Mobile marine predators:an understudied source of nutrients to coral reefs in an unfished atoll

Williams, Jessica J. and Papastamatiou, Yannis P. and Caselle, Jennifer E. and Bradley, Darcy and Jacoby, David M. P. (2018) Mobile marine predators:an understudied source of nutrients to coral reefs in an unfished atoll. Proceedings of the Royal Society B: Biological Sciences, 285 (1875). ISSN 0962-8452

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Abstract

Animal movements can facilitate important ecological processes, and wide-ranging marine predators, such as sharks, potentially contribute significantly towards nutrient transfer between habitats. We applied network theory to 4 years of acoustic telemetry data for grey reef sharks (Carcharhinus amblyrhynchos) at Palmyra, an unfished atoll, to assess their potential role in nutrient dynamics throughout this remote ecosystem. We evaluated the dynamics of habitat connectivity and used network metrics to quantify shark-mediated nutrient distribution. Predator movements were consistent within year, but differed between years and by sex. Females used higher numbers of routes throughout the system, distributing nutrients over a larger proportion of the atoll. Extrapolations of tagged sharks to the population level suggest that prey consumption and subsequent egestion leads to the heterogeneous deposition of 94.5 kg d−1 of nitrogen around the atoll, with approximately 86% of this probably derived from pelagic resources. These results suggest that sharks may contribute substantially to nutrient transfer from offshore waters to near-shore reefs, subsidies that are important for coral reef health.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2700
Subjects:
ID Code:
165457
Deposited By:
Deposited On:
03 Feb 2022 15:25
Refereed?:
Yes
Published?:
Published
Last Modified:
03 May 2022 03:29