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Population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia

Meekan, Mark G., Bradshaw, Corey J. A., Press, Michelle, McLean, Cary, Richards, Allison, Quasnichka, Suzy and Taylor, J. Geoff (2006). Population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia. Marine Ecology: Progress Series,319:275-285.

Document type: Journal Article
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Title Population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia
Author Meekan, Mark G.
Bradshaw, Corey J. A.
Press, Michelle
McLean, Cary
Richards, Allison
Quasnichka, Suzy
Taylor, J. Geoff
Journal Name Marine Ecology: Progress Series
Publication Date 2006
Volume Number 319
ISSN 0171-8630   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33748974401
Start Page 275
End Page 285
Total Pages 11
Place of Publication Oldendorf, Germany
Publisher Inter-Research
Field of Research 0602 - Ecology
HERDC Category C1 - Journal Article (DEST)
Abstract We used photo-identification to produce estimates of population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia. We analysed photographs of whale sharks taken from 1992 to 2004. A combination of spot and stripe patterns behind the last gill slit and forward of the dorsal fin (lateral view), and distinctive scars and marks on the body and fins were useful for identifying individual sharks. These patterns appeared to be unique to individuals and distinctive markings could be recognized on some sharks for more than a decade. From 581 photographs, 159 individuals were identified. Of these, 74% were male, 16% were female and 10% were of indeterminate gender. Photographed sharks ranged in estimated size from 3 to 10 m total length (TL). The size distribution of sharks was bimodal with a large peak at 8 m and a smaller peak at 6 m TL. Sixty individuals were resighted during the study. Of these, 46 were resighted at different times during the same year (sometimes on multiple occasions) up to 4 mo after they were initially photographed, and 33 were resighted (4 on > 2 occasions) in different years. The interval between inter-annual resightings was typically 1 to 3 yr; however, 2 sharks were resighted after a period of 12 yr. We estimated the super population of whale sharks that visit Ningaloo Reef to consist of approximately 300 to 500 individuals (95% confidence interval) based on closed population models, or 320 to 440 based on Jolly-Seber open-population models. Our study shows that photo-identification offers a practical, non-invasive and non-destructive means to obtain data on the population size and demography of whale sharks.
Keywords Abundance
Cormack-Jolly-Seber models
Lincoln-Peterson estimator
Mark-recapture models
Photo-identification
Program MARK
Sex ratio
Whale shark
DOI http://dx.doi.org/10.3354/meps319275   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes Copyright by Inter-Research - Meekan, Mark G., Bradshaw, Corey J.A., Press, Michelle, McLean, Cary, Richards, Allison, Quasnichka, Suzy, Taylor R. Geoff - Population size and structure of whale sharks Rhincodon typus at Ningaloo Reef, Western Australia – MEPS 319:275-285 (2006) -http://www.int-res.com/abstracts/meps/v319/p275-285/


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