贵州中部的鹭鸟群巢(英文)

Ardeid nesting colonies in central Guizhou,southwestern China

2006年5月,对贵州中部的鹭鸟群巢进行了调查,共记录到11个繁殖群、1587巢,种类包括小白鹭(Egretta garzetta)、牛背鹭(Bubulcus ibis)、池鹭(Ardeola bacchus)、夜鹭(Nycticorax nycticorax)和苍鹭(Ardea cinerea)。最大的繁殖群在黄平风云崖和赤水宴府。种类以小白鹭为优势种,其巢数量占总巢数的49.7%;而苍鹭最少,仅占0.1%。所有鹭鸟巢均只发现于贵州中、北部,而南部的雷公山地区没有调查到。鹭鸟群巢在贵州中部的分布明显受到农田种植模式(冬天种植小麦和油菜,夏天种植水稻)的影响,繁殖巢主要分布于稻作区。但在贵州南部的主要稻作区却没有发现鹭鸟繁殖群巢,其原因尚待调查。对贵州黄平和赤水这两个较大鹭鸟群巢所在地需重点加以保护。

A survey of Ardeid nesting colonies in central Guizhou,southwestern China in May 2006,which covered about one-third of the area of this province,recorded a total of 1587 nests of five species,i.e.,Little Egret (Egretta garzetta),Cattle Egret (Bubulcus ibis),Chinese Pond Heron (Ardeola bacchus),Black-crowned Night Heron (Nycticorax nycticorax) and Grey Heron (Ardea cinerea) at 11 nesting colonies.The largest colonies were recorded at Fengyunyan and Yanfu resorts,the smallest one at Luobolin.The Little Egret was the dominant nesting species (49.7% of the total number of nests) and the Grey Heron was the least abundant (0.1%).All nesting colonies were located in the northern and central parts of Guizhou;no colonies were found in the Leigongshan area,the southern part of this province.The distribution of nesting colonies in central Guizhou appears to be affected by the relative composition of winter (wheat and vegetable) and summer (rice) crops during the breeding season (between late March and June).No colonies were found around farmlands with winter crops and most colonies were situated around rice paddies.The farmland use pattern is affected by rainfall.The summer crop is delayed if the rainy season starts late and the rainfall is light.Priority for conservation of the Ardeids in central Guizhou should be given to the larger colonies i.e.,Yanfu and Fengyunyan resorts.