Long-term individual identification and site fidelity of white sharks, <Emphasis Type="Italic">Carcharodon carcharias</Emphasis>, off California using dorsal fins |
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| Authors: | Scot D Anderson Taylor K Chapple Salvador J Jorgensen A Peter Klimley Barbara A Block |
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| Institution: | (1) P.O. Box 390, Inverness, CA 94937, USA;(2) Wildlife, Fish and Conservation Biology, University of California Davis, One Shields Ave, Davis, CA 95616, USA;(3) Max Planck Institute for Ornithology, Schlossallee 1a, 78315 Radolfzell, Germany;(4) Hopkins Marine Station of Stanford University, 120 Oceanview Blvd., Pacific Grove, CA 93950, USA;(5) Monterey Bay Aquarium, 886 Cannery Row, Monterey, CA 93940, USA |
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| Abstract: | Mark-recapture techniques can be used to estimate white shark (Carcharodon carcharias) population abundance. These frameworks are based on assumptions that marks are conserved and animals are present at the
sampling location over the entire duration of the study. Though these assumptions have been validated across short-time scales
for white sharks, long-term studies of population trends are dependent on these assumptions being valid across longer periods.
We use 22 years of photographic data from aggregation sites in central California to support the use of dorsal fin morphology
as long-term individual identifiers. We identified five individuals over 16–22 years, which support the use of dorsal fins
as long-time individual identifiers, illustrate strong yearly site fidelity to coastal aggregation sites across extended time
periods (decades), and provide the first empirical validation of white shark longevity >22 years. These findings support the
use of fin morphology in mark-recapture frameworks for white sharks. |
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