【摘要】 对湖口至南京段长江江豚的考察资料进行分析 ,结果表明 :1 研究长江江豚不同的生态行为 ,能提高野外计数的准确性 ;2 长江江豚大规模集群 ( 1 0头以上 )发生在特定的江段 ,近年来出现的机率在下降 ;3 湖口至南京段长江江豚数量为 1 0 54头 ,其中小孤山至湖口段种群密度最高 ;4 湖口至南京段支流中分布的长江江豚约占该江段种群数量的9 3%。更多还原

【Abstract】 Analysed on the dates about Yangtze finless porpoise( Neophocaena phocaenoides asiaeorientalis )observed from the section of Hukou-Nanjing,it is showed: 1 Studying on various ecological behavior of Yangt鬩 ze finless porpoise ,prent of the animal in field can be improved;2 Recently a large concentration of the animal (over 10 individuals) is obvious decrease which appears in a special section of theYangtze River;3 Estimated individuals of Yangtze finless porpoise in the section of Hukou to Nanjing is 1 054,and there is maximum population density in the section of Xiaogushan to Hukou;4 Individuals of Yangtze finless porpoise in the branch is 9 3% of total population in the section of Nanjing to Hukou更多还原