铅色水蛇繁殖生活史特征的年间变异  

Annual Variation in Reproductive Life-history Traits in Hypsiscopus plumbea

作　　者：欧俊伟 韩璐旖 黄鸿雅 张清莲 平骏 张永普[1] OU Jun-Wei;HAN Lu-Yi;HUANG Hong-Ya;ZHANG Qing-Lian;PING Jun;ZHANG Yong-Pu(College of Life and Environmental Sciences,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]温州大学生命与环境科学学院,温州325035

出　　处：《动物学杂志》2021年第4期535-542,共8页Chinese Journal of Zoology

基　　金：国家自然科学基金项目(No.31971419);国家级大学生创新创业训练计划项目(No.202010351032)。

摘　　要：爬行动物繁殖生活史特征是动物进化生物学研究领域的重要内容,而国内有关卵胎生蛇类繁殖生活史特征的研究目前较为匮乏。本研究以我国南方地区常见的卵胎生蛇类——铅色水蛇(Hypsiscopus plumbea)为研究对象,在2013至2015年每年7月于温州地区捕获怀孕中后期水蛇母体,带回实验室,收集所产幼体,测量母体产后形态以及初生幼体形态指标。结果发现,母体产后头体长和体重存在明显年间变异,高温干旱年份(2015年)的母体产后身体状况较差;母体总的繁殖输出(窝仔数、窝仔重)均与母体头体长呈显著正相关,但无显著的年间变异;初生幼体头体长、体重与母体头体长均无相关性,且2015年出生的幼体体型更大;初生幼体大小与窝仔数无相关性。本研究表明,铅色水蛇的母体形态特征、后代特征存在年间变异,可能与不同年份温度、降水等因素有关,而其繁殖能量投入以及后代大小可能在自然选择压力下已得到优化。Reproductive life-history traits of reptiles are the important areas of animal evolutionary biology,but such studies in viviparous snakes are still scarce in China.In the current study,we detected the annual variation in reproductive life-history traits in a viviparous snake,Hypsiscopus plumbea,which was widely distributed in southern China.From 2013 to 2015,we brought 117 pregnant snakes in Wenzhou to our laboratory in July each year(2013:n=42;2014:n=46;2015:n=29),and measured the morphological traits of postpartum females and neonates after birth.We used one-way ANOVA or ANCOVA with post-hoc Tukey’s test to compare differences in life-history traits among years,and used linear regression to assess the relationship between two variables.Our results showed that females in 2013 had largest snout-vent length(Fig.1a)and body mass(Fig.1b)after birth.Body condition of postpartum females in 2015,which year was hot and dry(Table 1),was worse than those of other years(Fig.1c).Both litter size and litter mass were significantly positively correlated to maternal snout-vent length(Fig.2a,b),but no significant annual variation was found in litter size(Fig.3a)or litter mass(Fig.3b).The neonatal snout-vent length and body mass were not related to maternal snout-vent length.Neonates born in 2015 had largest snout-vent length(Fig.3c)and body mass(Fig.3d).No significant relationship was found between offspring size and litter size.In conclusion,annual variation in morphological traits of postpartum females and neonates in H.plumbea may be related to the local climate conditions,such as temperature and rainfall.Moreover,reproductive effort and offspring size in H.plumbea may have been optimized by natural selection.

关 键 词：卵胎生蛇类 形态 繁殖输出 后代大小 后代数量 

分 类 号：Q958[生物学—动物学]