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Spatial and vertical distribution of aerobic and anaerobic dark inorganic carbon fixation in coastal tropical lake sediments

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Abstract

The process of chemosynthesis can represent an important source of organic matter and energy across the benthic zone. However, its detailed vertical distribution and importance in relation to other microbial processes are still poorly investigated in inland aquatic ecosystems. Here, we determined the rates of dark inorganic carbon fixation (DCF) compared to heterotrophic bacterial production (BP) and oxygen consumption (SOC) across a depth profile of oxic to anoxic sediments in the littoral zone of nine tropical lakes located in one of the most important coastal conservation areas, the Jurubatiba Sandbank National Park (Rio de Janeiro, Brazil). Rates of DCF were highly variable (means of 0.1–1.2 mmol C m−2 d−1) among the studied lakes, with mostly production occurring below 10 mm of sediment in the anoxic zone. Although presenting a relatively low contribution in relation to BP and SOC, our study showed extensive microbial metabolism in the anaerobic sediment below the top centimeter, highlighting the importance of studying microbial processes across depth at fine scales. To our knowledge, it is the first study to show detailed vertical DCF rates in coastal tropical lake sediments, thus contributing to a better comprehension of the microbial role in the biogeochemical cycles of aquatic systems.

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Acknowledgements

Ana Lucia Santoro received a STINT (Sweden) and CNPq (Brazil) scholarships at the time of sampling. The authors would like to thank the Brazilian funding agencies CNPq, CAPES, FAPERJ and FAPESP for different kinds of financial support throughout the process of sampling, evaluation and paper writing.

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The contributions of the authors were as follows: All authors conceived and designed the experiments. Ana Lucia Santoro performed the experiments and analyzed the data. Alex Enrich-Prast, David Bastviken and Lars Tranvik contributed with reagents/materials/analysis tools. All authors wrote and revised previous versions of the paper. All authors read and approved the final manuscript.

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Correspondence to Camila Negrão Signori.

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The authors declare no conflicts of interest.

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Santoro, A.L., Enrich-Prast, A., Bastviken, D. et al. Spatial and vertical distribution of aerobic and anaerobic dark inorganic carbon fixation in coastal tropical lake sediments. Aquat Sci 83, 43 (2021). https://doi.org/10.1007/s00027-021-00803-w

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  • DOI: https://doi.org/10.1007/s00027-021-00803-w

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