西藏林芝市西藏蟾蜍种群的年龄、生长及其他种群特征的研究

Age,Growth and Other Population Characteristics of Bufo tibetanus in Nyingchi City,Tibet

为了深入了解西藏蟾蜍Bufo tibetanus的种群特征,积累更多的生物学资料,本研究利用骨龄学方法、辅以生殖腺形态及其组织学结构的观察,对地处高海拔西藏自治区林芝市的一个西藏蟾蜍(♀29只,♂34只)种群的年龄结构、体长、生殖腺的形态和性成熟年龄等进行了分析。结果表明:西藏蟾蜍第三指骨切片中均可清晰观察到生长抑制线;两性个体体长与年龄均呈极显著正相关(P<0.01);各年龄组中两性个体体长无显著性差异,两性的平均年龄无显著差异(P>0.05);两性个体的性成熟年龄一致,均为4龄;雌性的最长寿命为9龄,雄性为8龄。由此可见,该西藏蟾蜍种群在被采集的2014—2015年的年龄结构属于增长型,具有健康发展的潜能。

In order to understand the population characteristics of Bufo tibetanus and accumulate more biological data of this species.The age structure,body length,morphology of male and female gonads and age of sexual maturity of 63 B.tibetanus individuals(♀29,♂34),a population located at high altitude of Nyingchi City(Tibet Autonomous Region),were analyzed by observing the gonadal morphology and histological structure.The lines of arrested growth could be clearly observed in the 3rd phalanx sections.A positive relationship between body length and age were found in both sexes(P<0.01).The differences of body length and average age between sexes were not significant(P>0.05).In addition,the sexual maturity age of both sexes is the same(4 years old).The maximum life span of females is 9 years,while that of the males is 8 years.It can be concluded that the age structure of this B.tibetanus population from 2014 to 2015 belongs to growth type and this population has the potential of healthy development.