紫蓬山区三种鹭雏鸟的食物多样性比较

池鹭(Ａｒｄｅｏｌａｂａｃｃｈｕｓ)、白鹭(Ｅｇｒｅｔｔａｇａｒｚｅｔｔａ)和夜鹭(Ｎｙｃｔｉｃｏｒａｘｎｙｃｔｉｃｏｒａｘ)4～7月在紫蓬山区国家级森林公园集群繁殖7]。有关三者的繁殖生态报道较多6,10～12,23],但甚少较系统的研究雏鸟的食性,尚缺乏通过食性研究进行鹭类资源管理和生物多样性保护方面的探讨。笔者1996年4～7月在紫蓬山区国家级森林公园的圆通山对池鹭、白鹭和夜鹭雏鸟的食性进行了观察,整理报道如下。1　工作方法收集称量雏鸟吐出的食物13],或逆向挤压嗉囊使其吐出食物,统计食物的种类、数量。食物量百分比、食物…

Food Diversity of Three Species of Nestling Herons in Zipeng Mountains

The food habits of three nestling herons in Zipeng Mountains, Feixi County, Anhui Province from April to July in 1996 were reported in the paper. Based on food habits, food diversity and similarity were compared. The nestlings of Chinese pond heron were fed with fish and insects, those of little egret were given with fish and shrimps, however, those of black-crowned night heron were brought up with fish and amphibians. Of the diets of the three species, nestling Chinese posnd heron had the widest one, nestling black-crowned night heron had the narrowest one. Nestling Chinese pond heron had the highest preference to insects, but nestling little egret and nestling black-crowned night heron had the highest preference to fish. Similarity of food between nestling little egret and nestling black-crowned night heron was the highest, but was the lowest between Chinese pond heron and black-crowned night heron. Study on the food habits was important for us to manage herons and preserve biodiversity.