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A Comparison of the Seasonal Movements of Tiger Sharks and Green Turtles Provides Insight into Their Predator-Prey Relationship

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dc.contributor Commonwealth Scientific & Industrial Research Organisation (csiro)
dc.contributor Deakin Univ
dc.contributor Inst Marine & Antarct Studies
dc.contributor University Of Tasmania
dc.contributor Reef Channel
dc.contributor Australian Inst Marine Sci
dc.contributor Sch Life & Environm Sci
dc.contributor University Of Western Australia
dc.contributor James Cook Univ
dc.contributor Univ Western Australia
dc.contributor Marine & Atmospher Res
dc.contributor James Cook University
dc.contributor Univ Tasmania
dc.contributor Queensland Dept Environm & Heritage Protect
dc.contributor Sch Marine & Trop Biol
dc.contributor Csiro
dc.contributor Oceans Inst
dc.contributor Australian Institute Of Marine Science
dc.contributor Fisheries Aquaculture & Coasts Ctr
dc.contributor Sch Environm Syst Engn
dc.contributor Deakin University
dc.contributor Australian Institute Of Marine Science (aims) en BARNETT, ADAM FITZPATRICK, RICHARD THUMS, MICHELE BELL, IAN MEEKAN, MARK G. STEVENS, JOHN D. 2017-03-21T01:09:34Z 2017-03-21T01:09:34Z 2013-02-28T06:55:33Z 2019-05-09T01:19:03Z 2017-03-21T01:09:34Z 2017-03-21T01:09:34Z 2013-02-28T06:55:33Z 2019-05-09T01:19:03Z 2012-12-19
dc.identifier 9345 en
dc.identifier.citation Fitzpatrick R, Thums M, Bell I, Meekan MG, Stevens JD and Barnett A (2012) A comparison of the seasonal movements of tiger sharks and green turtles provides insight into their predator-prey relationship. PLoS ONE. 7: e51927. en
dc.identifier.issn 1932-6203
dc.description.abstract During the reproductive season, sea turtles use a restricted area in the vicinity of their nesting beaches, making them vulnerable to predation. At Raine Island (Australia), the highest density green turtle Chelonia mydas rookery in the world, tiger sharks Galeocerdo cuvier have been observed to feed on green turtles, and it has been suggested that they may specialise on such air-breathing prey. However there is little information with which to examine this hypothesis. We compared the spatial and temporal components of movement behaviour of these two potentially interacting species in order to provide insight into the predator-prey relationship. Specifically, we tested the hypothesis that tiger shark movements are more concentrated at Raine Island during the green turtle nesting season than outside the turtle nesting season when turtles are not concentrated at Raine Island. Turtles showed area-restricted search behaviour around Raine Island for similar to 3-4 months during the nesting period (November-February). This was followed by direct movement (transit) to putative foraging grounds mostly in the Torres Straight where they switched to area-restricted search mode again, and remained resident for the remainder of the deployment (53-304 days). In contrast, tiger sharks displayed high spatial and temporal variation in movement behaviour which was not closely linked to the movement behaviour of green turtles or recognised turtle foraging grounds. On average, tiger sharks were concentrated around Raine Island throughout the year. While information on diet is required to determine whether tiger sharks are turtle specialists our results support the hypothesis that they target this predictable and plentiful prey during turtle nesting season, but they might not focus on this less predictable food source outside the nesting season.
dc.description.sponsorship Funding for this project was from a commercial source, Digital Dimensions. RF and AB are affiliated with a commercial company The Reef Channel. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.
dc.description.sponsorship Funding was supplied by Digital Dimensions, Australia, through the production of documentaries related to shark research. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
dc.language English
dc.language en en
dc.relation.ispartof PLoS ONE - pages: 7: e51927 en
dc.relation.ispartof Null
dc.subject Ecosystem
dc.subject Galeocerdo-cuvier
dc.subject State-space Models
dc.subject Ecology
dc.subject Science & Technology - Other Topics
dc.subject Habitat Use
dc.subject Multidisciplinary Sciences
dc.subject Patterns
dc.subject Apex Predator
dc.subject Hawaii
dc.subject Foraging Behavior
dc.subject Waters
dc.title A Comparison of the Seasonal Movements of Tiger Sharks and Green Turtles Provides Insight into Their Predator-Prey Relationship
dc.type journal article en
dc.identifier.doi 10.1371/journal.pone.0051927
dc.identifier.wos WOS:000312694300059

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