Abstract
Cleaning symbioses on coral reefs involve small cleaner fish or shrimps picking ectoparasites from the exterior surfaces of larger client organisms. These mutualisms are thought to evolve in part because the cleaner receives a reliable source of profitable prey items and immunity from predation. However, the benefits of cleaning behavior have never been measured relative to those of alternative, non-cleaning strategies. This study examined these costs and benefits in the sharknose goby, Elacatinus evelynae, a facultative cleaner fish, at the Caribbean island of St. Croix. Sharknose gobies are found on coral heads, where they maintain cleaning stations, and on basket sponges, where they spend little time cleaning and feed predominantly on nonparasitic copepods. For immature gobies that are not allocating energy to reproduction, hindcast otolith growth rates (a reliable proxy for somatic growth) were significantly higher for non-cleaning sponge-dwellers than for coral-dwellers. Furthermore, tagging large, competitively dominant gobies on sponges and corals revealed that mortality rates were higher for coral-dwelling gobies. These unexpected results provide further evidence that cleaning mutualisms are context dependent: far from being a uniformly profitable life history strategy, cleaning may be a suboptimal choice at some times and places.
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Acknowledgments
We thank S. Hamilton and J. Samhouri for assistance with otolith analysis and expert advice throughout the study. S. Brander, P. Munday, A. Rassweiler, and two anonymous reviewers provided helpful comments on the manuscript. This is contribution 231 from the Partnership for Interdisciplinary Study of Coastal Oceans, funded primarily by the Gordon and Betty Moore Foundation and the David and Lucile Packard Foundation.
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White, J.W., Grigsby, C.J. & Warner, R.R. Cleaning behavior is riskier and less profitable than an alternative strategy for a facultative cleaner fish. Coral Reefs 26, 87–94 (2007). https://doi.org/10.1007/s00338-006-0161-2
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DOI: https://doi.org/10.1007/s00338-006-0161-2