Resilience of Pelagic and Benthic Microbial Communities to Sediment Resuspension in a Coastal Ecosystem, Knebel Vig, Denmark

1996 ◽  
Vol 42 (4) ◽  
pp. 405-415 ◽  
Author(s):  
Niels Peter Sloth ◽  
Bo Riemann ◽  
Lars Peter Nielsen ◽  
T. Blackburn
Keyword(s):  
Microbial Communities ◽  
Sediment Resuspension ◽  
Coastal Ecosystem ◽  
Benthic Microbial Communities

scholarly journals Metagenomics Reveals the Influence of Land Use and Rain on the Benthic Microbial Communities in a Tropical Urban Waterway

mSystems ◽  
2018 ◽  
Vol 3 (3) ◽  
Author(s):  
Gourvendu Saxena ◽  
Suparna Mitra ◽  
Ezequiel M. Marzinelli ◽  
Chao Xie ◽  
Toh Jun Wei ◽  
...  
Keyword(s):  
Land Use ◽  
Microbial Communities ◽  
Carbon Fixation ◽  
Nucleic Acid Metabolism ◽  
Rain Event ◽  
Residential Areas ◽  
Environmental Pressures ◽  
Urban Waterways ◽  
Secondary Productivity ◽  
Benthic Microbial Communities

ABSTRACT Growing demands for potable water have led to extensive reliance on waterways in tropical megacities. Attempts to manage these waterways in an environmentally sustainable way generally lack an understanding of microbial processes and how they are influenced by urban factors, such as land use and rain. Here, we describe the composition and functional potential of benthic microbial communities from an urban waterway network and analyze the effects of land use and rain perturbations on these communities. With a sequence depth of 3 billion reads from 48 samples, these metagenomes represent nearly full coverage of microbial communities. The predominant taxa in these waterways were Nitrospira and Coleofasciculus , indicating the presence of nitrogen and carbon fixation in this system. Gene functions from carbohydrate, protein, and nucleic acid metabolism suggest the presence of primary and secondary productivity in such nutrient-deficient systems. Comparison of microbial communities by land use type and rain showed that while there are significant differences in microbial communities in land use, differences due to rain perturbations were rain event specific. The more diverse microbial communities in the residential areas featured a higher abundance of reads assigned to genes related to community competition. However, the less diverse communities from industrial areas showed a higher abundance of reads assigned to specialized functions such as organic remediation. Finally, our study demonstrates that microbially diverse populations in well-managed waterways, where contaminant levels are within defined limits, are comparable to those in other relatively undisturbed freshwater systems. IMPORTANCE Unravelling the microbial metagenomes of urban waterway sediments suggest that well-managed urban waterways have the potential to support diverse sedimentary microbial communities, similar to those of undisturbed natural freshwaters. Despite the fact that these urban waterways are well managed, our study shows that environmental pressures from land use and rain perturbations play a role in shaping the structure and functions of microbial communities in these waterways. We propose that although pulsed disturbances, such as rain perturbations, influence microbial communities, press disturbances, including land usage history, have a long-term and stronger influence on microbial communities. Our study found that the functions of microbial communities were less affected by environmental factors than the structure of microbial communities was, indicating that core microbial functions largely remain conserved in challenging environments.

Benthic microbial utilization of differential dissolved organic matter sources in a forest headwater stream

2003 ◽  
Vol 33 (8) ◽  
pp. 1444-1451 ◽  
Author(s):  
David P Kreutzweiser ◽  
Scott S Capell
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microbial Communities ◽  
Community Respiration ◽  
Metabolic Profiles ◽  
Respiration Activity ◽  
Microbial Utilization ◽  
Mesocosm Experiments ◽  
Significant Change ◽  
Benthic Microbial Communities

Streamside mesocosm experiments were conducted in a low-order forest watershed to directly examine responses by microbial communities on standardized substrates to different terrestrial and aquatic sources of dissolved organic matter (DOM). Community respiration (oxygen uptake), microbial density (colony-forming units on agar plates), leaf decomposition, and community metabolic profiles (metabolism patterns in sole carbon source utilization assays) were measured. Stream benthic microbial communities responded immediately and positively to increases in terrestrially derived DOM. Respiration activity and density estimates increased significantly, but there was no significant change in community metabolic profile. Responses were greater to DOM extracted from upper soil horizons than from deeper soils. Community respiration and bacterial abundance also increased in response to an aquatic DOM source, but were accompanied by a significant change in community metabolic profiles. Results provide direct experimental evidence that benthic microbial communities of forest headwater streams are able to rapidly utilize terrestrial DOM.

scholarly journals Metabolic profiling suggests two sources of organic matter shape microbial activity, but not community composition, in New Zealand fjords

2019 ◽  
Author(s):  
Sven P. Tobias-Hünefeldt ◽  
Stephen R. Wing ◽  
Federico Baltar ◽  
Sergio E. Morales
Keyword(s):  
Organic Matter ◽  
Microbial Communities ◽  
Microbial Activity ◽  
Community Composition ◽  
Sediment Resuspension ◽  
Metabolic Diversity ◽  
New Production ◽  
Metabolic Potential ◽  
Microbial Carbon ◽  
And Function

AbstractFjords are semi-enclosed marine systems with unique physical conditions that influence microbial communities structure. Pronounced organic matter and physical condition gradients within fjords provide a natural laboratory for the study of changes in microbial phylogeny and metabolic potential in response to environmental conditions (e.g. depth). In the open ocean new production from photosynthesis supplies organic matter to deeper aphotic layers, sustaining microbial activity. We measured the metabolic diversity and activity of microbial communities in fjords to determine patterns in metabolic potential across and within fjords, and whether these patterns could be explained by community composition modifications. We demonstrated that metabolic potential and activity are shaped by similar parameters as total (prokaryotic and eukaryotic) microbial communities. However, we identified increases in metabolic diversity and potential (but not in community composition) at near bottom (aphotic) sites consistent with the influence of sediments in deeper waters. Thus, while composition and function of the microbial community in the upper water column was likely shaped by marine snow and sinking POM generated by new production, deeper sites were strongly influenced by sediment resuspension of benthic organic matter generated from this or other sources (terrestrial, chemoautotrophic, microbial carbon loop), uncoupling the community composition and function dynamics.

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