Abstract: 　 A study was conducted on the static life table, reproduction, and population dynamics off in less porpoise (Neophocaena phocaenoides) from the Yangtze River population, Yellow Sea population, and South China Sea population. Static life tables of three populations were constructed, which gave rise to“L ”-shape survivorship curves. Death curve and death rate curve, showing some fluctuations, were different among populations. The sex ratios of all three populations were not different with 1:1 significantly.The R₀ and λ of all three populations were less than 1, w hereas the r_m of them were less than 0, indicating that the population numbers of three populations will decrease in the future. It is necessary to enhance the conservation of f in less porpoise populations.

Key words: Finless porpoise, Population, Static life table, Intrinsic rate of increase, Population dynamics

摘要： 根据江豚长江种群、黄海种群和南海种群的年龄鉴定数据, 编制了3 个种群的静态生命表, 绘制了各种群的存活曲线、死亡曲线和死亡率曲线, 计算了各种群的内禀增长能力。3个
种群的存活曲线均为C 型(Odum ,1983) , 但南海种群和黄海种群的陡度更大。各种群的0～2 龄, 以及黄海江豚和南海江豚的2～4 龄是死亡高峰期。死亡率曲线在各种群中呈现一定的波动。各种群的性比与1∶1没有显著性差异。3个种群的R₀ 和K均小于1, r_m 均小于0, 表明它们的数量有减少的趋势, 需加强对它们的保护。

关键词: 江豚, 种群静态生命表, 内禀增长率, 种群动态