【摘要】 2014年4~6月,采用直接观察法对广汉市南丰镇双庙子村村头的一块人工苗圃内繁殖的4种鹭科鸟类(简称鹭类)(牛背鹭Bubulcus ibis,白鹭Egretta garzetta,池鹭Ardeola bacchus,夜鹭Nycticorax nycticorax)的繁殖集群进行了监测,对鹭类鸟巢的分布密度、种群结构以及鹭类鸟巢的垂直分布和鸟巢大小进行了系统研究与分析。据统计,该苗圃有鹭类鸟巢1 580个,其中牛背鹭类巢(653,41.31%)为最多,高巢位的是夜鹭类巢。树木的高度和林木郁闭度是影响鹭类巢址选择的主要因素,而林地面积对鹭类巢址的选择影响不明显。影响鹭类巢穴大小的主要因素是鹭类本身体型、树木高度和在巢穴中的居住时间,但鸟巢中新增的幼鸟数量对巢穴大小无影响。更多还原

【Abstract】 We investigated a breeding colony comprised of four species of the family Ardeidea( cattle egret Bubulcus ibis,little egret Egretta garzetta,Chinese pond heron Ardeola bacchus,and night heron Nycticorax nyrticorax) by direct observation from March to June 2014 in Shuangmiaozi village, Nanfeng township, Guanghan City, China. We calculated nest density, population structure,vertical distribution and size of nest. We recorded 1 580 nests,including cattle egret nests( 653,41%). The vertical distributions showed night herons nests in the forest canopy.The height of trees and canopy density were the main factors influencing nest-site selection,but forest area was not a major factor influencing colony selection. Nest size was affected by the body size of spieces,the height of trees,and residence time,but not by number of nestlings.更多还原