厦门大屿岛三种鹭的种群动态和营巢

对厦门大屿岛白鹭保护区的夜鹭（Nycticorax nycticorax）、白鹭（Eegrtta garzetta）和池鹭（Ardeola bacchus）进行种群动态和营巢观察研究。3种鸟的数量季节变化都很大，5～7月数量高峰期，每月总数都达5000只左右。5月底共5610只，3种鸟的比例分别为50.8%、32.0%和17.2%。4月开始大量在相思树梢上营巢，5月中至6月初巢数多达6000多个。结果表明，3种鸟都是厦门的繁殖鸟和留鸟。

Population dynamics and nesting of three species of egret on Xiamen Dayu Island

This paper deals with the population dynamics and nesting of Nycticorax nycticorax, Egretta garzetta and Ardeola bacchus in the Egret Naturel Reserve on Xiamen Dayu Island. The number of three egret species vary greatly with the season. May, June and July is the peak seasons. When the total birds reach about 5000 in each month. Especially, 5610 birds are sighted in May,and three species account for 50.8%, 32.0% and 17.2%, respectively. In April, most egrets begin to nest on the branchs of Acacia confusa, and nests come to 6000 during middle May and the beginning of June.The results show that the three species of egret are all resident and breeding birds of the Island.