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Marine parks for reef sharks: shark movements at Ningaloo Reef Conrad Speed, Mark Meekan, Iain Field, Clive McMahon, Rob Harcourt, John Stevens, Richard Pillans, Russ Babcock, Rory McAuley, Corey Bradshaw
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Threats at Ningaloo No commercial shark fisheries Development Recreational fishing ~18,000 fishers P/Y (Smallwood & Beckley 2012) 4.2 % recapture rate vs 5.5 % for commercial fishery (Stevens et al. 2000)
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Background MPA design requires ecological data Movement patterns lacking for most species Spatial and temporal patterns Acoustic monitoring (AATAMS)
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Ningaloo Marine Park NMP established 1987 Sanctuary area 883.65 km 2 (34%) Mangrove Sanctuary 11.35 km 2 Mangrove habitat / reef / sand NMP mangrove habitat < 1%
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High diversity Carcharhinus amblyrhynchos Carcharhinus melanopterus Negaprion acutidens
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Objectives Sanctuary use by reef sharks Sanctuary more effective for juveniles? HR smaller for juveniles? Residency higher for smaller sharks? Long-distance movements adults?
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Tagging & monitoring
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Tagged sharks Blacktips (n=10) adults and juveniles Greys (n=10) adults & juveniles Lemons (n=5) all juveniles
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Temporal detections
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Diel patterns
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Sanctuary use by residents (n=12) Greys 93 % (n=2) Blacktips 45 % (n=7) Lemons 63% (n=3) <1 % in sanctuary 58 % in sanctuary 98 % in sanctuary
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Kernel ‘hot spots’
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Home range ? Adults = 12.8 km 2 (±3.12) Juveniles = 7.2 km 2 (±1.33) MCP =19.56 km 2 MCP =0.61 km 2 (±0.04)
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Long-distance movements 260 km Pupping? X 5 Adult females
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Long-distance movements Tag #SpeciesMLD (km) 8229C. amblyrhynchos80.5 53414C. amblyrhynchos61.8 53351C. amblyrhynchos12.8 53355C. amblyrhynchos11.3 53347C. melanopterus137.8 53361C. melanopterus61.8 53344C. melanopterus16.1 8218C. melanopterus13.2
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Conclusions Highlighted need for ecological data for MPA design Site fidelity & residency high Sanctuary offers greater protection for juveniles Long-distance movements (pupping?) Extend sanctuary southward
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Acknowledgements
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