The relationship between sexual size dimorphism and habitat use in Greater Antillean Anolis Lizards
The relationship between sexual size dimorphism and habitat use in Greater Antillean Anolis Lizards
复制标题
DOI：
10.1111/j.0014-3820.2000.tb00026.x
复制
发表时间：
2000-02-01
期刊：
影响因子：
3.3
通讯作者：
Losos, JB
中科院分区：
文献类型：
--
作者：
Butler, MA;Schoener, TW;Losos, JB
性别大小二态性（SSD）是选择对雄性和雌性身体大小的不同作用的进化结果。大安的列斯群岛的阿诺利斯蜥蜴物种被分为生态类，主要是基于它们的结构栖息地（栖息高度和直径）。我们发现，主要的ecomorph类不同程度的SSD。至少支持两种SSD类别：高SSD（树干-树冠，树干-地面）和低SSD（树干，树冠-巨人，草-灌木，树枝）。差异不能归因于SSD与身体大小或系统发育效应的异速生长增加。第三种解释，男性和/或女性的身体大小不同的栖息地类型的选择压力，通过评估期望的主要相关种类的选择压力。虽然没有一种选择压力产生的期望与所有的信息一致，结构栖息地和性选择压力方面的竞争更可能比猎物大小或最佳摄食压力方面的竞争的可能性。栖息地特异性两性异形的存在表明，安氏物种对环境的适应比以前认识到的要复杂得多。
Sexual size dimorphism (SSD) is the evolutionary result of selection operating differently on the body sizes of males and females. Anolis lizard species of the Greater Antilles have been classified into ecomorph classes, largely on the basis of their structural habitat (perch height and diameter). We show that the major ecomorph classes differ in degree of SSD. At least two SSD classes are supported: high SSD (trunk-crown, trunk-ground) and low SSD (trunk, crown-giant, grass-bush, twig). Differences cannot be attributed to an allometric increase of SSD with body size or to a phylogenetic effect. A third explanation, that selective pressures on male and/or female body size vary among habitat types, is examined by evaluating expectations from the major relevant kinds of selective pressures. Although no one kind of selective pressure produces expectations consistent with all of the information, competition with respect to structural habitat and sexual selection pressures are more likely possibilities than competition with respect to prey size or optimal feeding pressures. The existence of habitat-specific sexual dimorphism suggests that adaptation of Anolis species to their environment is more complex than previously appreciated.