Abstract
Complex habitats serve as a refuge by impeding predator movement and the detection and capture of prey. The attributes that make up these habitats often covary and are difficult to evaluate. The purpose of our study was to understand how attributes of habitat structure contribute to the survival of a temperate rocky reef fish, the bluebanded goby, Lythrypnus dalli. We first used natural substrata (rock) and then artificial standardized habitat units (SHUs) to explore attributes that likely reduce predation of L. dalli. Survival was positively related to the size of rock, but multiple attributes covaried, including rugosity, interstitial space between rocks, total surface area, rock height, and the number of rocks per plot. Using SHUs, we manipulated gap distance (to limit predator access) and potential refuge volume (interstitial space) orthogonally between artificial ‘rocks’ while controlling other habitat attributes. Degree of predator access (PA) was more influential on survival of individuals when combined with low interstitial space (IS) than high, but a combination of low IS and low PA was necessary for consistently high survival. We also conducted a behavioral laboratory experiment to ascertain whether the distribution of L. dalli among configurations of habitat differed in the presence and absence of an important predator, the kelp bass, Paralabrax clathratus. Individuals selected habitat configurations with low spacing between structures, consistent with survival patterns observed in the field. Our study indicates that habitat attributes vary in their importance to survival, but their combined effects may be greater than those of any single attribute.
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Acknowledgments
We thank S. Boom, E. Floyd, N. Bakkour, and J. Young for their tireless assistance in the field, D. Deutschman and M. Edwards for statistical advice, and B. Hentschel and J. Mahaffy for reviewing the manuscript. We especially thank K.A. Miller for her logistical support, C. Gramlich for her patience and diving expertise, and J. Zimmer for his proficiency in construction of materials. This study was funded through a graduate internship at the Wrigley Marine Science Center (to C.A.G.) and by a scholarship from the San Diego, California chapter of Achievement Rewards for College Scientists (to C.A.G.). Additional support was provided by grants to T.W.A. from the National Undersea Research Program, West Coast and Polar Regions Center (UAF(CA)-03-02), the National Institute for Undersea Science and Technology (05-07-006), and the National Science Foundation (OCE-0331895). We cite permission to collect and utilize study organisms from the California Department of Fish and Wildlife and commitment to ethical procedures required by CDFW and San Diego State University at the time this research was conducted. Contribution No. 253 of the University of Southern California Wrigley Institute for Environmental Studies.
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Gregor, C.A., Anderson, T.W. Relative importance of habitat attributes to predation risk in a temperate reef fish. Environ Biol Fish 99, 539–556 (2016). https://doi.org/10.1007/s10641-016-0496-7
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DOI: https://doi.org/10.1007/s10641-016-0496-7