolved oxygen, pH, total nitrogen, and chemical oxygen demand, whereas the bacterioplankton community structures in the other three lake regions were related to two environmental parameters. This study facilitates the understanding of the bacterioplankton community in wetlands in arid areas and provides references to the evaluation of aquatic ecological management of the Taiyangshan Wetland.
Collapse
Affiliation(s)
- Rui-Zhi Zhao
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
| | - Wei-Jiang Zhang
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
| | - Wen Zhang
- Ningxia Supervision Institute for Veterinary Drugs and Animal Feedstuffs, Yinchuan 750004, China
| | - Zeng-Feng Zhao
- School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
| | - Xiao-Cong Qiu
- School of Life Science, Ningxia University, Yinchuan 750021, China
| |
Collapse
|
15
|
Pan B, Liu X, Chen Q, Sun H, Zhao X, Huang Z. Hydrological connectivity promotes coalescence of bacterial communities in a floodplain. Front Microbiol 2022; 13:971437. [PMID: 36212880 PMCID: PMC9532515 DOI: 10.3389/fmicb.2022.971437] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
Floodplains play essential roles in the ecological functions of regional environments. The merging and coalescence of bacterial communities in aquatic environments results in periodic patterns driven by regular hydrological activities, which may, in turn, influence ecological activities. However, the degree of bacterial community coalescence in the lateral and vertical directions as well as the underlying hydrological mechanism of floodplain ecosystems is poorly understood. Therefore, we investigated the spatiotemporal patterns and coalescence processes of planktonic and sedimentary bacterial communities during normal and high-water periods in a floodplain ecosystem of the Yellow River source region. We classified bacterial operational taxonomic units (OTUs) based on 16S rRNA gene sequencing, and quantified community coalescence by calculating the proportions of overlapping OTUs, the contributions of upstream sources to downstream sinks, and positive/negative cohesion. The results revealed major differences in the composition and diversity of planktonic and sedimentary bacterial communities. Bacterial community diversity in the high-water period was higher than in the normal period. Laterally, hydrological connectivity promoted the immigration and coalescence of bacterial communities to oxbow lakes in both the mainstream and tributaries, with the coalescence degree of planktonic bacteria (2.9%) higher than that of sedimentary bacteria (1.7%). Vertically, the coalescence degree of mainstream planktonic and sedimentary bacterial communities was highest, reaching 2.9%. Co-occurrence network analysis revealed that hydrological connectivity increased the complexity of the bacterial network and enhanced the coalescence of keystone species to oxbow lakes. Furthermore, community coalescence improved the competitiveness and dispersal of bacterial communities. This study demonstrated that coalescence of bacterial communities is driven by hydrological connectivity in a floodplain ecosystem. Further studies should investigate the processes of bacterial community coalescence in floodplains in more detail, which could provide new approaches for environmental protection and ecological function preservation.
Collapse
Affiliation(s)
- Baozhu Pan
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, Shaanxi, China
| | - Xinyuan Liu
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, Shaanxi, China
| | - Qiuwen Chen
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, China
- *Correspondence: Qiuwen Chen,
| | - He Sun
- State Key Laboratory of Crop Stress Biology in Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, China
| | - Xiaohui Zhao
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, Shaanxi, China
| | - Zhenyu Huang
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, Shaanxi, China
| |
Collapse
|
16
|
Jabiol J, Chauvet E, Guérold F, Bouquerel J, Usseglio-Polatera P, Artigas J, Margoum C, Le Dréau M, Moreira A, Mazzella N, Gouy V. The combination of chemical, structural, and functional indicators to evaluate the anthropogenic impacts on agricultural stream ecosystems. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:29296-29313. [PMID: 34647214 DOI: 10.1007/s11356-021-16925-5] [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: 04/12/2021] [Accepted: 10/03/2021] [Indexed: 06/13/2023]
Abstract
Freshwater contamination by pesticides in agricultural landscapes is of increasing concern worldwide, with strong pesticide impacts on biodiversity, ecosystem functions, and ultimately human health (drinking water, fishing). In addition, the excessively large number of substances, as well as their low - and temporally variable - concentrations in water, make the chemical monitoring by grab sampling very demanding and not fully representative of the actual contamination. Tools that integrate temporal variations and that are ecologically relevant are clearly needed to improve the monitoring of freshwater contamination and assess its biological effects. Here, we studied pesticide contamination and its biological impacts in 10 stream sections (sites) belonging to 3 agricultural catchments in France. In each site, we deployed a combination of pesticide integrative samplers, biocenotic indicators based on benthic macroinvertebrates, and functional indicators based on leaf litter decomposition and associated fungal communities. The 3 approaches largely proved complementary: structural and functional indicators did not respond equally to different agricultural impacts such as pesticide contamination (as revealed by integrative samplers), nutrients, or oxygen depletion. Combining chemical, structural, and functional indicators thus seems an excellent strategy to provide a comprehensive picture of agricultural impacts on stream ecosystems.
Collapse
Affiliation(s)
- Jérémy Jabiol
- HYFE (Hydrobiologie Et Fonctionnement Des Ecosystèmes), Elven, France.
- Laboratoire Ecologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, INPT, Toulouse, France.
- LIEC (Laboratoire Interdisciplinaire Des Environnements Continentaux), Université de Lorraine, CNRS, Metz, France.
- Laboratoire Microorganismes : Génome Et Environnement (LMGE), Université Clermont Auvergne, CNRS, Clermont-Ferrand, France.
| | - Eric Chauvet
- Laboratoire Ecologie Fonctionnelle et Environnement, Université de Toulouse, CNRS, INPT, Toulouse, France
| | - François Guérold
- LIEC (Laboratoire Interdisciplinaire Des Environnements Continentaux), Université de Lorraine, CNRS, Metz, France
| | - Jonathan Bouquerel
- LIEC (Laboratoire Interdisciplinaire Des Environnements Continentaux), Université de Lorraine, CNRS, Metz, France
| | - Philippe Usseglio-Polatera
- LIEC (Laboratoire Interdisciplinaire Des Environnements Continentaux), Université de Lorraine, CNRS, Metz, France
| | - Joan Artigas
- Laboratoire Microorganismes : Génome Et Environnement (LMGE), Université Clermont Auvergne, CNRS, Clermont-Ferrand, France
| | | | | | | | | | | |
Collapse
|
17
|
Hayer M, Wymore AS, Hungate BA, Schwartz E, Koch BJ, Marks JC. Microbes on decomposing litter in streams: entering on the leaf or colonizing in the water? THE ISME JOURNAL 2022; 16:717-725. [PMID: 34580429 PMCID: PMC8857200 DOI: 10.1038/s41396-021-01114-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 08/29/2021] [Accepted: 09/09/2021] [Indexed: 01/04/2023]
Abstract
When leaves fall in rivers, microbial decomposition commences within hours. Microbial assemblages comprising hundreds of species of fungi and bacteria can vary with stream conditions, leaf litter species, and decomposition stage. In terrestrial ecosystems, fungi and bacteria that enter soils with dead leaves often play prominent roles in decomposition, but their role in aquatic decomposition is less known. Here, we test whether fungi and bacteria that enter streams on senesced leaves are growing during decomposition and compare their abundances and growth to bacteria and fungi that colonize leaves in the water. We employ quantitative stable isotope probing to identify growing microbes across four leaf litter species and two decomposition times. We find that most of the growing fungal species on decomposing leaves enter the water with the leaf, whereas most growing bacteria colonize from the water column. Results indicate that the majority of bacteria found on litter are growing, whereas the majority of fungi are dormant. Both bacterial and fungal assemblages differed with leaf type on the dried leaves and throughout decomposition. This research demonstrates the importance of fungal species that enter with the leaf on aquatic decomposition and the prominence of bacteria that colonize decomposing leaves in the water.
Collapse
Affiliation(s)
- Michaela Hayer
- Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Adam S. Wymore
- grid.167436.10000 0001 2192 7145Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824 USA
| | - Bruce A. Hungate
- grid.261120.60000 0004 1936 8040Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011 USA
| | - Egbert Schwartz
- grid.261120.60000 0004 1936 8040Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011 USA
| | - Benjamin J. Koch
- grid.261120.60000 0004 1936 8040Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011 USA
| | - Jane C. Marks
- grid.261120.60000 0004 1936 8040Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011 USA
| |
Collapse
|
18
|
Spatial Variability in Streambed Microbial Community Structure across Two Watersheds. Microbiol Spectr 2021; 9:e0197221. [PMID: 34908462 PMCID: PMC8672884 DOI: 10.1128/spectrum.01972-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Both spatial and temporal variability are key attributes of sedimentary microbial communities, and while spatial effects on beta-diversity appear to dominate at larger distances, the character of spatial variability at finer scales remains poorly understood, especially for headwater stream communities. We investigated patterns of microbial community structure (MCS) in biofilms attached to streambed sediments from two watersheds across spatial scales spanning <1 m within a single stream to several hundred kilometers between watersheds. Analyses of phospholipid fatty acid (PLFA) profiles indicated that the variations in MCS were driven by increases in the relative abundance of microeukaryotic photoautotrophs and their contribution to total microbial biomass. Furthermore, streams within watersheds had similar MCS, underscoring watershed-level controls of microbial communities. Moreover, bacterial community structure assayed as either PCR-denaturing gradient gel electrophoresis (PCR-DGGE) fingerprints or PLFA profiles edited to remove microeukaryotes indicated a distinct watershed-level biogeography. No distinct stream order-level distributions were identified, although DGGE analyses clearly indicated that there was greater variability in community structure among 1st-order streams than among 2nd- and 3rd-order streams. Longitudinal gradients in microbial biomass and structure showed that the greatest variations were associated with 1st-order streams within a watershed, and 68% of the variation in total microbial biomass was explained by sediment atomic carbon-to-nitrogen ratio (C:N ratio), percent carbon, sediment surface area, and percent water content. This study confirms a distinct microbial biogeography for headwater stream communities driven by environmental heterogeneity across distant watersheds and suggests that eukaryotic photoautotrophs play a key role in structuring bacterial communities on streambed sediments. IMPORTANCE Microorganisms in streams drive many biogeochemical reactions of global significance, including nutrient cycling and energy flow; yet, the mechanisms responsible for the distribution and composition of streambed microbial communities are not well known. We sampled sediments from multiple streams in two watersheds (Neversink River [New York] and White Clay Creek [WCC; Pennsylvania] watersheds) and measured microbial biomass and total microbial and bacterial community structures using phospholipid and molecular methods. Microbial and bacterial community structures displayed a distinct watershed-level biogeography. The smallest headwater streams within a watershed showed the greatest variation in microbial biomass, and 68% of that variation was explained by the atomic carbon-to-nitrogen ratio (C:N ratio), percent carbon, sediment surface area, and percent water content. Our study revealed a nonrandom distribution of microbial communities in streambeds, and showed that microeukaryotic photoautotrophs, environmental heterogeneity, and geographical distance influence microbial composition and spatial distribution.
Collapse
|
19
|
Passive Treatment for Acid Mine Drainage Partially Restores Microbial Community Structure in Different Stream Habitats. WATER 2021. [DOI: 10.3390/w13223300] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The assessment of the degree to which biological communities in streams impaired by acid mine drainage (AMD) are restored by passive treatment has focused primarily on eukaryotic-cell organisms and microbial processes. The responses of microbial community structure to passive treatment have received much less attention, even though functional processes such as nutrient cycling and organic matter decomposition depend on taxonomic composition. Our objective was to determine the degree to which passive treatment restored microbial communities in three types of habitats: aqueous, leaf, and sediment. To assess their recovery, we compared the community composition in these habitats based on 16S rRNA gene sequencing at three different stream sites: an untreated AMD site (U), a remediated site below AMD passive treatment (T), and an unimpaired reference site (R). The acidity, conductivity, and soluble metal concentrations at T were found to be elevated compared to R, but generally 1–2 orders of magnitude less than at U. Microbial community composition was found to be synergistically affected by habitat type and AMD impact, with the similarity among communities in the three habitats increasing with the severity of the AMD. Sediment- and leaf-associated microbial communities at U were characterized by taxa that are tolerant to severe AMD. The absence of the nitrogen oxidizing bacterium Nitrospira in sediment communities at T and U was found to correspond to higher NH4+ concentrations compared to R, possibly because of the presence of iron oxyhydroxide precipitate. In contrast, the microbial composition was found to be similar between the T and R sites for both aqueous and leaf communities, indicating that passive treatment was more able to restore these communities to the reference condition than sediment communities. The remediation of AMD streams should consider the habitat-specific responses of microbial community composition and be guided by future studies that empirically couple changes in taxonomic composition to measured functional processes.
Collapse
|
20
|
Sun H, Pan B, He H, Zhao G, Jiang X, Han X, Wang H. Characterization of the bacterioplankton community and the influencing factors in the upper reaches of the Han River basin. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:61748-61759. [PMID: 34189692 DOI: 10.1007/s11356-021-14906-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Accepted: 06/10/2021] [Indexed: 06/13/2023]
Abstract
The upper reaches of the Han River are the source region of water for the Middle Route of China's South-to-North Water Diversion Project, mainly for household, industrial, and irrigation purposes. Planktonic bacteria are more sensitive than macroorganisms to water physical and chemical properties and play a critical role in biogeochemical processes in river ecosystems. In November 2017 and April 2018, a systematic and methodical survey was carried out to evaluate the water quality and bacterial communities, on the mainstem of the Han River and its five main tributaries. In this study, high-throughput sequencing technology has been employed to investigate the bacterioplankton community composition. The results indicated the following: (1) diversity increased downstream, especially in the upper reaches of the Han River. (2) The relative abundance of Actinobacteria increased with the increase of river length, while that of Bacteroidetes decreased slightly. (3) Five tributaries were found to be importance sources of taxa to the Han River; however, in both months, a large proportion of operational taxonomic units (37.84% and 36.34%, respectively) had unknown sources. (4) Finally, redundancy analysis (RDA) and Bioenv analysis showed that environmental parameters (pH, TN, Cond, NH4+-N, DO, NO2--N, Chl-a, and T) had a great influence (p ≤ 0.05) on the bacterioplankton community. These research results are beneficial for the managing the ecological system, protecting the tributary biodiversity, and conserving the mainstem and tributaries of the Han River basin.
Collapse
Affiliation(s)
- He Sun
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| | - Baozhu Pan
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China.
| | - Haoran He
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| | - Gengnan Zhao
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| | - Xiaoming Jiang
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| | - Xu Han
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| | - Hao Wang
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China
| |
Collapse
|
21
|
Doering M, Freimann R, Antenen N, Roschi A, Robinson CT, Rezzonico F, Smits THM, Tonolla D. Microbial communities in floodplain ecosystems in relation to altered flow regimes and experimental flooding. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 788:147497. [PMID: 34134395 DOI: 10.1016/j.scitotenv.2021.147497] [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: 12/20/2020] [Revised: 04/10/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
River floodplains are spatially diverse ecosystems that respond quickly to flow variations and disturbance. However, it remains unclear how flow alteration and hydrological disturbance impacts the structure and biodiversity of complex microbial communities in these ecosystems. Here, we examined the spatial and seasonal dynamics of microbial communities in aquatic (benthic) and terrestrial habitats of three hydrologically contrasting (natural flow, residual flow, hydropeaking flow) floodplain systems. Microbial communities (alpha and beta diversity) differed more among floodplain habitats than between riverine floodplains. Microbial communities in all systems displayed congruent seasonal effects. In the residual and hydropeaking systems, an experimental flood was released from a reservoir to mimic a natural high flow event causing hydromorphological disturbance. The experimental flood caused a temporary shift in microbial communities by releasing microbes from the reservoir as well as redistributing communities among floodplain habitats. The flood-mediated shift in community structures had only a transient impact as pelagic bacteria did not persist within floodplain habitats over time after the flood. More frequent pulse disturbances might lead to an alternate structure of bacterial communities in floodplains over time.
Collapse
Affiliation(s)
- Michael Doering
- Ecohydrology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland; eQcharta GmbH, Wädenswil, Switzerland.
| | - Remo Freimann
- Institute of Molecular Health Science, ETH Zürich, Switzerland
| | - Nadine Antenen
- Ecohydrology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland
| | - Alexia Roschi
- Ecohydrology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland; Environmental Genomics and Systems Biology Research Group, Institute for Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland
| | - Christopher T Robinson
- Swiss Federal Institute of Aquatic Science and Technology (EAWAG), 8600 Dübendorf, Switzerland; Institute of Integrative Biology, ETH Zürich, 8092 Zürich, Switzerland
| | - Fabio Rezzonico
- Environmental Genomics and Systems Biology Research Group, Institute for Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland
| | - Theo H M Smits
- Environmental Genomics and Systems Biology Research Group, Institute for Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland
| | - Diego Tonolla
- Ecohydrology Research Group, Institute of Natural Resource Sciences, Zurich University of Applied Sciences (ZHAW), Wädenswil, Switzerland; eQcharta GmbH, Wädenswil, Switzerland
| |
Collapse
|
22
|
Wang X, Wang P, Wang C, Chen J, Hu B, Liu S, Yuan Q. Distinct strategies of abundant and rare bacterioplankton in river-reservoir system: Evidence from a 2800 km plateau river. ENVIRONMENTAL RESEARCH 2021; 199:111418. [PMID: 34052244 DOI: 10.1016/j.envres.2021.111418] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 04/29/2021] [Accepted: 05/24/2021] [Indexed: 06/12/2023]
Abstract
Riverine bacterioplankton are highly responsive to river alterations and their abundant and rare sub-communities may have different roles in biogeochemical cycling. However, with the rapid development of dam constructions, our knowledge on adaptation mechanism of these sub-communities in regulated river ecosystem was still limited, especially with regard to their functional traits. Here, our study was conducted in the 2800 km Yarlung Tsangpo River on the Tibetan Plateau to address the question of how abundant and rare bacterioplankton would respond taxonomically and functionally to river damming using 16S rRNA gene sequencing combined with Geochip microarray technique. Our results showed that abundant sub-community dominated taxonomic composition while rare sub-community largely determined functional composition. It is also observed that taxonomic diversity of abundant sub-community was significantly stimulated in the reservoir while that of rare sub-community was markedly inhibited. Moreover, abundant sub-community exhibited functional redundancy under damming disturbances since altered taxonomic composition and unaltered functional composition co-occurred simultaneously. Meanwhile, due to portfolio effect, rare sub-community maintained a greater stability under damming disturbances with little variation in taxonomic and functional compositions. In addition, the Stegen null model analysis revealed that stochastic process governed community assembly in both abundant and rare sub-communities. However, according to source tracking analysis, the taxonomic dispersion of abundant sub-community was less significantly impeded by the dam while the functional dispersion of rare sub-community was less strongly interrupted, indicating that the dispersal process in the dominated sub-community was less susceptible to damming. Therefore, by considering bacterioplankton functional traits, our study provided comprehensive evidences for the distinct strategies of abundant and rare sub-communities in response to damming.
Collapse
Affiliation(s)
- Xun Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Juan Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Bin Hu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Sheng Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Qiusheng Yuan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| |
Collapse
|
23
|
Cai X, Yao L, Sheng Q, Jiang L, Wang T, Dahlgren RA, Deng H. Influence of a biofilm bioreactor on water quality and microbial communities in a hypereutrophic urban river. ENVIRONMENTAL TECHNOLOGY 2021; 42:1452-1460. [PMID: 31539312 DOI: 10.1080/09593330.2019.1670267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 09/14/2019] [Indexed: 06/10/2023]
Abstract
Biofilms play an important role in degradation, transformation and assimilation of anthropogenic pollutants in aquatic ecosystems. In this study, we assembled a tubular bioreactor containing a biofilm substrate and aeration device, which was introduced into mesocosms to explore the effects of bioreactor on physicochemical and microbial characteristics of a hypereutrophic urban river. The biofilm bioreactor greatly improved water quality, especially by decreasing dissolved inorganic nitrogen (DIN) concentrations, suggesting that biofilms were the major sites of nitrification and denitrification with an oxygen concentration gradient. The biofilm bioreactor increased the abundance of planktonic bacteria, whereas diversity of the planktonic microbial community decreased. Sequencing revealed that Proteobacteria, Bacteroidetes, Planctomycetes, and Actinobacteria were the four predominant phyla in the planktonic microbial community, and the presence of the biofilm bioreactor increased the relative abundance of Proteobacteria. Variations in microbial communities were most strongly affected by the presence of the biofilm bioreactor, as indicated by principal component analysis (PCA) and redundancy analysis (RDA). This study provides valuable insights into changes in ecological characteristics associated with self-purification processes in hypereutrophic urban rivers, and may be of important for the application of biofilm bioreactor in natural urban river.
Collapse
Affiliation(s)
- Xianlei Cai
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
- Southern Zhejiang Water Research Institute, Wenzhou, People's Republic of China
| | - Ling Yao
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Qiyue Sheng
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Luyao Jiang
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Ting Wang
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
- Southern Zhejiang Water Research Institute, Wenzhou, People's Republic of China
| | - Randy A Dahlgren
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
- Department of Land, Air and Water Resources, University of California, Davis, CA, USA
| | - Huanhuan Deng
- Zhejiang Provincial Key Laboratory of Watershed Science and Health, Wenzhou Medical University, Wenzhou, People's Republic of China
- Southern Zhejiang Water Research Institute, Wenzhou, People's Republic of China
| |
Collapse
|
24
|
Zhang L, Wang Z, Cai H, Lu W, Li J. Long-term agricultural contamination shaped diversity response of sediment microbiome. J Environ Sci (China) 2021; 99:90-99. [PMID: 33183720 DOI: 10.1016/j.jes.2020.06.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 06/09/2020] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
The pollution caused by agricultural production poses a threat to the ecological integrity of river ecosystems, altering the structure and function of river ecosystems. Differences in microbial community structure provide useful information about the impact of agricultural pollution on the biological integrity of ecosystems, but generally convey little information regarding ecosystem functions. In this study, using Illumina MiSeq sequencing technology based on the 16S rRNA gene, river sediment samples associated with four different types of agricultural pollution were comprehensively analyzed. The results show that the total organic carbon (TOC) content was highest at the YZS site (animal husbandry sewage) among the assayed sites, but the species richness and uniformity were lowest at this site, which may have been caused by the high nutrient source of the sewage. Furthermore, in the three YZS samples affected by the long-term discharge of aquaculture tail-water, the unique genus Dechloromonas and the genus Candidatus-Competitor were observed, which are strongly correlated with phosphorus conversion. The formation of network modules may correspond to the coexistence of functional bacteria accustomed to multiple niche combinations under different agricultural pollution conditions in river sediments. According to the PICRUSt functional prediction, the bacterial community in the agricultural polluted river sediment primarily harbored 46 subfunctions, exhibiting richness of functions. Overall, our results provide a more comprehensive understanding of the structure and ecological processes associated with the aggregation of bacterial communities, which is beneficial for the management of river environments.
Collapse
Affiliation(s)
- Lei Zhang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China; Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Ziyin Wang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Hua Cai
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Wenxuan Lu
- Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230036, China
| | - Jing Li
- Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230036, China
| |
Collapse
|
25
|
Wang X, Wang P, Wang C, Chen J, Miao L, Yuan Q, Liu S, Feng T. Do bacterioplankton respond equally to different river regulations? A quantitative study in the single-dammed Yarlung Tsangpo River and the cascade-dammed Lancang River. ENVIRONMENTAL RESEARCH 2020; 191:110194. [PMID: 32919971 DOI: 10.1016/j.envres.2020.110194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/22/2020] [Accepted: 09/06/2020] [Indexed: 06/11/2023]
Abstract
River damming has raised controversial concerns as it simultaneously contributes to socioeconomic development but may jeopardize aquatic ecology. Since bacterioplankton catalyze vital biogeochemical reactions and play important roles in aquatic ecosystems, more attention has been paid to their responses in dammed rivers. Here, a comparative study was conducted between single-dammed (the Yarlung Tsangpo River) and cascade-dammed (the Lancang River) rivers in Southwest China to investigate whether bacterioplankton respond equally to different river regulations. Our results showed that the decreased bacterioplankton abundance and the increased α-diversity always co-occurred in reservoirs of the Yarlung Tsangpo River and the Lancang River. However, the impact of damming on bacterioplankton abundance and α-diversity were resilient in the Lancang River, which can be attributed to the repeated alterations of environmental heterogeneity in cascade damming reaches. Meanwhile, a generalized additive model (GAM) was applied to identify the important drivers affecting bacterioplankton variation. The abundance was influenced by trophic conditions, such as dissolved silicon, while α-diversity was closely related to the microbial dispersal process, such as elevation and distance-from source. And it is also noted that the bacterioplankton dispersal process was interrupted in cascade damming reaches. In addition, based on their important drivers, variations in abundance and α-diversity were also predicted by GAM. As revealed by the quantitative mutual validation between the two rivers, abundance and α-diversity in the cascade-dammed river can be predicted by their response to single-dammed river, suggesting that the impact of cascade damming on bacterioplankton can be pre-assessed by referring to the single stage damming effect. Therefore, our study provides the first trial of quantitative evidence that bacterioplankton do not respond equally to different river regulations, and the impact of cascade damming on bacterioplankton can be predicted based on single stage damming effect, which can contribute to the protection of aquatic ecology in the cascade hydropower development.
Collapse
Affiliation(s)
- Xun Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Juan Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Lingzhan Miao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Qiusheng Yuan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Sheng Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Tao Feng
- Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada
| |
Collapse
|
26
|
Jones EF, Griffin N, Kelso JE, Carling GT, Baker MA, Aanderud ZT. Stream Microbial Community Structured by Trace Elements, Headwater Dispersal, and Large Reservoirs in Sub-Alpine and Urban Ecosystems. Front Microbiol 2020; 11:491425. [PMID: 33324353 PMCID: PMC7726219 DOI: 10.3389/fmicb.2020.491425] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 11/04/2020] [Indexed: 01/09/2023] Open
Abstract
Stream bacterioplankton communities, a crucial component of aquatic ecosystems and surface water quality, are shaped by environmental selection (i.e., changes in taxa abundance associated with more or less favorable abiotic conditions) and passive dispersal (i.e., organisms' abundance and distribution is a function of the movement of the water). These processes are a function of hydrologic conditions such as residence time and water chemistry, which are mediated by human infrastructure. To quantify the role of environmental conditions, dispersal, and human infrastructure (dams) on stream bacterioplankton, we measured bacterioplankton community composition in rivers from sub-alpine to urban environments in three watersheds (Utah, United States) across three seasons. Of the 53 environmental parameters measured (including physicochemical parameters, solute concentrations, and catchment characteristics), trace element concentrations explained the most variability in bacterioplankton community composition using Redundancy Analysis ordination. Trace elements may correlate with bacterioplankton due to the commonality in source of water and microorganisms, and/or environmental selection creating more or less favorable conditions for bacteria. Bacterioplankton community diversity decreased downstream along parts of the stream continuum but was disrupted where large reservoirs increased water residence time by orders of magnitude, potentially indicating a shift in the relative importance of environmental selection and dispersal at these sites. Reservoirs also had substantial effects on community composition, dissimilarity (Bray-Curtis distance) and species interactions as indicated by co-occurrence networks. Communities downstream of reservoirs were enriched with anaerobic Sporichthyaceae, methanotrophic Methylococcaceae, and iron-transforming Acidimicrobiales, suggesting alternative metabolic pathways became active in the hypolimnion of large reservoirs. Our results identify that human activity affects river microbial communities, with potential impacts on water quality through modified biogeochemical cycling.
Collapse
Affiliation(s)
- Erin Fleming Jones
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, United States
| | - Natasha Griffin
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, United States
| | - Julia E. Kelso
- Department of Biology and the Ecology Center, Utah State University, Logan, UT, United States
| | - Gregory T. Carling
- Department of Geological Sciences, Brigham Young University, Provo, UT, United States
| | - Michelle A. Baker
- Department of Biology and the Ecology Center, Utah State University, Logan, UT, United States
| | - Zachary T. Aanderud
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, United States
| |
Collapse
|
27
|
Fernandes G, Bastos MC, de Vargas JPR, Le Guet T, Clasen B, Dos Santos DR. The use of epilithic biofilms as bioaccumulators of pesticides and pharmaceuticals in aquatic environments. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:1293-1305. [PMID: 32740705 DOI: 10.1007/s10646-020-02259-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
Biofilms are a consortium of communities of organisms that live in syntrophic relationships and present a higher organization level than that of individual cells. Biofilms dominate microbial life in streams and rivers, enable crucial ecosystem processes, contribute to global biogeochemical flows and represent the main active bacterial life form. Epilithic biofilms are the main biomass found in rivers; their exposure to contaminants can lead to changes in their structure and composition. The composition of these communities is influenced by physicochemical factors, temperature, light and prior exposure to pollutants, among other factors, and it can be used for water quality monitoring purposes. The heterogenous composition of biofilms enables them to accumulate compounds in an integrative manner. Moreover, the availability of several sorption sites and their likely saturation can contribute to bioaccumulation. In aquatic environments, biofilms are also susceptible to the acquisition of antibiotic resistance genes and participate in their dissemination. Anthropic pressure intensification processes continuously expose water resources and, consequently, biofilm communities to different contamination sources. Therefore, the use of biofilms to indicate environmental pollution is reinforced by the progress of studies on the subject. Biofilm communities' response to pollutants in aquatic environments can be mainly influenced by the presence of different organisms, which may change due to community development or age. The current research aims to review studies about biofilm contamination and highlight the importance of biofilm use to better evaluate and maintain the quality of water bodies.
Collapse
Affiliation(s)
- Gracieli Fernandes
- Centro de Ciências Rurais, Departamento de Solos, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Bairro Camobi, CEP 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| | | | - Jocelina Paranhos Rosa de Vargas
- Centro de Ciências Rurais, Departamento de Solos, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Bairro Camobi, CEP 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| | | | - Barbara Clasen
- Universidade Estadual do Rio Grande do Sul, Três Passos, Rio Grande do Sul, Brazil.
- Programa de Pós-Graduação em Engenharia Ambiental, Centro de Tecnologia, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
| | - Danilo Rheinheimer Dos Santos
- Centro de Ciências Rurais, Departamento de Solos, Universidade Federal de Santa Maria, Avenida Roraima, 1000, Bairro Camobi, CEP 97105-900, Santa Maria, Rio Grande do Sul, Brazil
| |
Collapse
|
28
|
Retelletti Brogi S, Balestra C, Casotti R, Cossarini G, Galletti Y, Gonnelli M, Vestri S, Santinelli C. Time resolved data unveils the complex DOM dynamics in a Mediterranean river. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 733:139212. [PMID: 32446062 DOI: 10.1016/j.scitotenv.2020.139212] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 05/02/2020] [Accepted: 05/02/2020] [Indexed: 06/11/2023]
Abstract
In this study, dissolved organic carbon (DOC) data and optical properties (absorbance and fluorescence) of DOM, weekly collected in the Arno River for 2 years, are used to investigate the main processes determining DOM temporal dynamics in a small Mediterranean river, with torrential hydrology and medium-high human impact, and to quantify the contribution of this river to Med Sea carbon budget. A clear seasonal cycle of DOM, with DOC values ranging between 170 and 490 μM, was observed. Optical properties indicates that DOM quality in the river is different depending on the season; terrestrial humic-like substances prevail in winter, when discharge and floods are the main drivers of DOM concentration and quality, whereas autochthonous protein-like substances prevail in spring and summer, when biological processes dominate. Our results provide a robust estimate of the DOC flux to the Med Sea (9.6 · 109 g DOC yr-1) and of its range of variability (12.95 · 109-5.12 · 109 g DOC yr-1). The 80% of this flux was generally delivered during autumn/winter with significant amounts ascribed to single flood events (up to 26% in 2014). This study, by providing a rich dataset on water quantity and quality and by quantifying the importance of the hydrological regime on DOC transport, represents an important step toward a quantitative modeling of the Arno River.
Collapse
Affiliation(s)
| | - Cecilia Balestra
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples 80121, Italy
| | | | - Gianpiero Cossarini
- Istituto Nazionale di Oceanografia e Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/C, 34010 Sgonico, (TS), Italy
| | - Yuri Galletti
- Istituto di Biofisica, CNR, Via G. Moruzzi, Pisa 56124, Italy
| | | | - Stefano Vestri
- Istituto di Biofisica, CNR, Via G. Moruzzi, Pisa 56124, Italy
| | | |
Collapse
|
29
|
Hilderbrand RH, Keller SR, Laperriere SM, Santoro AE, Cessna J, Trott R. Microbial communities can predict the ecological condition of headwater streams. PLoS One 2020; 15:e0236932. [PMID: 32745120 PMCID: PMC7398514 DOI: 10.1371/journal.pone.0236932] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 07/17/2020] [Indexed: 11/22/2022] Open
Abstract
Humanity’s reliance on clean water and the ecosystem services provided makes identifying efficient and effective ways to assess the ecological condition of streams ever more important. We used high throughput sequencing of the 16S rRNA region to explore relationships between stream microbial communities, environmental attributes, and assessments of stream ecological condition. Bacteria and archaea in microbial community samples collected from the water column and from stream sediments during spring and summer were used to replicate standard assessments of ecological condition performed with benthic macroinvertebrate collections via the Benthic Index of Biotic Integrity (BIBI). Microbe-based condition assessments were generated at different levels of taxonomic resolution from phylum to OTU (Operational Taxonomic Units) in order to understand appropriate levels of taxonomic aggregation. Stream sediment microbial communities from both spring and summer were much better than the water column at replicating BIBI condition assessment results. Accuracies were as high as 100% on training data used to build the models and up to 80% on validation data used to assess predictions. Assessments using all OTUs usually had the highest accuracy on training data, but were lower on validation data due to overfitting. In contrast, assessments at the order-level had similar performance accuracy for validation data, and a reduced subset of orders also performed well, suggesting the method could be generalized to other watersheds. Subsets of the important orders responded similarly to environmental gradients compared to the entire community, where strong shifts in community structure occurred for known aquatic stressors such as pH, dissolved organic carbon, and nitrate nitrogen. The results suggest the stream microbes may be useful for assessing the ecological condition of streams and especially useful for stream restorations where many eukaryotic taxa have been eliminated due to prior degradation and are unable to recolonize.
Collapse
Affiliation(s)
- Robert H. Hilderbrand
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States of America
- * E-mail:
| | - Stephen R. Keller
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States of America
| | - Sarah M. Laperriere
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, United States of America
- Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA, United States of America
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States of America
| | - Alyson E. Santoro
- Horn Point Laboratory, University of Maryland Center for Environmental Science, Cambridge, MD, United States of America
- Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA, United States of America
| | - Jason Cessna
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States of America
| | - Regina Trott
- Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, United States of America
| |
Collapse
|
30
|
Kühmayer T, Guo F, Ebm N, Battin TJ, Brett MT, Bunn SE, Fry B, Kainz MJ. Preferential retention of algal carbon in benthic invertebrates: Stable isotope and fatty acid evidence from an outdoor flume experiment. FRESHWATER BIOLOGY 2020; 65:1200-1209. [PMID: 32612313 PMCID: PMC7317824 DOI: 10.1111/fwb.13492] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 12/09/2019] [Accepted: 02/04/2020] [Indexed: 05/21/2023]
Abstract
According to the River Continuum Concept, headwater streams are richer in allochthonous (e.g. terrestrial leaves) than autochthonous (e.g. algae) sources of organic matter for consumers. However, compared to algae, leaf litter is of lower food quality, particularly ω-3 polyunsaturated fatty acids (n-3 PUFA), and would constrain the somatic growth, maintenance, and reproduction of stream invertebrates. It may be thus assumed that shredders, such as Gammarus, receive lower quality diets than grazers, e.g. Ecdyonurus, that typically feed on algae.The objective of this study was to assess the provision of dietary PUFA from leaf litter and algae to the shredder Gammarus and the grazer Ecdyonurus. Three different diets (algae, terrestrial leaves, and an algae-leaf litter mix) were supplied to these macroinvertebrates in a flume experiment for 2 weeks. To differentiate how diet sources were retained in these consumers, algae were isotopically labelled with 13C.Both consumers became enriched with 13C in all treatments, demonstrating that both assimilated algae. For Gammarus, n-3 PUFA increased, whereas n-6 PUFA stayed constant. By contrast, the n-3 PUFA content of Ecdyonurus decreased as a consequence of declining algal supply.Results from compound-specific stable isotope analysis provided evidence that the long-chain n-3 PUFA eicosapentaenoic acid (EPA) in both consumers was more enriched in 13C than the short-chain n-3 PUFA α-linolenic acid, suggesting that EPA was taken up directly from algae and not from heterotrophic biofilms on leaf litter. Both consumers depended on algae as their carbon and EPA source and retained their EPA from high-quality algae.
Collapse
Affiliation(s)
- Thomas Kühmayer
- Department of Limnology and OceanographyUniversity of ViennaWienAustria
- WasserCluster Lunz – Inter‐University Center for Aquatic Ecosystems ResearchLunz am SeeAustria
| | - Fen Guo
- WasserCluster Lunz – Inter‐University Center for Aquatic Ecosystems ResearchLunz am SeeAustria
- Simon F.S. Li Marine Science LaboratorySchool of Life SciencesThe Chinese University of Hong KongHong KongChina
| | - Nadine Ebm
- Department of Limnology and OceanographyUniversity of ViennaWienAustria
- WasserCluster Lunz – Inter‐University Center for Aquatic Ecosystems ResearchLunz am SeeAustria
| | - Tom J. Battin
- Stream Biofilm and Ecosystem Research LaboratoryÉcole Polytechnique Fédérale de LausanneLausanneSwitzerland
| | - Michael T. Brett
- Department of Civil EngineeringUniversity of WashingtonSeattleWAUSA
| | - Stuart E. Bunn
- Australian Rivers InstituteGriffith UniversityBrisbaneQldAustralia
| | - Brian Fry
- Australian Rivers InstituteGriffith UniversityBrisbaneQldAustralia
| | - Martin J. Kainz
- WasserCluster Lunz – Inter‐University Center for Aquatic Ecosystems ResearchLunz am SeeAustria
| |
Collapse
|
31
|
Payne AT, Davidson AJ, Kan J, Peipoch M, Bier R, Williamson K. Widespread cryptic viral infections in lotic biofilms. Biofilm 2019; 2:100016. [PMID: 33447802 PMCID: PMC7798469 DOI: 10.1016/j.bioflm.2019.100016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 11/06/2019] [Accepted: 11/29/2019] [Indexed: 12/01/2022] Open
Abstract
Viruses have important impacts on aquatic microbial ecology and have been studied at length in the global ocean. However, the roles of bacteriophages in lotic ecosystems, particularly in benthic biofilms, have been largely under-studied. The main goals of this work were to determine whether viruses are consistent members of natural benthic biofilm communities of freshwater streams; whether temperate phages are present and active in such biofilms; and whether community profiling approaches like RAPD-PCR can be adapted to characterize biofilm virus communities. Results from both field and laboratory experiments suggest that viruses are consistent members of lotic biofilm communities. Interestingly, prophage induction was statistically significant but only a small percentage of the total bacterial population appeared to harbor prophage or engaged in induction. Finally, while the use of RAPD-PCR for the community level profiling of biofilm viral communities suggests temporal change in response to biofilm maturity, further refinements are required for broad-scale quantitative application.
Collapse
Affiliation(s)
| | | | - Jinjun Kan
- Stroud Water Research Center, 970 Spencer Rd, Avondale, PA, 19311, USA
| | - Marc Peipoch
- Stroud Water Research Center, 970 Spencer Rd, Avondale, PA, 19311, USA
| | - Raven Bier
- Stroud Water Research Center, 970 Spencer Rd, Avondale, PA, 19311, USA
| | | |
Collapse
|
32
|
Fletcher DE, Lindell BE, Lindell AH, Stankus PT, Fletcher ND, McArthur JV, Seaman JC. Basins, beaver ponds, and the storage and redistribution of trace elements in an industrially impacted coastal plain stream on the Savannah River Site, SC, USA. ENVIRONMENT INTERNATIONAL 2019; 133:105174. [PMID: 31627135 DOI: 10.1016/j.envint.2019.105174] [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: 02/22/2019] [Revised: 09/07/2019] [Accepted: 09/08/2019] [Indexed: 06/10/2023]
Abstract
Accumulation of eleven trace elements in sediment was evaluated throughout an industrially disturbed headwater stream on the Savannah River Site, SC, USA. Sampling began at upstream sedimentation basins at the margins of industrial areas, continued longitudinally downstream to a beaver pond representing a potential sink in the mid-reaches, and ended in downstream reaches. Additionally, sediment from beaver impacted areas in another industrially disturbed stream and a reference stream were analyzed to assess the natural tendency of these depositional features to settle out trace elements. We further compared trace element accumulation in sediment and biota from downstream reaches before and after an extreme rainy period to evaluate the potential redistribution of trace elements from sink areas. Trace elements accumulated in the headwater basins from which elements were redistributed to downstream reaches. The mid-reach beaver affected area sediments accumulated elevated concentrations of most analyzed elements compared to the free-flowing stream. The elevated accumulation of organic matter in these sink areas illustrated the effectiveness of reduced water velocity areas to settle out materials. The natural tendency of beaver ponds to accumulate trace elements and organic matter was further illustrated by sediments from the reference beaver pond accumulating higher concentrations of several elements than sediments from the free flowing section the stream impacted by industrial activity. However, concentrations in sediment from sedimentation basins and the beaver impacted area of the disturbed stream were highest. Trace elements and organic matter appeared to be redistributed from the sinks after the record rainy period resulting in increased trace element concentrations in both sediment and biota. These data suggest that assessments of contaminants in stream systems should include such slow-water, extreme depositional zones such as beaver impacted areas or basins to verify what contaminants may be pulsing through the stream.
Collapse
Affiliation(s)
- Dean E Fletcher
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - Brooke E Lindell
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - Angela H Lindell
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - Paul T Stankus
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - Nathaniel D Fletcher
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - J Vaun McArthur
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| | - John C Seaman
- Savannah River Ecology Laboratory, University of Georgia, P. O. Drawer E, Aiken, SC 29802, USA.
| |
Collapse
|
33
|
Marks JC. Revisiting the Fates of Dead Leaves That Fall into Streams. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2019. [DOI: 10.1146/annurev-ecolsys-110218-024755] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
As terrestrial leaf litter decomposes in rivers, its constituent elements follow multiple pathways. Carbon leached as dissolved organic matter can be quickly taken up by microbes, then respired before it can be transferred to the macroscopic food web. Alternatively, this detrital carbon can be ingested and assimilated by aquatic invertebrates, so it is retained longer in the stream and transferred to higher trophic levels. Microbial growth on litter can affect invertebrates through three pathways, which are not mutually exclusive. First, microbes can facilitate invertebrate feeding, improving food quality by conditioning leaves and making them more palatable for invertebrates. Second, microbes can be prey for invertebrates. Third, microbes can compete with invertebrates for resources bound within litter and may produce compounds that retard carbon and nitrogen fluxes to invertebrates. As litter is broken down into smaller particles, there are many opportunities for its elements to reenter the stream food web. Here, I describe a conceptual framework for evaluating how traits of leaf litter will affect its fate in food webs and ecosystems that is useful for predicting how global change will alter carbon fluxes into and out of streams.
Collapse
Affiliation(s)
- Jane C. Marks
- Department of Biological Sciences and Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona 86011, USA
| |
Collapse
|
34
|
Surface Water Microbial Community Response to the Biocide 2,2-Dibromo-3-Nitrilopropionamide, Used in Unconventional Oil and Gas Extraction. Appl Environ Microbiol 2019; 85:AEM.01336-19. [PMID: 31444200 PMCID: PMC6803298 DOI: 10.1128/aem.01336-19] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/15/2019] [Indexed: 02/01/2023] Open
Abstract
Unconventional oil and gas activity can affect pH, total organic carbon, and microbial communities in surface water, altering their ability to respond to new environmental and/or anthropogenic perturbations. These findings demonstrate that 2,2-dibromo-3-nitrilopropionamide (DBNPA), a common hydraulic fracturing (HF) biocide, affects microbial communities differently as a consequence of past HF exposure, persisting longer in HF-impacted (HF+) waters. These findings also demonstrate that DBNPA has low efficacy in environmental microbial communities regardless of HF impact. These findings are of interest, as understanding microbial responses is key for formulating remediation strategies in unconventional oil and gas (UOG)-impacted environments. Moreover, some DBNPA degradation by-products are even more toxic and recalcitrant than DBNPA itself, and this work identifies novel brominated degradation by-products formed. Production of unconventional oil and gas continues to rise, but the effects of high-density hydraulic fracturing (HF) activity near aquatic ecosystems are not fully understood. A commonly used biocide in HF, 2,2-dibromo-3-nitrilopropionamide (DBNPA), was studied in microcosms of HF-impacted (HF+) versus HF-unimpacted (HF−) surface water streams to (i) compare the microbial community response, (ii) investigate DBNPA degradation products based on past HF exposure, and (iii) compare the microbial community response differences and similarities between the HF biocides DBNPA and glutaraldehyde. The microbial community responded to DBNPA differently in HF-impacted versus HF-unimpacted microcosms in terms of the number of 16S rRNA gene copies quantified, alpha and beta diversity, and differential abundance analyses of microbial community composition through time. The differences in microbial community changes affected degradation dynamics. HF-impacted microbial communities were more sensitive to DBNPA, causing the biocide and by-products of the degradation to persist for longer than in HF-unimpacted microcosms. A total of 17 DBNPA by-products were detected, many of them not widely known as DBNPA by-products. Many of the brominated by-products detected that are believed to be uncharacterized may pose environmental and health impacts. Similar taxa were able to tolerate glutaraldehyde and DBNPA; however, DBNPA was not as effective for microbial control, as indicated by a smaller overall decrease of 16S rRNA gene copies/ml after exposure to the biocide, and a more diverse set of taxa was able to tolerate it. These findings suggest that past HF activity in streams can affect the microbial community response to environmental perturbation such as that caused by the biocide DBNPA. IMPORTANCE Unconventional oil and gas activity can affect pH, total organic carbon, and microbial communities in surface water, altering their ability to respond to new environmental and/or anthropogenic perturbations. These findings demonstrate that 2,2-dibromo-3-nitrilopropionamide (DBNPA), a common hydraulic fracturing (HF) biocide, affects microbial communities differently as a consequence of past HF exposure, persisting longer in HF-impacted (HF+) waters. These findings also demonstrate that DBNPA has low efficacy in environmental microbial communities regardless of HF impact. These findings are of interest, as understanding microbial responses is key for formulating remediation strategies in unconventional oil and gas (UOG)-impacted environments. Moreover, some DBNPA degradation by-products are even more toxic and recalcitrant than DBNPA itself, and this work identifies novel brominated degradation by-products formed.
Collapse
|
35
|
Zhang W, Lei M, Li Y, Wang P, Wang C, Gao Y, Wu H, Xu C, Niu L, Wang L, Zhang H. Determination of vertical and horizontal assemblage drivers of bacterial community in a heavily polluted urban river. WATER RESEARCH 2019; 161:98-107. [PMID: 31181451 DOI: 10.1016/j.watres.2019.05.107] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/30/2019] [Accepted: 05/31/2019] [Indexed: 05/12/2023]
Abstract
Identifying vertical and horizontal assemblage drivers of bacterial community is important for improving the efficacies of ecological evaluation and remediation for a huge contaminated river (e.g. black-odor urban river). However, little is known about the effect of stochastic vs. deterministic processes on the reliability of the identification processes. Here, a comprehensive analysis was performed to reveal vertical and horizontal assemblage drivers of bacterial community in a heavily polluted urban river (total area of 4.23 km2 and total length of 9.3 km), considering the relative importance of stochastic and deterministic processes. Heterogeneous bacterial community assemblages were observed in both vertical and horizontal profiles and the differences in the bacterial community between depths were relatively significant at genus level. The higher values for the Simpson dissimilarity index (horizontal βSIM = 0.59 ± 0.02; vertical βSIM = 0.48 ± 0.03) compared to the nestedness-resultant dissimilarity index (horizontal βNES = 0.05 ± 0.02; vertical βNES = 0.05 ± 0.05) showed that species replacement explained both the vertical and horizontal beta-diversity patterns. Comparison of horizontal and vertical Sørensen dissimilarity indices further indicated that the biodiversity of vertical community deserved more attention due to the shorter geographical distance with similar beta-diversity patterns compared to horizontal assemblages. Various traditional analysis without consideration for phylogenetic turnover revealed that TN, TP, NH4+-N, DO, ORP, Conductivity and CODMn were all the related environmental factors that influenced bacterial community. However, after taking stochastic vs. deterministic processes into account, only NH4+-N and ORP were identified as the main driving forces of trends in the vertical and in the horizontal assembly of bacterial community in the polluted urban river, respectively. This study is helpful for improving ecological assessment methodology and remediation strategy for contaminated urban rivers.
Collapse
Affiliation(s)
- Wenlong Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Mengting Lei
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Yi Li
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China.
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Yu Gao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Hainan Wu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Chen Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Lihua Niu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Longfei Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Huanjun Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| |
Collapse
|
36
|
Ly T, Wright JR, Weit N, McLimans CJ, Ulrich N, Tokarev V, Valkanas MM, Trun N, Rummel S, Grant CJ, Lamendella R. Microbial Communities Associated With Passive Acidic Abandoned Coal Mine Remediation. Front Microbiol 2019; 10:1955. [PMID: 31507566 PMCID: PMC6716070 DOI: 10.3389/fmicb.2019.01955] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/08/2019] [Indexed: 02/01/2023] Open
Abstract
Acid mine drainage (AMD) is an environmental issue that can be characterized by either acidic or circumneutral pH and high dissolved metal content in contaminated waters. It is estimated to affect roughly 3000 miles of waterways within the state of Pennsylvania, with half being acidic and half being circumneutral. To negate the harmful effects of AMD, ∼300 passive remediation systems have been constructed within the state of Pennsylvania. In this study, we evaluated the microbial community structure and functional capability associated with Middle Branch passive remediation system in central PA. Sediment and water samples were collected from each area within the passive remediation system and its receiving stream. Environmental parameters associated with the remediation system were found to explain a significant amount of variation in microbial community structure. This study revealed shifts in microbial community structure from acidophilic bacteria in raw AMD discharge to a more metabolically diverse set of taxa (i.e., Acidimicrobiales, Rhizobiales, Chthoniobacteraceae) toward the end of the system. Vertical flow ponds and the aerobic wetland showed strong metabolic capability for sulfur redox environments. These findings are integral to the understanding of designing effective passive remediation systems because it provides insight as to how certain bacteria [sulfate reducing bacteria (SRBs) and sulfur oxidizing bacteria (SOBs)] are potentially contributing to a microbially mediated AMD remediation process. This study further supports previous investigations that demonstrated the effectiveness of SRBs in the process of removing sulfate and heavy metals from contaminated water.
Collapse
Affiliation(s)
- Truc Ly
- Department of Biology, Juniata College, Huntingdon, PA, United States
| | | | - Nicholas Weit
- Department of Biology, Juniata College, Huntingdon, PA, United States
| | | | - Nikea Ulrich
- Department of Biology, Juniata College, Huntingdon, PA, United States
| | | | - Michelle M Valkanas
- Department of Biological Sciences, Duquesne University, Pittsburgh, PA, United States
| | - Nancy Trun
- Department of Biological Sciences, Duquesne University, Pittsburgh, PA, United States
| | | | | | - Regina Lamendella
- Department of Biology, Juniata College, Huntingdon, PA, United States.,Wright Labs LLC., Huntingdon, PA, United States
| |
Collapse
|
37
|
Impact of Nutrient and Stoichiometry Gradients on Microbial Assemblages in Erhai Lake and Its Input Streams. WATER 2019. [DOI: 10.3390/w11081711] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Networks of lakes and streams are linked by downslope flows of material and energy within catchments. Understanding how bacterial assemblages are associated with nutrients and stoichiometric gradients in lakes and streams is essential for understanding biogeochemical cycling in freshwater ecosystems. In this study, we conducted field sampling of bacterial communities from lake water and stream biofilms in Erhai Lake watershed. We determined bacterial communities using high-throughput 16S rRNA gene sequencing and explored the relationship between bacterial composition and environmental factors using networking analysis, canonical correspondence analysis (CCA), and variation partitioning analysis (VPA). Physicochemical parameters, nutrients, and nutrient ratios gradients between the lake and the streams were strongly associated with the differences in community composition and the dominant taxa. Cyanobacteria dominated in Erhai Lake, while Proteobacteria dominated in streams. The stream bacterial network was more stable with multiple stressors, including physicochemical-factors and nutrient-factors, while the lake bacterial network was more fragile and susceptible to human activities with dominant nutrients (phosphorus). Negative correlations between bacterial communities and soluble reactive phosphorus (SRP) as well as positive correlations between bacterial communities and dissolved organic carbon (DOC) in the network indicated these factors had strong effect on bacterial succession. Erhai Lake is in a eutrophic state, and high relative abundances of Synechococcus (40.62%) and Microcystis (16.2%) were noted during the course of our study. CCA indicated that nutrients (phosphorus) were key parameters driving Cyanobacteria-dominated community structure. By classifying the environmental factors into five categories, VPA analyses identified that P-factor (total phosphorus (TP) and SRP) as well as the synergistic effect of C-factor (DOC), N-factor (NO3−), and P-factor (TP and SRP) played a central role in structuring the bacterial communities in Erhai Lake. Heterogeneous physicochemical conditions explained the variations in bacterial assemblages in streams. This study provides a picture of stream–lake linkages from the perspective of bacterial community structure as well as key factors driving bacterial assemblages within lakes and streams at the whole watershed scale. We further argue that better management of phosphorus on the watershed scale is needed for ameliorating eutrophication of Erhai Lake.
Collapse
|
38
|
Jourdan J, Baranov V, Wagner R, Plath M, Haase P. Elevated temperatures translate into reduced dispersal abilities in a natural population of an aquatic insect. J Anim Ecol 2019; 88:1498-1509. [DOI: 10.1111/1365-2656.13054] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 05/16/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Jonas Jourdan
- Department of River Ecology and Conservation Senckenberg Research Institute and Natural History Museum Frankfurt Gelnhausen Germany
- Department Aquatic Ecotoxicology Johann Wolfgang Goethe University Frankfurt am Main Frankfurt am Main Germany
| | - Viktor Baranov
- Department of River Ecology and Conservation Senckenberg Research Institute and Natural History Museum Frankfurt Gelnhausen Germany
| | - Rüdiger Wagner
- FB 10 Nat. Sci., Biology, Zoology University of Kassel Kassel Germany
| | - Martin Plath
- College of Animal Science and Technology Northwest A&F University Yangling China
| | - Peter Haase
- Department of River Ecology and Conservation Senckenberg Research Institute and Natural History Museum Frankfurt Gelnhausen Germany
- Faculty of Biology University of Duisburg‐Essen Essen Germany
| |
Collapse
|
39
|
Hotaling S, Quackenbush CR, Bennett-Ponsford J, New DD, Arias-Rodriguez L, Tobler M, Kelley JL. Bacterial Diversity in Replicated Hydrogen Sulfide-Rich Streams. MICROBIAL ECOLOGY 2019; 77:559-573. [PMID: 30105506 DOI: 10.1007/s00248-018-1237-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Accepted: 07/23/2018] [Indexed: 06/08/2023]
Abstract
Extreme environments typically require costly adaptations for survival, an attribute that often translates to an elevated influence of habitat conditions on biotic communities. Microbes, primarily bacteria, are successful colonizers of extreme environments worldwide, yet in many instances, the interplay between harsh conditions, dispersal, and microbial biogeography remains unclear. This lack of clarity is particularly true for habitats where extreme temperature is not the overarching stressor, highlighting a need for studies that focus on the role other primary stressors (e.g., toxicants) play in shaping biogeographic patterns. In this study, we leveraged a naturally paired stream system in southern Mexico to explore how elevated hydrogen sulfide (H2S) influences microbial diversity. We sequenced a portion of the 16S rRNA gene using bacterial primers for water sampled from three geographically proximate pairings of streams with high (> 20 μM) or low (~ 0 μM) H2S concentrations. After exploring bacterial diversity within and among sites, we compared our results to a previous study of macroinvertebrates and fish for the same sites. By spanning multiple organismal groups, we were able to illuminate how H2S may differentially affect biodiversity. The presence of elevated H2S had no effect on overall bacterial diversity (p = 0.21), a large effect on community composition (25.8% of variation explained, p < 0.0001), and variable influence depending upon the group-whether fish, macroinvertebrates, or bacteria-being considered. For bacterial diversity, we recovered nine abundant operational taxonomic units (OTUs) that comprised a core H2S-rich stream microbiome in the region. Many H2S-associated OTUs were members of the Epsilonproteobacteria and Gammaproteobacteria, which both have been implicated in endosymbiotic relationships between sulfur-oxidizing bacteria and eukaryotes, suggesting the potential for symbioses that remain to be discovered in these habitats.
Collapse
Affiliation(s)
- Scott Hotaling
- School of Biological Sciences, Washington State University, Pullman, WA, 99164, USA
| | - Corey R Quackenbush
- School of Biological Sciences, Washington State University, Pullman, WA, 99164, USA
| | | | - Daniel D New
- Institute for Bioinformatics and Evolutionary Studies (IBEST), University of Idaho, Moscow, ID, USA
| | - Lenin Arias-Rodriguez
- División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, Mexico
| | - Michael Tobler
- Division of Biology, Kansas State University, Manhattan, KS, USA
| | - Joanna L Kelley
- School of Biological Sciences, Washington State University, Pullman, WA, 99164, USA.
| |
Collapse
|
40
|
Liu S, Wang C, Wang P, Chen J, Wang X, Yuan Q. Variation of bacterioplankton community along an urban river impacted by touristic city: With a focus on pathogen. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 165:573-581. [PMID: 30236919 DOI: 10.1016/j.ecoenv.2018.09.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/29/2018] [Accepted: 09/01/2018] [Indexed: 06/08/2023]
Abstract
Bacterioplankton communities play a critical role in ecological processes in river systems, and shifts of their composition may impact microbial levels and raise public health concerns. The aim of this study was to comprehensively analyze the essential factors influencing bacterioplankton community, along with pathogen, and to estimate the health risk caused by the pathogens downstream of the Liushahe River, which is located in the famous touristic city Xishuangbanna. Results showed that wastewater treatment plants (WWTPs) and a subtropical recreational park impacted the bacterioplankton community and pathogen population, and potential pathogen identification demonstrated that 76 of 145 reference genera were present in the river. Moreover, the bacterioplankton community and pathogen were differently impacted by environmental gradients, and SRP, NO2 and pH were main factors influencing bacterioplankton community while pathogen population was highly correlated with temperature and turbidity. In addition, it is noted that the pathogen population was dominated by bacterioplankton community and this might because the capacity of resistance invasion pathogen was determined by of bacterioplankton community diversity. Therefore, bacterioplankton community diversity can be used to control and predict the amount of pathogens. Quantitative microbial risk assessment (QMRA) also revealed that the infection risks of Escherichia coli (E. coli), Mycobacterium avium (M. avium), and Pseudomonas aeruginosa (P. aeruginosa) during five recreational activities, especially water-based activities in the touristic city, were greater than that in natural areas and mostly exceeded the U.S. EPA risk limit for recreational activities. Our study offered the first insight into the potential relationship between the bacterioplankton community and bacterial pathogens within a touristic river.
Collapse
Affiliation(s)
- Sheng Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
| | - Juan Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Xun Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Qiusheng Yuan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| |
Collapse
|
41
|
Hassell N, Tinker KA, Moore T, Ottesen EA. Temporal and spatial dynamics in microbial community composition within a temperate stream network. Environ Microbiol 2018; 20:3560-3572. [PMID: 30051569 DOI: 10.1111/1462-2920.14311] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 06/11/2018] [Accepted: 06/11/2018] [Indexed: 12/14/2022]
Abstract
The water column of streams hosts a unique microbial community that is distinct from the microbial communities of the stream benthos and surrounding soil. This community is shaped by complex interacting forces, including microbial dispersal from surrounding environments and in-stream selection. However, how the processes structuring stream communities change over space and time remains poorly understood. In this study, we characterize spatial and temporal trends in microbial community composition throughout a stream network spanning first through fifth order streams. We found that the microbial communities of headwater streams are compositionally diverse, with low representation of freshwater microbial taxa and high representation of soil and sediment-associated taxa. In three out of five seasonal samplings, a successional pattern was identified in which phylotype richness and compositional heterogeneity decreased while the proportion of known freshwater taxa increased with increasing cumulative upstream dendritic distance. However, in two samplings, streams instead exhibited uniformly high microbial diversity across the watershed, and the fraction of freshwater taxa showed no relationship with dendritic distance. Overall, our data suggest that the successional processes that drive microbial diversity in streams are highly dynamic and can be disrupted at landscape scales, potentially in response to variation in temperature and precipitation.
Collapse
Affiliation(s)
- Norman Hassell
- Department of Microbiology, University of Georgia, Athens, GA, USA.,Institute of Bioinformatics, University of Georgia, Athens, GA, USA
| | - Kara A Tinker
- Department of Microbiology, University of Georgia, Athens, GA, USA
| | | | | |
Collapse
|
42
|
Priming of leaf litter decomposition by algae seems of minor importance in natural streams during autumn. PLoS One 2018; 13:e0200180. [PMID: 30192753 PMCID: PMC6128472 DOI: 10.1371/journal.pone.0200180] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 08/15/2018] [Indexed: 11/19/2022] Open
Abstract
Allochthonous detritus of terrestrial origin is one of the main energy sources in forested headwater streams, but its poor nutritional quality makes it difficult to use by heterotrophs. It has been suggested that algae growing on this detritus can enhance its nutritional quality and promote decomposition. So far, most evidence of this "priming effect” is derived from laboratory or mesocosm experiments, and its importance under natural conditions is unclear. We measured accrual of algae, phosphorus uptake capacity, and decomposition of poplar leaves in autumn in open- and closed-canopy reaches in 3 forest and 3 agricultural streams. Chlorophyll a abundance did not change significantly with stream type or with canopy cover, although in some agricultural streams it was higher in open than in closed canopy reaches. Canopy cover did not affect either phosphate uptake capacity or microbial decomposition. On the other hand, although there was no effect of canopy cover on invertebrate fragmentation rate, a significant interaction between canopy cover and stream suggests priming occurs at least in some streams. Overall, the results point to a weak or no priming effect of algae on litter decomposition in natural streams during autumn.
Collapse
|
43
|
Compson ZG, Hungate BA, Whitham TG, Koch GW, Dijkstra P, Siders AC, Wojtowicz T, Jacobs R, Rakestraw DN, Allred KE, Sayer CK, Marks JC. Linking tree genetics and stream consumers: isotopic tracers elucidate controls on carbon and nitrogen assimilation. Ecology 2018; 99:1759-1770. [DOI: 10.1002/ecy.2224] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 01/30/2018] [Accepted: 02/09/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Zacchaeus G. Compson
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Bruce A. Hungate
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Thomas G. Whitham
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - George W. Koch
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Paul Dijkstra
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Adam C. Siders
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Todd Wojtowicz
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Ryan Jacobs
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - David N. Rakestraw
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Kiel E. Allred
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Chelsea K. Sayer
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| | - Jane C. Marks
- Center for Ecosystem Science and Society; 800 S. Beaver Street, P.O. Box 5620 Flagstaff Arizona 86011-5620 USA
- Merriam-Powell Center for Environmental Research; 800 S. Beaver Street, P.O. Box 6077 Flagstaff Arizona 86011-6077 USA
- Department of Biological Sciences; Northern Arizona University; 617 S. Beaver Street, P.O. Box 5640 Flagstaff Arizona 86011-5640 USA
| |
Collapse
|
44
|
Hu Y, Cai J, Bai C, Shao K, Tang X, Gao G. Contrasting patterns of the bacterial and archaeal communities in a high-elevation river in northwestern China. J Microbiol 2018; 56:104-112. [PMID: 29392556 DOI: 10.1007/s12275-018-7244-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 12/25/2017] [Accepted: 01/04/2018] [Indexed: 11/28/2022]
Abstract
The patterns of macrobiota in lotic ecosystems have been extensively explored, however, the dynamics of microbiota remain poorly investigated, especially in the high-elevation region. To address this deficit, we collected eight samples to unveil the bacterial and archaeal community in the Kaidu river, located at the arid region of northwestern China (an average of 2,500 m a.s.l.). For the bacterial community, phylogenetically Betaproteobacteria prevailed, followed by Alphaproteobacteria and Actinobacteria; at the finer genus level, Limnohabitans and Variovorax were prominent. Along the river, the bacterial community showed a continuous succession. Specifically, their α- and β-diversity gradually increased, suggesting a distance-decay pattern. Additionally, there was an ecological transition between the dominant and the rare sub-community along the river: the relative abundance of the dominant members gradually decreased as the rare members increased. We report that temperature and spatial distance were significantly related to the variation of bacterial community. Variance partitioning analysis showed that the environmental factors contributed more to the bacterial community than did the spatial distance. In the case of the archaeal community, the methanogenic groups, mainly Methanosaeta and Methanosarcina, were prominent within the Kaidu river. Unlike the continuous change in the patterns of the bacterial community, the archaeal community showed a constant pattern along the river. Our results showed that the archaeal community was independent of the environmental and spatial factors. We propose that the inoculation of soil-derived archaea is responsible for the archaeal community in the Kaidu river. Together, our study demonstrated that the bacterial community in the high-elevation Kaidu river is a continuum, whereas the archaeal community is not.
Collapse
Affiliation(s)
- Yang Hu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100000, P. R. China
| | - Jian Cai
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100000, P. R. China
| | - Chengrong Bai
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100000, P. R. China
| | - Keqiang Shao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China
| | - Xiangming Tang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China
| | - Guang Gao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, P. R. China.
| |
Collapse
|
45
|
Liu T, Zhang AN, Wang J, Liu S, Jiang X, Dang C, Ma T, Liu S, Chen Q, Xie S, Zhang T, Ni J. Integrated biogeography of planktonic and sedimentary bacterial communities in the Yangtze River. MICROBIOME 2018; 6:16. [PMID: 29351813 PMCID: PMC5775685 DOI: 10.1186/s40168-017-0388-x] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 12/17/2017] [Indexed: 05/03/2023]
Abstract
BACKGROUND Bacterial communities are essential to the biogeochemical cycle in riverine ecosystems. However, little is presently known about the integrated biogeography of planktonic and sedimentary bacterial communities in large rivers. RESULTS This study provides the first spatiotemporal pattern of bacterial communities in the Yangtze River, the largest river in Asia with a catchment area of 1,800,000 km2. We find that sedimentary bacteria made larger contributions than planktonic bacteria to the bacterial diversity of the Yangzte River ecosystem with the sediment subgroup providing 98.8% of 38,906 operational taxonomic units (OTUs) observed in 280 samples of synchronous flowing water and sediment at 50 national monitoring stations covering a 4300 km reach. OTUs within the same phylum displayed uniform seasonal variations, and many phyla demonstrated autumn preference throughout the length of the river. Seasonal differences in bacterial communities were statistically significant in water, whereas bacterial communities in both water and sediment were geographically clustered according to five types of landforms: mountain, foothill, basin, foothill-mountain, and plain. Interestingly, the presence of two huge dams resulted in a drastic fall of bacterial taxa in sediment immediately downstream due to severe riverbed scouring. The integrity of the biogeography is satisfactorily interpreted by the combination of neutral and species sorting perspectives in meta-community theory for bacterial communities in flowing water and sediment. CONCLUSIONS Our study fills a gap in understanding of bacterial communities in one of the world's largest river and highlights the importance of both planktonic and sedimentary communities to the integrity of bacterial biogeographic patterns in a river subject to varying natural and anthropogenic impacts.
Collapse
Affiliation(s)
- Tang Liu
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - An Ni Zhang
- Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Jiawen Wang
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Shufeng Liu
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Xiaotao Jiang
- Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Chenyuan Dang
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Tao Ma
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Sitong Liu
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Qian Chen
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, 810016, China
| | - Shuguang Xie
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China
| | - Tong Zhang
- Environmental Biotechnology Laboratory, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
| | - Jinren Ni
- College of Environmental Sciences and Engineering, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing, 100871, China.
- School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, China.
| |
Collapse
|
46
|
Ren Z, Wang F, Qu X, Elser JJ, Liu Y, Chu L. Taxonomic and Functional Differences between Microbial Communities in Qinghai Lake and Its Input Streams. Front Microbiol 2017; 8:2319. [PMID: 29213266 PMCID: PMC5702853 DOI: 10.3389/fmicb.2017.02319] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 11/10/2017] [Indexed: 12/22/2022] Open
Abstract
Understanding microbial communities in terms of taxon and function is essential to decipher the biogeochemical cycling in aquatic ecosystems. Lakes and their input streams are highly linked. However, the differences between microbial assemblages in streams and lakes are still unclear. In this study, we conducted an intensive field sampling of microbial communities from lake water and stream biofilms in the Qinghai Lake watershed, the largest lake in China. We determined bacterial communities using high-throughput 16S rRNA gene sequencing and predicted functional profiles using PICRUSt to determine the taxonomic and functional differences between microbial communities in stream biofilms and lake water. The results showed that stream biofilms and lake water harbored distinct microbial communities. The microbial communities were different taxonomically and functionally between stream and lake. Moreover, streams biofilms had a microbial network with higher connectivity and modularity than lake water. Functional beta diversity was strongly correlated with taxonomic beta diversity in both the stream and lake microbial communities. Lake microbial assemblages displayed greater predicted metabolic potentials of many metabolism pathways while the microbial assemblages in stream biofilms were more abundant in xenobiotic biodegradation and metabolism and lipid metabolism. Furthermore, lake microbial assemblages had stronger predicted metabolic potentials in amino acid metabolism, carbon fixation, and photosynthesis while stream microbial assemblages were higher in carbohydrate metabolism, oxidative phosphorylation, and nitrogen metabolism. This study adds to our knowledge of stream-lake linkages from the functional and taxonomic composition of microbial assemblages.
Collapse
Affiliation(s)
- Ze Ren
- Flathead Lake Biological Station, University of Montana, Polson, MT, United States
| | - Fang Wang
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Xiaodong Qu
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - James J. Elser
- Flathead Lake Biological Station, University of Montana, Polson, MT, United States
| | - Yang Liu
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing, China
| | - Limin Chu
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
- Department of Water Resources, China Institute of Water Resources and Hydropower Research, Beijing, China
| |
Collapse
|
47
|
Wang P, Wang X, Wang C, Miao L, Hou J, Yuan Q. Shift in bacterioplankton diversity and structure: Influence of anthropogenic disturbances along the Yarlung Tsangpo River on the Tibetan Plateau, China. Sci Rep 2017; 7:12529. [PMID: 28970506 PMCID: PMC5624883 DOI: 10.1038/s41598-017-12893-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 09/08/2017] [Indexed: 12/22/2022] Open
Abstract
River systems have critical roles in the natural water environment and the transportation of nutrients. Anthropogenic activities, including wastewater discharge and river damming, raise adverse impacts on ecosystem and continuum of rivers. An increasing amount of attention has been paid to riverine bacterioplankton as they make vital contributions to biogeochemical nutrient cycle. A comprehensive study was conducted on the bacterioplankton community along the Yarlung Tsangpo River, which is the longest plateau river in China and is suffering from various anthropogenic impacts. The results indicated that nutrient variations corresponded to anthropogenic activities, and silica, nitrogen and phosphorus were retained by the dam. River damming influenced the biomass and diversity of the bacterioplankton, but significant alterations in the community structure were not observed between upstream and downstream of the dam. Moreover, the spatial distribution of the bacterioplankton community changed gradually along the river, and the dominant bacterioplankton in the upstream, midstream and downstream portions of the river were Firmicutes, Bacteroidetes and Proteobacteria, respectively. Soluble reactive phosphorus, elevation, ammonium nitrogen, velocity and turbidity were the main environmental factors that shape the bacterioplankton community. Our study offers the first insights into the variation of a bacterioplankton community of a large river in plateau region.
Collapse
Affiliation(s)
- Peifang Wang
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
| | - Xun Wang
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
| | - Chao Wang
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Lingzhan Miao
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Jun Hou
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Qiusheng Yuan
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| |
Collapse
|
48
|
Freixa A, Acuña V, Casellas M, Pecheva S, Romaní AM. Warmer night-time temperature promotes microbial heterotrophic activity and modifies stream sediment community. GLOBAL CHANGE BIOLOGY 2017; 23:3825-3837. [PMID: 28208235 DOI: 10.1111/gcb.13664] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 02/03/2017] [Indexed: 06/06/2023]
Abstract
Diel temperature patterns are changing because of global warming, with higher temperatures being predicted to be more pronounced at night. Biological reactions are temperature dependent, with some occurring only during the daylight hours (e.g., light photosynthesis) and other during the entire day (e.g., respiration). Consequently, we expect the modification of daily temperature cycles to alter microbial biological reactions in stream sediments. Here, we aimed to study the effect of warming and changes of the diel temperature patterns on stream sediment biofilm functions tied to organic carbon decomposition, as well as on biofilm meiofaunal community structure. We performed an eight-week experiment with 12 artificial streams subjected to three different diel temperature patterns: warming, warmer nights and control. Significant effects of warming on biofilm function and structure were mainly detected in the long term. Our results showed that warming altered biofilm function, especially in the warmer nights' treatment, which enhanced β-glucosidase enzyme activity. Interestingly, clear opposite diel patterns were observed for dissolved organic carbon and β-glucosidase activity, suggesting that, at night, sediment bacteria quickly consume the input of photosynthetic dissolved organic carbon labile compounds created during light-time. The biofilm structure was also altered by warming, as both warming and warmer night treatments enhanced copepod abundance and diminished abundances of turbellaria and nematodes, which, in turn, controlled bacterial, algal and ciliate communities. Overall, we conclude that warming has strong effect on sediment biofilm structure and enhanced microbial organic matter degradation which might, consequently, affect higher trophic levels and river carbon cycling.
Collapse
Affiliation(s)
- Anna Freixa
- Institute of Aquatic Ecology, University of Girona, Girona, Spain
- Catalan Institute for Water Research (ICRA), Girona, Spain
| | - Vicenç Acuña
- Catalan Institute for Water Research (ICRA), Girona, Spain
| | - Maria Casellas
- Catalan Institute for Water Research (ICRA), Girona, Spain
| | | | - Anna M Romaní
- Institute of Aquatic Ecology, University of Girona, Girona, Spain
| |
Collapse
|
49
|
Colonization Habitat Controls Biomass, Composition, and Metabolic Activity of Attached Microbial Communities in the Columbia River Hyporheic Corridor. Appl Environ Microbiol 2017; 83:AEM.00260-17. [PMID: 28600318 DOI: 10.1128/aem.00260-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 06/02/2017] [Indexed: 01/25/2023] Open
Abstract
Hydrologic exchange plays a critical role in biogeochemical cycling within the hyporheic zone (the interface between river water and groundwater) of riverine ecosystems. Such exchange may set limits on the rates of microbial metabolism and impose deterministic selection on microbial communities that adapt to dynamically changing dissolved organic carbon (DOC) sources. This study examined the response of attached microbial communities (in situ colonized sand packs) from groundwater, hyporheic, and riverbed habitats within the Columbia River hyporheic corridor to "cross-feeding" with either groundwater, river water, or DOC-free artificial fluids. Our working hypothesis was that deterministic selection during in situ colonization would dictate the response to cross-feeding, with communities displaying maximal biomass and respiration when supplied with their native fluid source. In contrast to expectations, the major observation was that the riverbed colonized sand had much higher biomass and respiratory activity, as well as a distinct community structure, compared with those of the hyporheic and groundwater colonized sands. 16S rRNA gene amplicon sequencing revealed a much higher proportion of certain heterotrophic taxa as well as significant numbers of eukaryotic algal chloroplasts in the riverbed colonized sand. Significant quantities of DOC were released from riverbed sediment and colonized sand, and separate experiments showed that the released DOC stimulated respiration in the groundwater and piezometer colonized sand. These results suggest that the accumulation and degradation of labile particulate organic carbon (POC) within the riverbed are likely to release DOC, which may enter the hyporheic corridor during hydrologic exchange, thereby stimulating microbial activity and imposing deterministic selective pressure on the microbial community composition.IMPORTANCE The influence of river water-groundwater mixing on hyporheic zone microbial community structure and function is an important but poorly understood component of riverine biogeochemistry. This study employed an experimental approach to gain insight into how such mixing might be expected to influence the biomass, respiration, and composition of hyporheic zone microbial communities. Colonized sands from three different habitats (groundwater, river water, and hyporheic) were "cross-fed" with either groundwater, river water, or DOC-free artificial fluids. We expected that the colonization history would dictate the response to cross-feeding, with communities displaying maximal biomass and respiration when supplied with their native fluid source. By contrast, the major observation was that the riverbed communities had much higher biomass and respiration, as well as a distinct community structure compared with those of the hyporheic and groundwater colonized sands. These results highlight the importance of riverbed microbial metabolism in organic carbon processing in hyporheic corridors.
Collapse
|
50
|
Robbins CJ, King RS, Yeager AD, Walker CM, Back JA, Doyle RD, Whigham DF. Low‐level addition of dissolved organic carbon increases basal ecosystem function in a boreal headwater stream. Ecosphere 2017. [DOI: 10.1002/ecs2.1739] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Caleb J. Robbins
- Center for Reservoir and Aquatic Systems Research Department of Biology Baylor University One Bear Place 97388 Waco Texas 76798 USA
| | - Ryan S. King
- Center for Reservoir and Aquatic Systems Research Department of Biology Baylor University One Bear Place 97388 Waco Texas 76798 USA
| | - Alyse D. Yeager
- Center for Reservoir and Aquatic Systems Research Department of Biology Baylor University One Bear Place 97388 Waco Texas 76798 USA
| | - Coowe M. Walker
- Kachemak Bay Research Reserve 2181 Kachemak Drive Homer Alaska 99603 USA
| | - Jeffrey A. Back
- Center for Reservoir and Aquatic Systems Research Department of Biology Baylor University One Bear Place 97388 Waco Texas 76798 USA
| | - Robert D. Doyle
- Center for Reservoir and Aquatic Systems Research Department of Biology Baylor University One Bear Place 97388 Waco Texas 76798 USA
| | - Dennis F. Whigham
- Smithsonian Environmental Research Center P.O. Box 28, 647 Contees Wharf Road Edgewater Maryland 21037 USA
| |
Collapse
|