Reduction of sexual dimorphism in stream-resident forms of three-spined stickleback Gasterosteus aculeatus.
Reduction of sexual dimorphism in stream-resident forms of three-spined stickleback Gasterosteus aculeatus.
复制标题
减少溪流中三刺刺鱼 Gasterosteus aculeatus 的性别二态性。
DOI：
10.1111/j.1095-8649.2011.03161.x
复制
发表时间：
2012
影响因子：
2
通讯作者：
Peichel,CL
中科院分区：
文献类型：
--
作者：
Kitano,J;Mori,S;Peichel,CL
对采自北美和日本的三棘鱼Gasterosteus aculeatus的海洋型和溪流型在几何体形和外部形态上的两性异形进行了比较。两性异形的某些方面是共享的生态型：男性有较大的头比女性没有显着的影响生态型的大小两性异形。相比之下，一个显着的性别由生态型的相互作用被发现的身体深度。在这两种形式中，雄性往往比雌性有更深的身体，但在溪流居民形式中，两性异形的程度降低了。虽然女性一般较大的标准长度，并有较大的骨盆带，在这些特征显着的性二型性并不一致的人群或生态型。这些结果表明，性二型的某些方面是共享的生态型之间，而另一些是独特的每个种群。结果进一步表明，生态可能会影响一些外部形态特征，如身体深度的性二型的进化。
Sexual dimorphism in geometric body shape and external morphology was compared between marine and stream‐resident forms of three‐spined sticklebackGasterosteus aculeatuscollected from North America and Japan. Some aspects of sexual dimorphism were shared between ecotypes: males had larger heads than females with no significant effect of ecotype on the magnitude of sexual dimorphism. By contrast, a significant sex‐by‐ecotype interaction was found for body depth. Males tended to have deeper bodies than females in both forms, but the magnitude of sexual dimorphism was reduced in stream‐resident forms. Although females were generally larger in standard length and had larger pelvic girdles, significant sexual dimorphism in these traits was not consistently found across populations or ecotypes. These results suggest that some aspects of sexual dimorphism were shared between ecotypes, while others were unique to each population. The results further suggest that ecology may influence the evolution of sexual dimorphism in some external morphological traits, such as body depth.