期刊
MARINE ECOLOGY PROGRESS SERIES
卷 644, 期 -, 页码 215-228出版社
INTER-RESEARCH
DOI: 10.3354/meps13346
关键词
Food-safety tradeoff; Gray seal; Halichoerus grypus; White shark; Carcharodon carcharias; Predation risk; Behavioral ecology
资金
- Bureau of Ocean Energy Management
- International Fund for Animal Welfare
- Oak Foundation
- Federal Aid in Sport Fish Restoration
- John J. Sacco and Edith L. Sacco Charitable Foundation
- Atlantic White Shark Conservancy
White sharks Carcharodon carcharias and gray seals Halichoerus grypus are re-establishing their ecological roles within the Northwestern Atlantic Ocean, presenting an opportunity to understand gray seal movement and at-sea behavior under predation risk. As with other shark-seal hotspots, movements to and from terrestrial haul outs can be risky for gray seals, thereby eliciting antipredator strategies. We investigated the movement and coastal behavior of gray seals on Cape Cod (USA) in relation to seasonal and diel changes in white shark activity. Analyzing 412 trips to sea by 8 seals and more than 25000 acoustic detections from 23 individual white sharks, we observed seasonally homogeneous movements in seal behavior during months with greater shark presence. During riskier months, seal behavior manifested in near-exclusive nocturnal foraging, reduced offshore ranging, and limited at-sea activity. On these nocturnal trips to sea, seals returning to haul outs tended to avoid daybreak and traversed during diel minima in shark activity. However, seals tended to depart haul outs at dusk when shark presence was maximal. As conservation efforts succeed in rebuilding depleted populations of coastal predators, studying re-emerging predator-prey interactions can enhance our understanding about the drivers of movement and behavior.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据