长山列岛发现黄嘴白鹭的繁殖种群

A Breeding Population of the Chinese Egret on the Changshan Islands

:1 999年 6～ 8月 ,在辽宁省长海县石城乡形人岛 (N30°31′,E1 2 3°0 2′)发现了目前已知国内最大的黄嘴白鹭繁殖种群 ,约 4 0 0余只。黄嘴白鹭于 4月份迁至该岛繁殖 ,巢材由蒿子杆构成 ,每窝产 4～ 6枚卵 ,卵为淡青色。 1 4枚卵平均大小为 4 8 5( 46 0～ 50 5)mm× 34 0 ( 31 0～ 36 5)mm ,平均重量为 2 8 3( 2 7 5～ 2 9 0 ) g。孵化期 2 1～ 2

During a wildlife survey along coastal islands from June to August of 1999 in Changhai County of Liaoning Province, as large as 400 individuals of breeding population of the Chinese Egret have been found in Xingren island (N39°31′,E123°02′). They fly to the island for breeding from April. Nest sites were found in branches of the small tree, in grass or bushes of the upper part of the island. Nests are simple built with small branches of wormwood. There are 4～5 eggs in one clutch. 14 eggs average 48\^5(46\^0～50\^0)mm×34\^0(31\^0～36\^5)mm in size, and average 28\^3(27\^5～29\^0)g in weight. Hatching period is about 21～23 days.