Journal of Ecology and Environment

한국생태학회 (The Ecological Society of Korea)
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Anti-Predator Responses of Black-Tailed Gull (Larus crassirostris) Flocks to Alarm Calls during the Post-Breeding Season

  • Park, Shi-Ryong (Department of Biology Education, Korea National University of Education) ;
  • Chung, Hoon (Department of Applied Animal Science, Sahmyook University) ;
  • Cheong, Seok-Wan (Department of Biology Education, Korea National University of Education) ;
  • Lee, Song-Yi (Department of Biology Education, Korea National University of Education) ;
  • Sung, Ha-Cheol (Department of Biology Education, Korea National University of Education)
  • 발행 : 2007.02.28
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초록

Black-tailed gulls (Larus crassirostris) produce alarm calls apparently related to their anti-predator behaviors, but the hypothesis that the calls are actually used as functionally referential alarm signals has not yet been tested. In this study, we performed a series of experiments using visual (a stuffed goshawk: Accipiter gentilis) and acoustic (alarm calls and a control vocalization) stimuli at 15 sites in Sinjindo-ri and Dowhang-ri, Taean-gun, Chungnam province to examine anti-predator responses of the gulls to alarm calls in playback trials. We found that the gulls' visual recognition of a perched hawk model in the absence of alarm vocalizations was weak or absent because the model was noticed in only two out of 16 trials. The gulls' responses to playbacks of the alarm call only and the alarm call with a visual stimulus differed from responses to the control vocalization in latency to approach, time mobbing, and the percentage of gulls responding, while the responses to alarm call only differed from alarm call with a visual stimulus in latency to first fly, latency to call, and time mobbing. The results of this study suggest that alarm calls of black-tailed gulls are used to elicit appropriate anti-predator behaviors that are intensified when a predator is detected visually.

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