lect_7_wirsing_sust_soc_2009.ppt

lect_7_wirsing_sust_soc_2009.ppt - Attitudes Toward Sharks...

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Attitudes Toward Sharks and the Sustainability of the World’s Fisheries
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The Real Predator ~ 100 shark attacks per year ~ 15 humans per year killed by sharks Each human death revisited on shark populations 6 million-fold! TIME, August 11, 1997
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Shark Declines: Magnitude Hammerhead, white, and thresher sharks down ~ 75% in North Atlantic 1 Hammerhead, blue, and thresher sharks down 96-99% in Mediteranean Sea 2 Oceanic whitetip and silky sharks down 90- 99% in Gulf of Mexico 3 1 Baum et al. (2003) Science 2 Feretti et al. (2008) Cons Biol 3 Baum and Myers (2004) Ecol Lett
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Shark Declines: Consequences Declines can affect fish populations by Releasing mesopredators (i.e., medium- sized consumers)
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Mesopredator Release Myers et al. (2007) Science Scalloped hammerhead ( Sphyrna lewini ) Bay scallops ( Agropecten irradians ) (fishery has collapsed) Cownose ray ( Rhinoptera bonasus )
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Large Shark Declines Can affect fish populations by Releasing mesopredators (i.e., medium- sized consumers) Altering behavior of consumers in ways that affect fish numbers or habitat
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Large Shark Declines Can affect fish populations by Releasing mesopredators (i.e., medium- sized consumers) Altering behavior of consumers in ways that affect fish numbers or habitat - Underappreciated - Basis for rest of talk
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Goals for Today Present work from Shark Bay, Western
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lect_7_wirsing_sust_soc_2009.ppt - Attitudes Toward Sharks...

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