Feeding behavior and food habits of wintering Harlequin Ducks at Shemya Island, Alaska
Feeding behavior and food habits of wintering Harlequin Ducks at Shemya Island, Alaska
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DOI：
10.1676/0043-5643(2000)112
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发表时间：
2000-09-01
期刊：
影响因子：
--
通讯作者：
Griffin, CR
中科院分区：
文献类型：
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作者：
Fischer, JB;Griffin, CR
在冬季活动最集中的阿拉斯加阿留申群岛，人们对越冬小丑鸭的觅食生态知之甚少，缺乏关于该物种基本食物习性的信息。我们从性别、时间和环境变量方面调查了阿拉斯加阿留申群岛西部越冬小丑鸭的摄食行为和食性，以记录它们对冬季条件、资源利用和营养需求的行为反应。我们发现，平均而言，小丑鸭每天的大部分时间都在觅食(70%的雄性，76%的雌性)。然而，更多的时间是在晚上进食。隆冬、寒冷的天气和涨潮。腹足类、甲壳类和双翅目幼虫占食物的83%，但整个冬季的食物组成都发生了变化。尽管饮食习惯发生了变化，但饮食能量密度在整个冬季都保持稳定。
The foraging ecology of wintering Harlequin Ducks (Histrionicus histrionicus) is poorly understood and information on basic food habits is lacking for this species in the Aleutian Islands of Alaska where the largest winter concentrations occur. We investigated feeding behavior and food habits of wintering Harlequin Ducks in the western Aleutian islands of Alaska with respect to sex and temporal and environmental variables to document behavioral responses to winter conditions, resource use, and nutritional requirements. We found that on average, Harlequin Ducks spent most of the diurnal period feeding (70% males, 76% females). However, more time was spent feeding during evenings. midwinter, cold weather, and high tides. Gastropods, crustaceans, and diptera larvae made up 83% of the diet, but diet composition changed throughout winter. Despite change in food habits, diet energy density was stable throughout winter.