江苏盐城沿海地区繁殖季节几种水鸟的数量及分布研究Ⅰ

THE POPULATION AND DISTRIBUTION OF SEVERAL WATERBIRD SPECIES AROUND THE COAST OF YANCHENG,JIANGSU PROVINCE IN BREEDING SEASON Ⅰ

1998年 6月 ,江苏盐城沿海地区黑嘴鸥 (Larussaundersi)平均巢密度为 1 0 6只 /hm2 (XD =0 .82 ,n =1 0 ) ,有卵巢密度为 0 71只 /hm2 (XD =0 .71 ,n =1 0 )。巢区上空黑嘴鸥成鸟数量与样带内巢密度及有卵巢数之间有显著相关性 (R =0 .989和 0 978)。虽然黑嘴鸥营群巢繁殖 ,但在集中繁殖区内 ,黑嘴鸥巢向均匀分布方向偏离随机分布 (R =1 .1 0 1 )。根据黑嘴鸥集中繁殖区的面积和有卵巢密度估算集中繁殖区内约有黑嘴鸥繁殖鸟 2 ,5 5

to 1,022 of Saunder's gull( Larus saunderst ) were directly counted at the coast around Yancheng,Jiangsu Province,in June of 1998.Another 920 flying individuals of Saunder's gull over its breeding colony were counted and 212 nests in the colony, of which 148 nests filled with eggs were found.The average nest density was 1.06 nest/hm 2( XD=0.82,n=10 ),and the egg\|filled nest density was 0.71 nest/hm 2 (XD=0.71,n=10). The correlation between the number of flying indivduals of Saunder's Gull over the breeding colony with the nest density and the number of nests with eggs was significant ( R =0.989 and 0.978). The distribution of nests in breeding areas was tending to even distributing and inclining to random distribution ( R=1.101 ),although Saunder's gull had the habit of colonial breeding. Moreover, about 2,550 pairs of Saunder's gull in this breeding area according to the colonial area and the egg\|filled nest density were estimated.