海南3种鹭越冬行为的比较

Comparative Studies on Wintering Behavior of Three Egrets

于2004年1～2月选择了3种鹭类作为研究对象,采用瞬时扫描观察的方法,就其越冬行为差异进行了比较。3种鹭昼间主要行为有所不同,苍鹭(Ardea cinerea)主要以站立和休息为主,白鹭(Egretta garzetta)主要以取食和休息为主,而大白鹭(E.alba)主要以站立和取食为主。本文对3种鹭的取食行为进行了比较分析,3种鹭的取食行为比例从高到低依次为白鹭(40%～60%)、大白鹭(20%～40%)和苍鹭(0.1%以下)。最后,对3种鹭不同的取食对策进行了讨论。

Behaviors of three egrets were observed by using instantaneous scanning sampling method from January to March of 2004 at Beili Bay of Dongfang City, Hainan Island. In daytime Grey Heron always rest and stand on the mudflats,and seldom feeding. Little Egret prefer to feeding than standing, and Great Egret often stand, sometime feeding. The frequency of feeding for the three Egret is 40 % - 60 % for Little Egret, 20 % - 40 % for Great Egret, and less than 0.1% for Grey Heron. The difference of feeding strategy of the three egrets was discussed in this paper.