太湖鼋头渚地区鹭类觅食生境研究

连续 2a实地调查了太湖鼋头渚地区鹭鸟的觅食生境 ,并搜集其雏鸟的反吐物 ,初步掌握了该地区不同鹭鸟对觅食生境的选择与食物组成情况。结果表明 ,无锡鼋头渚地区白鹭与夜鹭主要在鱼塘、湖泊觅食 ,白鹭在湖滨觅食 ,而夜鹭还会到湖中央水面觅食 ;池鹭觅食区域较广 ,主要在鱼塘。鹭群主要的食物类型是鱼类 ,白鹭食物几乎全为鱼类 ,夜鹭 95 %的食物为鱼类 ,兼有少量的蛙类、甲壳类和小型哺乳类动物。

Feeding Habitats of Egrets and Herons at Yuantouzhu Area of Taihu Lake

Egrets and herons are important components of the wetland ecosystem in the Taihu Lake.Investigations were conducted of their feeding habitats and preys in 1999 and 2000,revealing how egrets and herons of different species selected their feeding habitats,what they preyed on,and how the pollution of the local environment affected egrets and herons.It was discovered that little egrets and night herons sought for prey in fish ponds and lakes at Yuantouzhu area in Wuxi.On lakes,little egrets usually preyed on shores while night herons would also seek prey over the water in the center of the lake.Chinese pond herons had a wider range of feeding habitat,but fish ponds were their major feeding area.The egrets and herons fed mainly on fish,which accounted for 100% of the diet of little egret chicks,and for 95% of the diet of night heron chicks.Night heron chicks also received small amounts of frogs,crustaceans and small sized mammals.