湖南花岩溪白鹭繁殖习性研究

Breeding Characteristics of Egretta garzetta in Huayanxi,Hunan Province

2007年3～8月对湖南常德花岩溪地区白鹭的迁入状况、繁殖行为、雏鸟生长等情况进行了定点调查研究。结果表明：白鹭于每年3月上旬迁入花岩溪地区，进行营巢繁殖活动，于8月离开该地，在营巢地居留约5个月，与夜鹭、牛背鹭、苍鹭共同形成混合集群。由于当地居民砍伐林木的原因，白鹭的数量相比往年有所减少。白鹭属于单配制，其窝卵数为3—6枚，每窝出雏数为2—6只，孵化率为（87．23±7．46）％，雏鸟20日龄成活率为（82．93±10．50）％，有极少数量的雏鸟受刮风下雨等恶劣天气的影响，从窝中跌落树下而损失。

The breeding ecology of Egretta garzetta, such as ingression time, breeding behavior and nestling growth were observed and studied from March to May 2007 in Huayanxi, Changde City, Hunan Province. The results indicated that the Egretta garzetta moved＇into the region to nesting and breeding in March and moved out of the place in August, and stayed in the nest for about five months. Ardeola bacchus, Bubulcus ibis, Egretta garzetta and Ardea cinerea were mixed together to form clusters. Compared to the previous years, the number of Egretta garzetta had decreased due to the deforesting by local residents. The Egretta garzetta was monogamy. Its clutch size was 3 - 6, brood size was 2 - 6, and the hatching rate was （ 87.23 ± 7.46） % and the survival rate of nestlings on the 20^th day was （ 82.93 ± 10.50） %. A very small number of nestlings which fell from branch were loss due to the bad weather.