Diving performance of male and female Japanese Cormorants
Diving performance of male and female Japanese Cormorants
复制标题
雄性和雌性日本鸬鹚的潜水表演
DOI：
10.1139/z96-122
复制
发表时间：
1996
影响因子：
1.4
通讯作者：
Y. Naito
中科院分区：
文献类型：
--
作者：
Y. Watanuki;A. Kato;Y. Naito
在北海道的Teuri岛，使用了典型的潜水循环，在北海道的Teuri Island中研究了性二态二态性cap的潜水行为差异（男性比女性重26％）。它们保持一段时间的底相，上升期和后表面相位的深度和持续时间。女性（分别为7.2±2.4 m，24±4 s）。性别不同。 Div ...
Sexual differences in the diving behavior of the sexually dimorphic Japanese Cormorant, Phalacrocorax capillatus (males are 26% heavier than females), were studied at Teuri Island, Hokkaido, using time–depth recorders. A typical dive cycle involved a rapid descent phase, a bottom phase where they remained for a while, an ascent phase, and a postdive surface phase. Depth and duration across individual birds were greater for males (15.1 ± 3.7 (mean ± SD) m, 37 ± 5 s, respectively) than those for females (7.2 ± 2.4 m, 24 ± 4 s, respectively). While submerged, females spent a similar proportion of time during the bottom phase to males, hence foraging efficiency (proportion of time at the bottom to total dive cycle time) did not differ between the sexes. No sexual differences were found in descent and ascent rates, dive bout duration, or time spent underwater per day. No significant effects of dive duration on postdive surface time were observed for either sex, indicating that birds dived within an aerobic div...