摘要
In 2008 and 2009,we made continuous and repeated breeding surveys of the Scaly-sided Merganser(Mergus squamatus)in the Changbai Mountain range(China side),using a combination of rubber-boat drifting and walking.Each survey consisted of a census of breeding pairs in the spring and broods in the summer.A total of 1553 km in length of 17 river stretches were surveyed in four different river systems of the Yalujiang,Songhuajiang,Tumenjiang and Mudanjiang rivers.A total of 1354 individuals of the Scaly-sided Merganser were recorded during the both surveys.The breeding density for all the stretches surveyed over both years averaged 0.26 ± 0.30 pairs per km;the population density in the spring averaged 0.75 ± 0.88 individuals per km.According to our survey results,we estimated that the breeding population in the Changbai Mountain range was about 170 breeding pairs of the Scaly-sided Merganser.Three major breeding sites of this bird were found in the Changbai Mountain range in these surveys.
2008和2009年,我们采取漂流调查和行走调查相结合的方式,对长白山脉(中国境内区域)的中华秋沙鸭(Merguss quamatus)繁殖种群分布状况进行了连续和重复调查。每年的调查都包括春季对中华秋沙鸭繁殖对和夏季繁殖家族的调查。两年期间,共调查了鸭绿江、松花江、图们江、牡丹江4个水系的17个河段,调查距离总计1553km,共记录到中华秋沙鸭个体1354只。全部调查河段的中华秋沙鸭繁殖密度为每公里河段0.26±0.30个中华秋沙鸭繁殖对;春季中华秋沙鸭种群个体密度为平均每公里河段0.75±0.88只中华秋沙鸭个体。根据调查结果,我们初步估计在长白山脉我国境内区域分布的中华秋沙鸭繁殖种群数量大约为170对。在该项调查过程中,我们还探明了在长白山脉3个最主要的中华秋沙鸭繁殖栖息地。
基金
sponsored by the Rufford Small Grant of the Rufford Foundation
