Condition-dependent responses of fish to motorboats

Author:

Harding H. R.12ORCID,Gordon T. A. C.34ORCID,Wong K.5,McCormick M. I.6,Simpson S. D.3,Radford A. N.1ORCID

Affiliation:

1. School of Biological Sciences, University of Bristol, 24 Tyndall Avenue, Bristol BS8 1TQ, UK

2. Marine Scotland Science, 375 Victoria Road, Aberdeen AB11 9DB, UK

3. Biosciences, University of Exeter, Hatherly Laboratories, Prince of Wales Road, Exeter EX4 4PS, UK

4. Australian Institute of Marine Science, Perth WA 6009, Australia

5. Department of Biology, Duke University, Durham NC 27708, USA

6. ARC Centre for Coral Reef Studies, James Cook University, Queensland 4811, Australia

Abstract

Anthropogenic noise is a pollutant of global concern that has been shown to have a wide range of detrimental effects on multiple taxa. However, most noise studies to-date consider only overall population means, ignoring the potential for intraspecific variation in responses. Here, we used field experiments on Australia's Great Barrier Reef to assess condition-dependent responses of blue-green damselfish ( Chromis viridis ) to real motorboats. Despite finding no effect of motorboats on a physiological measure (opercular beat rate; OBR), we found a condition-dependent effect on anti-predator behaviour. In ambient conditions, startle responses to a looming stimulus were equivalent for relatively poor- and good-condition fish, but when motorboats were passing, poorer-condition fish startled at significantly shorter distances to the looming stimulus than better-condition fish. This greater susceptibility to motorboats in poorer-condition fish may be the result of generally more elevated stress levels, as poorer-condition fish had a higher pre-testing OBR than those in better condition. Considering intraspecific variation in responses is important to avoid misrepresenting potential effects of anthropogenic noise and to ensure the best management and mitigation of this pervasive pollutant.

Funder

Natural Environment Research Council

Australian Research Council

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,Agricultural and Biological Sciences (miscellaneous)

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