摘要
长江南京～湖口间４２１ｋｍ长的江段有江豚约６９７头，其中以华阳至湖口一带密度最高．江豚的分布为聚集分布．此外，江豚还具有很强的趋岸性，８８．８％的江豚出现在离岸５００ｍ的范围内．长江江豚的数量近年来有所下降．以本文中的平均密度粗略估计江阴至武汉段长江江豚的种群数量为１４８１头，比张先锋等（１９９３）报道的该江段江豚的数量低１７１头．
About 697 finless porpoise ( Neophocaena phocaenoides ) inhabited the river section from Nanjing to Hukou in the lower reaches of the Yangtze River, with the highest density in river subsection from Huayang to Hukou. The spatial pattern of finless porpoise in the river section from Nanjing to Hukou was assembling distribution.Most porpoises(88.8%)sighted occured within 500m near-bank waters.The population abundance of finless porpoise in the Yangtze River has been declined in the recent years. The population abundance in the river section from Jiangyin to Wuhan was estimated to be 1481, which is about 171 lower than that reported by Zhang et al(1993).
出处
《南京师大学报（自然科学版）》
CAS
CSCD
1998年第2期91-98,共8页
Journal of Nanjing Normal University(Natural Science Edition)
基金
国家渔政渔港管理监督局
鲸豚保护协会资助
关键词
江豚
种群数量
分布特点
长江
finless porpoise,population abundance,distribution characteristics
