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Top-down and bottom-up effects of fish on a macrophyte-mediated trophic network: a mesocosm approach

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Abstract

Trophic interaction in tropical regions is influenced by factors such as the size of organisms and the presence of intermediate predators. Macrophytes can act directly on predator–prey dynamics through the habitat structure provided by plants. We conducted an in situ mesocosm experiment (100 L) in a Brazilian reservoir to evaluate the top-down and bottom-up control promoted by the fish Astyanax lacustris, and to evaluate the effects of floating and submerged macrophytes’ morphology on trophic interaction. The experiment lasted ten days and consisted of four treatments in triplicate (n = 12): a control (C) without fish, with only the natural plankton community, and treatments with addition of fish (+ F), fish + floating macrophyte (+ FFM) and fish + submerged macrophyte (+ FSM). In treatments with macrophytes, artificial plants were added to serve as shelter for zooplankton and Chaoborus. Our results showed that fish reduced small cladoceran and Chaoborus biomass by top-down control and increased edible phytoplankton biomass by increasing nutrient concentrations by bottom-up control. Chaoborus increased the food chain length to four levels, with negative effects on the biomass of small cladocerans. Submerged macrophytes were more efficient in providing refuge for copepods and Chaoborus. In general, planktivorous fish had a direct effect on zooplankton and an indirect effect on phytoplankton, and the invertebrate Chaoborus interfered with the functioning of trophic networks. Our results show that, in experimental conditions, macrophytes can play a fundamental role in tropical reservoirs by reducing the strength of top-down control in the trophic cascade.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author (ariadne_moura@hotmail.com) on reasonable request.

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Acknowledgements

This work was supported by the Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco—FACEPE, Brazil (grant ID IBPG-0549-2.03/18 for the first author), and by Brazilian National Council of Technological and Scientific Development—CNPq, Brazil (grant ID PQ 305829/2019-0 for the second author). We grateful to the Laboratory of Limnology, Department of Fisheries and Aquaculture, Federal Rural University of Pernambuco—UFRPE, Brazil, for their support in nutrient analysis, and we also thank to anonymous reviewers who improve this manuscript with their comments and suggestions.

Funding

This work was supported by the Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco—FACEPE, Brazil (Grant ID IBPG-0549–2.03/18 for the first author), and by Brazilian National Council of Technological and Scientific Development—CNPq, Brazil (Grant ID PQ 305829/2019–0 for the second author).

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ASD: Conceptualization, Methodology, Validation, Formal analysis, Writing—Original Draft, Writing—Review & Editing, Visualization. ANM: Conceptualization, Methodology, Writing—Review & Editing, Supervision.

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Correspondence to Ariadne do Nascimento Moura.

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The authors declare that they have no conflict of interest.

Ethical approval

The use of fish was authorized by the Animal Use Ethics Committee of the Federal Rural University of Pernambuco (Process 23,082.025170/2018–77).

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Diniz, A.S., do Nascimento Moura, A. Top-down and bottom-up effects of fish on a macrophyte-mediated trophic network: a mesocosm approach. Aquat Ecol 56, 1157–1175 (2022). https://doi.org/10.1007/s10452-022-09976-4

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  • DOI: https://doi.org/10.1007/s10452-022-09976-4

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