Abstract
Reductions in aquatic habitat size facilitate encounters between predators and prey by reducing the height of the water column and the water volume. Here, we proposed to disentangle the effects of these mechanisms on predation rates and parameters of functional response curves of predators. We paired active-search predators (Buenoa, Hemiptera) or ambush predators (Pantala and Lestes, Odonata) with prey of different mobility types (Argyrodiaptomus, Copepoda; Culex, Diptera). Three treatments were established: high water column height and high water volume (H + V +), low water column height and high water volume (H − V +), and low water column height and low water volume (H − V−). We used contrast analysis to separate the effects of water column height (H + , H−) and water volume (V + , V−). Predation rates were higher in V− than in V + for Pantala and Buenoa consuming Argyrodiaptomus. In addition, we observed an increase in attack rates and a decrease in handling time in V− in relation to V + for Pantala and Lestes consuming Argyrodiaptomus. We concluded that reduction in the water volume was main responsible factor for the changes in predator–prey interactions. These changes depended on the prey behavior and predator foraging modes: ambush predators were the most benefited, and highly mobile prey were the most consumed.
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The datasets generated during and/or analysed during the current study are available in the Zenodo repository, https://doi.org/10.5281/zenodo.5879944.
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Acknowledgements
RMGC and JLSF are grateful to Vale S.A. and the Coordination of Superior Level Staff Improvement (CAPES) for Master and PhD scholarships, respectively. VFF is partially supported by a CNPq productivity grant (Process 310119/2018-9).
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All authors conceived the ideas and designed the methodology; RMGC and JLSF collected and analyzed the data; RMGC led the writing of the manuscript. All authors contributed critically to the drafts and gave final approval for publication.
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Costa, R.M.G., Ferro, J.L.S. & Farjalla, V.F. Disentangling the mechanisms related to the reduction of aquatic habitat size on predator–prey interactions. Hydrobiologia 849, 1207–1219 (2022). https://doi.org/10.1007/s10750-021-04781-w
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DOI: https://doi.org/10.1007/s10750-021-04781-w