CAJ | 학술논문

蜥蜴繁殖成功率与其形态特征有密切的关系.作者在内蒙古乌拉特后旗采集密点麻蜥(Eremias multiocellata),定量研究该种形态特征的两性异形和雌体繁殖特征,检验与成体形态特征相关的两性繁殖成功率差异是否能促进两性异形的进化.密点麻蜥成体个体大小无显著的两性差异,但头部大小两性差异显著;雄性个体的头长和头宽均大于体长相同的雌性成体.繁殖雌体于五、六月份排卵;在实验室条件下,雌体在六月下旬至七月下旬之间产仔.该种雌体年产单窝仔,每窝2-4仔.窝仔重与雌体体长呈正相关,但雌体体长仅能解释很少一部分(约19%)窝仔重的变异.窝仔数和幼仔重均与雌体体长无关.幼仔重与相对生育力(相对于雌体体长的窝仔数)呈显著的负相关,表明该种蜥蜴存在后代数量-大小之间的权衡.密点麻蜥雄体和雌体向较大体型方向进化的选择压力均相对较弱,与成体头部大小相关的两性繁殖成功率的差异是导致该种蜥蜴头部大小两性异形进化的主要原因[动物学报52(2):250-255,2006].
석척번식성공솔여기형태특정유밀절적관계.작자재내몽고오랍특후기채집밀점마석(Eremias multiocellata),정량연구해충형태특정적량성이형화자체번식특정,검험여성체형태특정상관적량성번식성공솔차이시부능촉진량성이형적진화.밀점마석성체개체대소무현저적량성차이,단두부대소량성차이현저;웅성개체적두장화두관균대우체장상동적자성성체.번식자체우오、륙월빈배란;재실험실조건하,자체재륙월하순지칠월하순지간산자.해충자체년산단와자,매와2-4자.와자중여자체체장정정상관,단자체체장부능해석흔소일부분(약19%)와자중적변이.와자수화유자중균여자체체장무관.유자중여상대생육력(상대우자체체장적와자수)정현저적부상관,표명해충석척존재후대수량-대소지간적권형.밀점마석웅체화자체향교대체형방향진화적선택압력균상대교약,여성체두부대소상관적량성번식성공솔적차이시도치해충석척두부대소량성이형진화적주요원인[동물학보52(2):250-255,2006].
Reproductive success and morphological traits are intimately linked in lizards. We collected adult multi-ocellated racerunners Eremias multiocellata from a population in Inner Mongolia (northern China) to quantify sexual dimorphism and female reproductive characteristics of this poorly studied viviparous, lacertid lizard, testing for the prediction that the evolution of sexual dimorphism is promoted by between-sex differences in reproductive success relating to adult morphological traits. Adults are sexually dimorphic in head size but not in body size, with males having longer and wider heads than do females of the same body length. Females ovulate from May to June and, under laboratory conditions, they give birth to young from late June to late July. Litter size ranges from two to four young. Litter mass is positively correlated with female SVL, but female SVL only explains a small portion (approximately 19 % ) of variation in litter mass. Both litter size and neonate mass are not correlated with female SVL. Neonate mass is negatively correlated with relative fecundity (litter size relative to female SVL), suggesting a trade-off between size and number of offspring in E. multiocellata. Overall,selective pressures towards large male and large females are both relatively weak in E. multiocellata, and the evolution of sexual dimorphism in head size results mainly from between-sex differences in reproductive success relating to adult head size [Acta Zoologica Sinica 52 (2): 250-255, 2006].