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Vertical Movement Patterns and Ontogenetic Niche Expansion in the Tiger Shark, Galeocerdo cuvier

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  • André S Afonso
  • Fábio H V Hazin

Abstract

Sharks are top predators in many marine ecosystems and can impact community dynamics, yet many shark populations are undergoing severe declines primarily due to overfishing. Obtaining species-specific knowledge on shark spatial ecology is important to implement adequate management strategies for the effective conservation of these taxa. This is particularly relevant concerning highly-mobile species that use wide home ranges comprising coastal and oceanic habitats, such as tiger sharks, Galeocerdo cuvier. We deployed satellite tags in 20 juvenile tiger sharks off northeastern Brazil to assess the effect of intrinsic and extrinsic factors on depth and temperature usage. Sharks were tracked for a total of 1184 d and used waters up to 1112 m in depth. The minimum temperature recorded equaled 4°C. All sharks had a clear preference for surface (

Suggested Citation

  • André S Afonso & Fábio H V Hazin, 2015. "Vertical Movement Patterns and Ontogenetic Niche Expansion in the Tiger Shark, Galeocerdo cuvier," PLOS ONE, Public Library of Science, vol. 10(1), pages 1-26, January.
  • Handle: RePEc:plo:pone00:0116720
    DOI: 10.1371/journal.pone.0116720
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    References listed on IDEAS

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    1. Worm, Boris & Davis, Brendal & Kettemer, Lisa & Ward-Paige, Christine A. & Chapman, Demian & Heithaus, Michael R. & Kessel, Steven T. & Gruber, Samuel H., 2013. "Global catches, exploitation rates, and rebuilding options for sharks," Marine Policy, Elsevier, vol. 40(C), pages 194-204.
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