Feeding activity of ducks in relation to diel emergence of chironomids
Feeding activity of ducks in relation to diel emergence of chironomids
复制标题
DOI：
10.1139/z82-186
复制
发表时间：
1982-06
影响因子：
1.4
通讯作者：
K. Sjöberg;K. Danell
中科院分区：
文献类型：
--
作者：
K. Sjöberg;K. Danell
1975-1978年期间，研究了瑞典北方湖泊（66°3 'N，23°46' E）上摇蚊（一种作为成鸭和幼鸭重要食物的昆虫类群）的昼夜出现与鸭子的进食活动和行为的关系。摇蚊的出现和群集活动在0800和1200之间达到高峰。即使在刮风的日子也会出现，但在下雨和寒冷的天气期间几乎完全停止。蜂群主要发生在温暖的日子里，风很少或没有风。在这种情况下，在整个湖面上观察到大量的摇蚊。Dabbling鸭喂养整个24小时内，但喂养高峰期恰与摇蚊出现的时期。在这些期间的摇蚊出现的水面上和新兴植被上的摇蚊imagines的表面喂养的戏水和潜水鸭增加。
The diel emergence of chironomids, an insect group important as food item for both adult and young ducks, was studied in relation to the feeding activity and behaviour of ducks on a northern Swedish lake (66°3′ N, 23°46′ E) during 1975–1978. Emergence and swarming activity of chironomids peaked between 0800 and 1200. Emergence occurred even on windy days, but almost completely ceased during periods of rainy and cold weather. Swarming occurred mainly around 1000 on warm days with little or no wind. During such occasions, a large number of chironomids were observed over the entire surface of the lake. Dabbling ducks fed throughout a 24-h period, but peak feeding coincided with periods of chironomid emergence. Surface feeding by both dabbling and diving ducks on chironomid imagines present on the water surface and on emergent vegetation increased during these periods of chironomid emergence.