| 南京～湖口段长江江豚的种群数量和分布特点 |
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| 引用本文： | 周开亚 杨光. 南京～湖口段长江江豚的种群数量和分布特点[J]. 南京师大学报(自然科学版), 1998, 21(2): 91-98 |
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| 作者姓名： | 周开亚 杨光 |
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| 作者单位： | 南京师范大学生物系 |
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| 基金项目： | 国家渔政渔港管理监督局,鲸豚保护协会资助 |
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| 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．
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| 关 键 词： | 江豚，种群数量，分布特点 |
Population Abundance and Distribution Characteristics of Finless Porpoise in the River Section from Nanjing to Hukou of the Yangtze River |
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| Zhou kaiya,Yang Guang,Gao Anli,Sunjiang,Xu Xinrong. Population Abundance and Distribution Characteristics of Finless Porpoise in the River Section from Nanjing to Hukou of the Yangtze River[J]. Journal of Nanjing Normal University(Natural Science Edition), 1998, 21(2): 91-98 |
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| Authors: | Zhou kaiya Yang Guang Gao Anli Sunjiang Xu Xinrong |
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| Affiliation: | Zhou kaiya,Yang Guang,Gao Anli,Sunjiang,Xu Xinrong Department of Bidogy,Nanjing Normal University,Nanjing 210097,PRC. |
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| Abstract: | 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). |
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| Keywords: | finless porpoise population abundance distribution characteristics |
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