绿鹭的繁殖习性观察

2001年4－9月在合肥市对绿鹭（Butorides striatus)的繁殖习性进行了观察。绿鹭营巢生境主要选择在建筑物附近的高大阔叶树上，常一树一巢，未见与其他鹭类混群营巢。每巢产3－5枚卵，孵卵期21d，育雏期41d，42日龄后幼鸟离巢飞走，出飞存活率62．5％。育雏期雏鸟主要食物为小型鱼类。在4所大学校园及1处公园统计到有效巢56个，推算绿鹭224只。绿鹭在合肥繁殖属首次记录。

Observations on the Breeding Habits of Green-backed Herons(Butorides striatus)

Observations and investigations on the breeding habits of the Green backed Herons( Butorides striatus ) were carried out from April to September in 2001 in Hefei.Most nest sites were selected in tall broadleaf trees near buildings.In most cases,a single nest was located in one tree,without neighboring with other herons.Normally a nest had 3-5 eggs,and the incubation period was 21 days. After being fledged for 41 days,the young birds flight off the nest on the 42nd day and the rate of survival upon flying away was 62 5%.The young birds fed small fish.Fifty six effective nests were found in 4 campuses and a park,and therefore the total 224 individuals were estimated.The Green backed Herons in Hefei is the first breeding record.