Partitioning of foraging effort in Adelie penguins provisioning chicks at Bechervaise Island, Antarctica
Partitioning of foraging effort in Adelie penguins provisioning chicks at Bechervaise Island, Antarctica
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DOI：
10.1007/s003000000168
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发表时间：
2001-01-01
期刊：
影响因子：
1.7
通讯作者：
Clarke, JR
中科院分区：
文献类型：
--
作者：
Clarke, JR
对阿德利企鹅（Pygoscelis adeliae）在育雏期间进行长时间和短时间（分别为>和< 40 h）觅食旅行时的体重分析表明，长途旅行前鸟类的出发重量明显轻于短途旅行前。企鹅，特别是男性，在警卫阶段开始时比结束时显着更重，两性在托儿所期间获得了相似的体重。结果支持这一假设，即觅食努力的阿德利企鹅在Bechervaise岛之间的性别，男性接受净率的负能量增益，以提供定期的膳食为他们的后代在警卫阶段。阿德利企鹅觅食行为可能是由分配给幼鸟的食物和父母身体储备的储存之间的权衡所驱动的，类似于以前假设的一些飞行海鸟物种。这种觅食策略的相关性，在南极洲东部的莫森地区的企鹅繁殖成功进行了讨论，在该地区的micronekton分布。
Analyses of the body masses of Adelie penguins (Pygoscelis adeliae) departing on foraging trips of long and short duration (> and < 40 h, respectively) during chick rearing showed that the departure weights of birds prior to long trips were significantly lighter than were those prior to short trips. Penguins, particularly males, were significantly heavier at the start of the guard stage than at the end and both sexes gained similar amounts of body mass during the creche period. Results support the hypothesis that the foraging effort of Adelie penguins at Bechervaise Island is partitioned between the sexes, with males accepting a net rate of negative energy gain to provide regular meals for their offspring during the guard stage. Adelie penguin foraging behaviour may be driven by a trade-off between the allocation of food to chicks and the storage of parental body reserves, similar to that previously postulated for some species of flying seabirds. The relevance of such a foraging strategy to the breeding success of penguins in the Mawson region of eastern Antarctica is discussed in relation to micronekton distribution in the area.