Diel variation in echolocation behavior of wild harbor porpoises
作者： Julia Carlstrom
DOI: 10.1111/J.1748-7692.2005.TB01204.X
关键词:
摘要: The echolocation rate and behavior of wild harbor porpoises were studied using a porpoise click detector (POD) deployed close to the bottom at 40 m depth in Scottish waters, UK, April—June 2001. Echolocation variables compared among four diel phases; morning, day, evening, night. encounter rate, minimum interclick interval per train, proportion trains with below 10 msec all significantly higher night than during day. variation implies that increased their and/or visited POD more often Further, changes train suggest they used for foraging or investigating objects range extent, acoustically explored environment greater distances
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