摘要
20 0 3年 3～ 4月对西沙群岛的鸟类资源进行了考察 ,在西沙群岛的东岛发现小军舰鸟 (Fregatami nor)繁殖 ,为迄今所知该种在我国仅有的繁殖记录。野外观察共发现 7个巢 ,其中 5个巢中途毁损 ,另见幼鸟13只 ,非繁殖雄性个体 2只。还观察到小军舰鸟与红脚鲣鸟相互影响的负面行为 ,如抢食、窃巢材等。调查结果显示 ,西沙群岛小军舰鸟分布范围现已缩小 ,而且种群数量显著下降。
A survey on bird resources of Xisha archipelago was carried out in March-April of 2003,and one breeding colony of Great Frigatebirds (Fregata minor) was found on Dong (East) island of Xisha archipelago,which is the first breeding record of this bird so far reported in China.Seven nests,13 juveniles and 2 non-breeders (adult male) were found in the wild.Among 7 nests,5 nests were damaged during the nesting period.Also some behaviors with negative effect were observed between Great Frigatebird and Red-footed Booby (Sula sula) such as robbing of food and stealing nest material.Our investigations showed that the population size and the distribution area of the Great Frigatebird had been decreased remarkably.
基金
国家自然科学基金重点资助项目 ( 4 0 2 3 10 0 2 )
中国科学技术大学青年科学基金 (KB0 82 5 )
关键词
小军舰鸟
种群数量
繁殖
西沙群岛东岛
Fregata minor
Population size
Breeding
Dong Island of Xisha archipelago
