蓝尾石龙子的生长、两性异形及雌性繁殖  

Growth,Sexual Size Dimorphism and Female Reproduction of Blue- tailed Skinks,Eumeces elegans

作　　者：杜卫国[1] 计翔[1] 

机构地区：[1]杭州师范学院生物系,杭州310036

出　　处：《Zoological Research》2001年第4期279-286,共8页动物学研究（英文）

基　　金：浙江省自然科学基金青年人才专项基金;浙江省 15 1人才基金;杭州市人才基金资助项目

摘　　要：报道蓝尾石龙子 (Eumeceselegans)的生长、两性异形和雌性繁殖。性成熟个体体色的两性差异显著 ,成年雄性体长、头长和头宽显著大于成年雌性。幼体体长生长率无显著的两性差异 ,成年雄体体长生长率显著大于成年雌体 ,因此 ,个体大小的两性异形是性成熟后发生的。体长小于 5 0mm的幼体 ,头长和头宽无两性差异 ;当体长大于 5 0mm ,雄性头长和头宽随体长的生长率显著大于雌性 ,并导致头部大小的两性异形 ,并随个体发育变得越来越显著。蓝尾石龙子产卵雌体的最小体长为 69 3mm ,大于此体长的雌体均年产单窝卵。窝卵数、窝卵重和平均卵重均与雌体体长呈正相关 ,平均值分别为 6 4、 2 783和 0 5 5 4g。窝卵数与雌体产后状态无关。蓝尾石龙子雌体主要通过增加窝卵数和卵大小来增加繁殖输出。We report data on growth,sexual dimorphism and female reproduction for blue-tailed skinks,Eumeces elegans,from a population in Hangzhou,Zhejiang,eastern China.All the animals were captured from the field and then raised in the laboratory.The body and head sizes of 449 skinks were measured to indicate ontogenetic changes in sexual size dimorphism.The growth of 94 juveniles and 50 adults and the reproductive output of 12 adult females were determined.We pay particular attention to the point during ontogeny at which males and females diverge in body size (SVL) and head size (length and width) and the way through which females increase their reproductive output.Adults were sexually dimorphic in coloration,body size and head size,with male adults being larger in both body and head size than female adults.Newly emerged young did not show sex difference in SVL,and male and female juveniles (SVL <69.3?mm) exhibit isometric growth pattern of SVL.Male and female adults (SVL >69.3?mm) showed allometric growth pattern of SVL,as male adults grew faster than female adults.Therefore,It was concluded that sexual dimorphism in body size of E.elegans occured only in adults.Our data revealed that male and female juveniles larger than 50?mm SVL began to diverge in head size,with males having larger heads than female's.This sexual dimorphism resulted from the greater head growth rate relative to SVL in males when their SVLs were larger than 50?mm SVL,and became increasingly pronounced in adults.The sexual dimorphism in body and head size suggested that the strategy of energy partition of adult males and females was different.Adult males partition relatively more energy into body and head growth so as to improve the reproductive fitness,in contrast,adult females partition relatively more energy into reproductive investment other than body growth.Morever,adult females partition relatively less energy into head growth but more into carcass growth,thereby leaving a larger space for containing more eggs.The smallest reproductive female in

关 键 词：石龙子科 蓝尾石龙子 生长 两性异形 雌性繁殖 

分 类 号：Q959.6[生物学—动物学]