Harbour porpoise (Phocoena phocoena) foraging strategy at a high energy, near-shore site in south-west Wales, UK
Harbour porpoise (Phocoena phocoena) foraging strategy at a high energy, near-shore site in south-west Wales, UK
复制标题
英国威尔士西南部高能量近岸地点的港湾鼠海豚 (Phocoena phocoena) 觅食策略
DOI：
10.1017/s0025315408000507
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发表时间：
2008
影响因子：
1.2
通讯作者：
C. Pierpoint
中科院分区：
文献类型：
--
作者：
C. Pierpoint
港鼠海豚（Phocoena Phocoena）在特定的潮汐状态下到拉姆齐海峡觅食。首选的觅食地点是南拉姆齐湾的高能量栖息地，在退潮阶段形成潮汐竞赛，溢出和上升流区。海底地形和潮流结合在一起，形成了港湾海豚定期和可预测的觅食资源。观察到鼠海豚多次浮上水面，直接进入海床上陡峭的海沟上方和附近的潮汐流。潮汐流和陡峭的海沟壁被认为集中了猎物，这些猎物被聚集到等待的海豚那里。有幼崽的鱼群更喜欢水流最快的周边地区，那里的水流速度较低。港鼠海豚的存在几乎完全局限于退潮阶段，但在整个退潮阶段，海豚经常占据这个地方。港鼠海豚在潮汐竞合生境中觅食的研究在其地理分布范围内得到了广泛的报道，并提出了有关在高能量环境中觅食策略和捕食猎物的净能量价值的问题。
Harbour porpoises (Phocoena phocoena) visit Ramsey Sound at specific states of tide to feed. The preferred foraging location is high-energy habitat in South Ramsey Sound where a tide race, overfalls and upwelling zones form during the ebb phase. Seabed topography and tidal currents combine to create a foraging resource exploited by harbour porpoises at regular and predictable intervals. Porpoises are observed surfacing repeatedly directly into the tidal stream above and adjacent to, a steep-sided trench on the seabed. Tidal currents and the steep walls of the trench are believed to concentrate prey which is funnelled towards the waiting porpoises. Schools with calves prefer areas on the periphery of the fastest flowing water, where current speeds are lower. The presence of harbour porpoises is restricted almost entirely to the ebb tidal phase, but porpoises regularly occupy this site for the entire ebb phase. Harbour porpoise foraging in a tide race habitat is widely reported from the geographical range of the harbour porpoise and raises issues regarding foraging strategy and the net energetic value of hunting prey in high-energy environments.