Sexual dimorphism and adaptive radiation in Anolis lizards

被引:175
作者
Butler, Marguerite A.
Sawyer, Stanley A.
Losos, Jonathan B.
机构
[1] Univ Hawaii Manoa, Dept Zool, Honolulu, HI 96822 USA
[2] Washington Univ, Dept Biol, St Louis, MO 63130 USA
[3] Washington Univ, Dept Math, St Louis, MO 63130 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature05774
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Sexual dimorphism is widespread and substantial throughout the animal world(1,2). It is surprising, then, that such a pervasive source of biological diversity has not been integrated into studies of adaptive radiation, despite extensive and growing attention to both phenomena(1,3-7). Rather, most studies of adaptive radiation either group individuals without regard to sex or focus solely on one sex. Here we show that sexual differences contribute substantially to the ecomorphological diversity produced by the adaptive radiations of West Indian Anolis lizards: within anole species, males and females occupy mostly non-overlapping parts of morphological space; the overall extent of sexual variation is large relative to interspecific variation; and the degree of variation depends on ecological type. Thus, when sexual dimorphism in ecologically relevant traits is substantial, ignoring its contribution may significantly underestimate the adaptive component of evolutionary radiation. Conversely, if sexual dimorphism and interspecific divergence are alternative means of ecological diversification, then the degree of sexual dimorphism may be negatively related to the extent of adaptive radiation.
引用
收藏
页码:202 / 205
页数:4
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