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More than mimic.y？ Evaluating sc.pe for flic.er-fusion as a defensive strategy in c.ral snake mimic.

c.rrent Zoology 2014年第1期60卷 123-130页

作者： georgia c. titcomb david w. kikuchi david w. pfennig Department of Biology University of North Carolina at Chapel Hill Chapel Hill NC 27599-3280

c.ral snakes and their mimic. often have brightly c.lored banded patterns, generally assoc.ated w.th w.rning c.lora- tion or mimic.y. How.ver, suc. c.lor patterns have also been hypothesized to aid snakes in esc.ping predators through a ＂flic.er-fusion＂ effec.. Ac.ording to this hypothesis, banded c.lor patterns c.nfuse potential predators w.en a snake transitions from resting to moving bec.use its bands blur together to form a different c.lor. To produc. this motion blur, a moving snake＇s bands must transition faster than the c.itic.l flic.er-fusion rate at w.ic. a predator＇s photorec.ptors c.n refresh. It is unknow. if c.ral snakes or their mimic. meet this requirement. w. tested this hypothesis by measuring the movement speed and c.lor pat- terns of tw. c.ral snake mimic., Lampropeltis triangulum c.mpbelli and L. elapsoides, and c.mparing the frequenc. of c.lor transitions to the photorec.ptor ac.ivity of the avian eye. w. found that snakes often produc.d a motion blur, but moving snakes c.eated a blurring effec. more often in darker c.nditions, suc. as sunrise, sunset, and nighttime w.en these snakes are often ac.ive. Thus, at least tw. spec.es of c.ral snake mimic. are c.pable of ac.ieving flic.er-fusion, indic.ting that their c.lor patterns may c.nfer an additional defense aside from mimic.y

关键词： c.ral snake mimic.y Flic.er-fusion effec. c.F Kingsnake Defensive strategy

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