Negative effect of turbidity on prey capture for both visual and non-visual aquatic predators
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2020
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1. Turbidity plays an important role in aquatic predator–prey interactions. Increases
in turbidity are expected to reduce prey capture rates, especially for visually
oriented predators. However, there is also evidence indicating that turbidity may
have little or no effect on predation rates.
2. Here, we conducted a systematic review and meta-analysis of the relationship
between turbidity and capture rate. We explored possible sources of heterogeneity in the effect sizes (capture strategy, predator's body size, relative eye size and
turbidity range in the experiments) while controlling for the dependence among
effects sizes and phylogenetic relationships among predator species.
3. We found a consistent negative effect of turbidity on prey capture and that turbidity range (manipulated in the experiments) was the main factor accounting for
between-study variation in effect sizes. Also, capture rates of both visually and
non-visually oriented predators decreased with an increase in turbidity. In addition, for visually oriented fish predators, the relative eye size did not influence the
effect sizes.
4. Despite the paucity of studies for some groups of aquatic predators (mainly in
tropical regions), we provide corroborative evidence that turbidity is a critical environmental factor controlling predator–prey interactions. This result is especially
relevant considering that changes in turbidity is a human-induced pervasive environmental alteration resulted from, among other mechanisms, runoff after deforestation, eutrophication or oligotrophication in reservoir cascades, which imply
changes in predator–prey interactions.
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Freshwater, Water transparency, Marine, Meta-analysis, Predation, Predator–prey interactions
Citação
G. ORTEGA, Jean C. et al. Negative effect of turbidity on prey capture for both visual and non-visual aquatic predators. Journal of Animal Ecology, Hoboken, v. 89, p. 2427-2439, 2020. DOI: 10.1111/1365-2656.13329. Disponível em: https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2656.13329. Acesso em: 5 jul. 2023.