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Pelagic-benthic coupling of the microbial food web modifies nutrient cycles along a cascade-dammed river

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Abstract

Cascade dams disrupt the river continuum, altering hydrology, biodiversity and nutrient flux. Describing the diversity of multi-trophic microbiota and assessing microbial contributions to the ecosystem processes are prerequisites for the restoration of these aquatic systems. This study investigated the microbial food web structure along a cascade-dammed river, paying special attention to the multi-trophic relationships and the potential role of pelagic-benthic coupling in nutrient cycles. Our results revealed the discontinuity in bacterial and eukaryotic community composition, functional group proportion, as well as α-diversity due to fragmentation by damming. The high microbial dissimilarity along the river, with the total multi-trophic β-diversity was 0.84, was almost completely caused by species replacement. Synchronization among trophic levels suggests potential interactions of the pelagic and the benthic groups, of which the β-diversities were primarily influenced by geographic and environmental factors, respectively. Dam-induced environmental variations, especially hydrological and nutrient variables, potentially influence the microbial food web via both top-down and bottom-up forces. We proposed that the cycles of carbon, nitrogen and phosphorus are influenced by multi-trophic groups through autotrophic and heterotrophic processes, predator-prey relationships, as well as the release of nutrients mainly by microfauna. Our results advance the notion that pelagic-benthic trophic coupling may intensify the accumulation of organic carbon, ammonium and inorganic phosphorus, thereby changing the biogeochemical patterns along river systems. As a consequence, researchers should pay more attention to the multi-trophic studies when assessing the environmental impacts, and to provide the necessary guidance for the ecological conservation and restoration of the dam-regulated systems.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51779076 and 51879079).

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Authors and Affiliations

  1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China

    Nan Yang, Yi Li, Wenlong Zhang, Lihua Niu, Huanjun Zhang & Longfei Wang

  2. College of Oceanography, Hohai University, Nanjing, 210098, China

    Linqiong Wang

  3. Department of Basin Water Environment, Changjiang River Scientific Research Institute, Wuhan, 430010, China

    Li Lin

  4. Hubei Provincial Key Laboratory of Basin Water Resources and Ecological Environment Sciences, Changjiang River Scientific Research Institute, Wuhan, 430010, China

    Li Lin

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  1. Nan Yang
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  2. Linqiong Wang
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  3. Li Lin
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  4. Yi Li
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  5. Wenlong Zhang
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  6. Lihua Niu
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  8. Longfei Wang
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Correspondence to Yi Li.

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Highlights

• Structure of multi-trophic microbial groups were analyzed using DNA metabarcoding.

• Discontinuity and trophic interactions were observed along the dam-fragmented river.

• C, N and P cycles are driven by top-down and bottom-up forces of microbial food web.

• Pelagic-benthic coupling may intensify nutrient accumulation in the river system.

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Yang, N., Wang, L., Lin, L. et al. Pelagic-benthic coupling of the microbial food web modifies nutrient cycles along a cascade-dammed river. Front. Environ. Sci. Eng. 16, 50 (2022). https://doi.org/10.1007/s11783-021-1484-5

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