Pop-off satellite archival tags (PSATs) have been increasingly deployed on marine megafauna to remotely monitor their movements, behavior, and environmental preferences. These tags have also allowed the occasional novel documentation of ecological interactions, such as predation on tagged animals. A PSAT deployed on a pregnant porbeagle Lamna nasus in the Northwest Atlantic suggests the shark was predated upon in mesopelagic waters near Bermuda. Predation was evident approximately 5 months after tagging based on depth and temperature data transmitted by the PSAT. Four days prior to PSAT pop-off, depth data indicated that the tag continued to descend and ascend in the water column while the temperature remained approximately 5°C above ambient levels, even at several hundred meters in depth, indicating ingestion. Given the location of predation and elevated temperature at depth recorded by the pregnant porbeagle’s tag, potential predators include endothermic shark species such as the white shark Carcharodon carcharias and shortfin mako Isurus oxyrhinchus. This is the first evidence of predation on a porbeagle globally and provides novel insight into inter-specific interactions for this large, threatened shark species.

中文翻译：

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西北大西洋首次发现配备弹出式卫星档案标签的成年鼠鲨被捕食的证据


弹出式卫星档案标签（PSAT）越来越多地部署在海洋巨型动物身上，以远程监控它们的运动、行为和环境偏好。这些标签还允许偶尔对生态相互作用进行新颖的记录，例如对标记动物的捕食。在西北大西洋一只怀孕的鼠鲨身上部署的 PSAT 表明，这只鲨鱼是在百慕大附近的中层水域被捕食的。根据 PSAT 传输的深度和温度数据，在标记后大约 5 个月，捕食现象就很明显。 PSAT 弹出前四天，深度数据表明标签在水柱中继续下降和上升，而温度仍比环境水平高出约 5°C，即使在数百米的深度，这表明标签被摄入。考虑到怀孕鼠鲨标签记录的捕食地点和深处升高的温度，潜在的捕食者包括吸热鲨鱼物种，如白鲨和短鳍灰鲭鲨。这是全球范围内鼠鲨被捕食的第一个证据，并为这种大型受威胁鲨鱼物种的种间相互作用提供了新的见解。