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Strong top-down effects of omnivorous fish and macroinvertebrates on periphytic algae and macrophytes in a tropical reservoir

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Abstract

Top-chain predators play a fundamental role in the functioning of shallow reservoirs. Studies to elucidate the cascade effects produced by fish on macroinvertebrates and periphytic algae are fundamental for understanding the functioning of aquatic ecosystems. We conducted an enclosure experiment to test the isolated and combined effects of macroinvertebrates and Prochilodus brevis (omnivorous fish) on periphytic algae and the floating macrophyte Eichhornia crassipes for 30 days in the Jazigo reservoir, Brazil. The predation of P. brevis on macroinvertebrates increased the biomass of periphytic algae during the experiment, while the effects of isolated macroinvertebrates decreased the biomass of periphytic algae and increased the biomass of E. crassipes. Macroinvertebrates (which freely colonized the enclosures) were reduced by fish; however, the biomass of the periphytic algae was not reduced. Our results showed that P. brevis has strong effects on the structure of macroinvertebrate and periphytic algae communities, with a visible cascade effect on the abundance of macroinvertebrates. This study contributes to our understanding of the ecology of tropical lakes and the regulation of periphytic algae and macrophyte growth.

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Data, associated metadata and calculation tools will be made available on request to the corresponding author (ariadne_moura@hotmail.com).

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Acknowledgements

This work was supported by the Brazilian National Council of Technological and Scientific Development-CNPq, Brazil (grant ID 305829/ 2019-0), and financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Finance Code 001, which granted a scholarship to SLNF. We also thank the anonymous reviewers for their valuable comments and suggestions on our article.

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Contributions

SLNF: Conceptualization, Methodology, Validation, Data curation, Formal analysis, Writing-original draft, Writing-review and editing. ADNM: Conceptualization, Supervision, Methodology, Writing-review and editing.

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Correspondence to Ariadne do Nascimento Moura.

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The authors declare that they have no conflict of interest.

Ethics approval

The use of fish was authorized by the Animal Use Ethics Committee of the Federal Rural University of Pernambuco (Process 23082.009799/2018-70).

Research Involving Human Participants and/or Animals

The use of fish was authorized by the Animal Use Ethics Committee of the Federal Rural University of Pernambuco (Process 23082.009799/2018-70).

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10452_2021_9853_MOESM1_ESM.pdf

Abiotic water limnological variables during the experiment in the Jazigo reservoir. DIN: dissolved inorganic nitrogen (± standard deviation) (PDF 15 kb)

10452_2021_9853_MOESM2_ESM.pdf

Abundance of macroinvertebrates with herbivorous, detritivorous and carnivorous eating habits during the experiment in treatments C (control), F (fish only), M (macroinvertebrates only) and MF (macroinvertebrates + fish) (PDF 14 kb)

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do Nascimento Filho, S.L., do Nascimento Moura, A. Strong top-down effects of omnivorous fish and macroinvertebrates on periphytic algae and macrophytes in a tropical reservoir. Aquat Ecol 55, 667–680 (2021). https://doi.org/10.1007/s10452-021-09853-6

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  • DOI: https://doi.org/10.1007/s10452-021-09853-6

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