Intersexual differences in the diving behaviour of foraging subantarctic cormorant (Phalacrocorax albiventer) and Japanese cormorant (P-filamentosus)
Intersexual differences in the diving behaviour of foraging subantarctic cormorant (Phalacrocorax albiventer) and Japanese cormorant (P-filamentosus)
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DOI：
10.1016/s0764-4469(00)88525-x
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发表时间：
1999-07-01
期刊：
影响因子：
--
通讯作者：
Naito, Y
中科院分区：
文献类型：
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作者：
Kato, A;Watanuki, Y;Naito, Y
鸬鹚通过脚推动的潜水觅食，鸬鹚如何优化觅食是一个特别有趣的关系到对潜水鸟类觅食策略的理解，以及关于鸬鹚对可持续资源的影响的争论。利用微数据记录仪记录潜水深度，研究了生活在寒冷地区的亚南极鸬鹚和生活在北温带的日本鸬鹚的雄性和雌性觅食策略。对于这两个物种来说，雄性和雌性每天在水下花费的时间相同，显然捕获的鱼数量相同。然而，雄性潜得更深，时间更长，这可以解释为它们的体重比雌性大15- 20%，这可能会减少潜在的食物竞争。(C)巴黎科学院/爱思唯尔。
Cormorants feed by feet-propelled diving, How cormorants optimize foraging is of a particular interest in relation to the understanding of the feeding strategies of diving birds, as well as within the debate about cormorants' impact on sustainable resources. Using microdata loggers that recorded diving depth, we investigated the foraging strategy of males and females of subantarctic cormorants, which inhabit cold regions, and of Japanese cormorants, which live in the northern temperate zone. For both species, males and females daily spent the same amount of time submerged, and apparently captured the same amount of fish. However, males dived deeper and longer, which could be explained by their 15-20 % larger body mass and may minimize potential competition for food. (C) Academie des Sciences / Elsevier, Paris.