| 中国石龙子个体发育过程中头部两性异型和食性的变化 |
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| 引用本文： | 马小梅,计翔.中国石龙子个体发育过程中头部两性异型和食性的变化[J].生态学杂志,2001,20(3):12-16. |
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| 作者姓名： | 马小梅 计翔 |
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| 作者单位： | 杭州师范学院生物学系,杭州,310036 |
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| 基金项目： | 浙江省自然科学基金青年人才专项基金、浙江省151人才基金和杭州市跨世纪人才基金资助项目. |
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| 摘 要： | 许多动物呈现个体大小、局部形态特征 (头部大小 )和体色的两性异形5,14 ,15,2 1,2 2 ] 。 Darwin12 ] 认为两性谋求各自最大的繁殖利益导致了两性异形 ,因此两性异形是性选择压力作用的结果。自 Darwin以来 ,许多同行认为性选择压力和非性选择压力均能导致动物的两性异形 ,两种选择压力在不同的动物中所起的作用是不同的 2～ 5,7,10 ,16,2 1～ 2 6] 。性选择压力导致的两性异形与繁殖成功率直接有关。非性选择压力导致的两性异形与繁殖成功率无关或无直接的关系 ,如两性寿命的差异 13 ]、两性食性的分离 6,2 1]和两性分配用于生长的…
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| 关 键 词： | 中国石龙子 动物 个体发育 头部形态 两性异型 食性 |
| 文章编号： | 1000-4890(2001)03-0012-05 |
| 修稿时间： | 1998年12月28 |
Ontogenetic Changes in Sexual Dimorphism in Head Size and Food Habits in the Chinese Skink, Eumeces Chinensis. |
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| Ma Xiaomei,Ji Xiang.Ontogenetic Changes in Sexual Dimorphism in Head Size and Food Habits in the Chinese Skink, Eumeces Chinensis.[J].Chinese Journal of Ecology,2001,20(3):12-16. |
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| Authors: | Ma Xiaomei Ji Xiang |
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| Abstract: | The Chinese skink ( Eumeces chinensis) is sexually dimorphic in both body size and head size,and males are the larger.A comprehensive analysis of the ecological and evolutionary sources of sex differences in growth and size of head requires a detailed understanding of growth trajectories during ontogeny.Here,we pay particular attention to the point during ontogeny at which males and females diverge.Hatchlings (newly emerged young) and juveniles smaller than 70 mm SVL do not exhibit sexual dimorphism in head size,whereas males and females larger than 70mm SVL begin to diverge.The sexual dimorphism in head size is much more pronounced in adults than in juveniles sharing this character.Adult females partition relatively less resources into head growth but more into carcass growth,thereby leaving a larger space for eggs so as to increase reproductive output.Adult males,on the contrary,partition relatively more resources into head growth,thereby increasing their reproductive success and enhancing their ability to defend predators.Skinks at different ontogenetic stages slightly differ in food niche width and breadth.However,no direct evidence shows a substantial contribution of the divergence in head size to the segregation of food niche between males and females.Our results indicate that sexual selection is the main evolutionary source of sexual dimorphism in body and head sizes in E.chinensis . |
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| Keywords: | Eumeces chinensis sexual dimorphism food habit food niche overlap food niche breadth |
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