A predatory use of counterillumination by the squaloid shark, Isistius brasiliensis |
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Authors: | Edith A. Widder |
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Affiliation: | (1) Harbor Branch Oceanographic Institution, 5600 US 1 North, Fort Pierce, FL, 34946, U.S.A. |
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Abstract: | A number of very unusual morphological and behavioral characteristics attributed to the cookie-cutter shark, Isistius brasiliensis, may be explained by a novel use of counterillumination. Specifically, it is proposed that a band of pigment, located beneath the jaw and bounded by ventrally directed bioluminescence, acts as a lure which mimics the search image of many upward-looking pelagic predators. |
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Keywords: | bioluminescence cookie-cutter shark lure mimic vertical migration |
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