【摘要】 20 0 0年 3月～ 6月对无锡鼋头渚的鹭鸟繁殖期的种群生态特征进行了调查研究 ,结果表明 :栖息地共有鹭巢 3 64 0 0个 ,巢密度为 0 5 2个 /m2 ,平均每棵树有巢 3 3 6个 ;较早迁来的夜鹭首先占据了远离村庄及公路的相对较好的位置 ;鹭类筑巢对高大的马尾松利用率较高 ,且个体较大的鹭鸟多占据树的中上部 ,个体较小的鹭鸟则主要栖息于下部 ;夜鹭和牛背鹭平均窝卵数为 3个 /巢 ,白鹭和池鹭为 5个 /巢。更多还原

【Abstract】 Characteristics of Four Herons living in Yuant ouzhu of Wuxi in the Taihu Lake region were studied in 2000.Results showed that there were 36 400 nests of Four Herons in Yuantouzhu,averaging about 0.52 nest/m 2,and 3.36 nests per tree in the habitat.Earlier settlers often built their ne sts in relatively better locations,far away from villages and highways.Tall tree s,especially Pinus massoniana,were their favorite nesting ground,often with larger birds on top or in the middle of the canopy and the smaller in the lower part.The average size of a clutch was 3 for Nycticorax nycticorax and Bubu lcus ibis,and 5 for Egretta garzetta and Ardeola bacchus更多还原