Sex-specific foraging behaviour in a monomorphic seabird
Sex-specific foraging behaviour in a monomorphic seabird
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DOI：
10.1098/rspb.2002.2083
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发表时间：
2002-08-22
影响因子：
4.7
通讯作者：
Hamer, KC
中科院分区：
文献类型：
--
作者：
Lewis, S;Benvenuti, S;Hamer, KC
父母觅食行为的性别差异已被观察到在一些性别大小二型鸟类，特别是海鸟，通常的推论是，这些性别特异性差异主要是由身体大小的差异介导的。为了验证这一解释，我们比较了觅食行为的父母在一个单态海鸟物种，北方塘鹅桑。使用专门设计的仪器和无线电遥测技术，我们发现，两性个体在觅食旅行的方向和持续时间上是一致的。然而，有显着差异的觅食行为的男性和女性。雌塘鹅不仅在觅食的区域比雄塘鹅更有选择性，而且它们潜水的时间更长、更深，在海面上停留的时间也比雄塘鹅长。由于该物种的性别在形态上相似，因此这些差异不太可能由身体大小介导。我们的工作突出了需要调查海鸟和其他物种觅食行为的性别差异更密切，以测试替代理论，不依赖于身体大小的差异。
Sexual differences in the foraging behaviour of parents have been observed in a number of sexually size-dimorphic birds, particularly seabirds, and the usual inference has been that these sex-specific differences are mediated primarily by differences in body size. To test this explanation, we compared the foraging behaviour of parents in a monomorphic seabird species, the northern gannet Morus bassanus. Using specially designed instruments and radio telemetry we found that individuals of both sexes were consistent in the directions and durations of their foraging trips. However, there were significant differences in the foraging behaviour of males and females. Female gannets were not only more selective than males in the areas where they foraged, but they also made longer, deeper dives and spent more time on the sea surface than males. As the sexes are morphologically similar in this species, then these differences are unlikely to have been mediated by body size. Our work highlights the need to investigate sexual differences in the foraging behaviour of seabirds and other species more closely, in order to test alternative theories that do not rely on differences in body size.