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Spatial cognitive abilities of a tide-pool fish show resilience to noise pollution

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Abstract

Noise pollution may impair the cognitive performances of several animal species, producing suboptimal behavioral responses. Involuntary shifts in attention from noise pollution (an irrelevant stimulus) may account for this outcome, specifically, by reducing the available cognitive processing capacity to conduct relevant tasks; the ‘distracted prey hypothesis’. Many reef fish mediate predation risks by pairing with conspecifics and using refuges; two crucially important resources that are often heterogeneously distributed in space. In a T-maze, we tested the cognitive performances of wild-caught tide-pool fish, Sergeant Major (Abudefduf saxatilis), exposed to control (45 dBA) or noise playbacks (100 dBA). After exposure to a model predator, fish could reach an area containing a refuge and conspecifics (target area), located in one arm of the maze. We posited that fish exposed to noise playbacks would require additional time to reach this target, because of impaired cognitive performances (i.e., learning, remembering). While fish learned to reach the target, no statistical difference existed between acoustic treatments. However, fish exposed to additional noise increased their time spent under shelter and reduced their exploratory behavior. As tide-pools are inherently noisy and structurally complex, residents of these habitats may have cognitive abilities that are resilient to acoustic disturbances.

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Acknowledgments

We are grateful to the Institute of Biology of the Federal University of Bahia for allowing us to use the infrastructures to conduct this experiment, to Hans Slabbekoorn for providing the acoustic stimulus, and to James Campbell for insightful comments on the hydro-acoustics of small tanks. AOHCL is grateful for a CAPES PNPD Fellowship (88882.305953/2018-01). The capture of fish was authorized by the Institute Chico Mendes for Conservation of Biodiversity (License no 55979-1) and all procedures were approved by UFBA Ethic Committee (no 40-2017).

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Correspondence to Antoine O. H. C. Leduc.

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Leduc, A.O.H.C., Costa, J.S.O., do Nascimento Silva, R.R. et al. Spatial cognitive abilities of a tide-pool fish show resilience to noise pollution. J Ethol 39, 225–234 (2021). https://doi.org/10.1007/s10164-021-00697-z

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  • DOI: https://doi.org/10.1007/s10164-021-00697-z

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