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首页> 外文期刊>Journal of Zoology >Foraging behaviour and diet of lactating female southern sea lions (Otaria flavescens) in the Falkland Islands
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Foraging behaviour and diet of lactating female southern sea lions (Otaria flavescens) in the Falkland Islands

机译：在福克兰群岛觅食的雌性南部海狮（Otaria flavescens）的觅食行为和饮食

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This study investigated the foraging behaviour, diving behaviour, movements and diet of lactating southern sea lions in the Falkland Islands. They appeared to be primarily nocturnal, benthic foragers hunting at depths ranging from the surf line down to 250 m, and from just off their breeding sites out to 45 km offshore. Occasional longer trips may extend foraging ranges to over 150 km from breeding sites. Attendance patterns suggest that Falklands' sea lions do not haulout simply to feed their pups. Other factors such as predation and thermoregulation may cause them to come ashore. When at sea they travelled at approximately 1 m s~(-1), slower than previous studies of otariids indicated. Absence from the breeding site did not imply continuous foraging; all study animals used remote haulout sites away from their pups. Repeated use of the same areas and the short duration of foraging trips suggest that they were able to catch enough food within a fairly small foraging range. Data on diet support the suggestion that lactating sea lions are mainly benthic foragers. They take a wide range of prey species. The most common cephalopods were Loligo gahi, similar in size to those taken by the fishery. There is therefore potential for competition between the sea lion population and the Loligo trawl fishery. There was considerable overlap between the diet of sea lions and those of Gentoo and Magellanic penguins, which suggests that sea lions may compete with both species.
机译：这项研究调查了福克兰群岛南部哺乳的海狮的觅食行为，潜水行为，运动和饮食。他们似乎主要是夜行的底栖觅食者，其冲浪深度从冲浪线下降到250 m，从繁殖地点离开一直到近海45 km。偶尔更长的行程可能会将觅食范围扩大到距繁殖地点150多公里。出勤方式表明，福克兰群岛的海狮不仅仅为了喂养幼仔而拖拉。捕食和温度调节等其他因素也可能导致它们上岸。它们在海上航行的速度约为1 m s〜（-1），比以前对耳虫的研究要慢。繁殖地点的缺席并不意味着持续觅食。所有被研究的动物都远离幼犬使用偏远的养殖场。重复使用相同的区域以及觅食旅行的持续时间短，表明他们能够在相当小的觅食范围内捕获足够的食物。关于饮食的数据支持了这样的建议，即哺乳期的海狮主要是底栖觅食者。他们接受各种各样的猎物。最常见的头足类是Loligo gahi，其大小与渔业捕捞的相似。因此，海狮种群和Loligo拖网渔业之间存在竞争的潜力。海狮的饮食与Gentoo和麦哲伦企鹅的饮食之间存在相当大的重叠，这表明海狮可能与这两种物种竞争。

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