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White Sharks Exploit the Sun during Predatory Approaches
Charlie Huveneers, Dirk Holman, Rachel Robbins, Andrew Fox, John A. Endler and Alex H. Taylor
The American Naturalist
Vol. 185, No. 4 (April 2015), pp. 562-570
Stable URL: http://www.jstor.org/stable/10.1086/680010
Page Count: 9
You can always find the topics here!Topics: Sharks, Sun, Predation, Statistical variance, Cloud cover, Boats, Glare, Predators, Tuna, Foraging
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AbstractThere is no conclusive evidence of any nonhuman animal using the sun as part of its predation strategy. Here, we show that the world’s largest predatory fish—the white shark (Carcharodon carcharias)—exploits the sun when approaching baits by positioning the sun directly behind them. On sunny days, sharks reversed their direction of approach along an east-west axis from morning to afternoon but had uniformly distributed approach directions during overcast conditions. These results show that white sharks have sufficient behavioral flexibility to exploit fluctuating environmental features when predating. This sun-tracking predation strategy has a number of potential functional roles, including improvement of prey detection, avoidance of retinal overstimulation, and predator concealment.
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