FEMALE PREFERENCE FOR MALE SWORD LENGTH IN THE GREEN SWORDTAIL XIPHOPHORUS-HELLERI PISCES POECILIIDAE
FEMALE PREFERENCE FOR MALE SWORD LENGTH IN THE GREEN SWORDTAIL XIPHOPHORUS-HELLERI PISCES POECILIIDAE
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DOI：
10.1016/s0003-3472(05)80928-5
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发表时间：
1990-01-01
期刊：
影响因子：
2.5
通讯作者：
BASOLO A L
中科院分区：
文献类型：
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作者：
BASOLO A L
剑尾鱼的尾鳍结构表现出显着的性别二态性。雄性有一个色彩缤纷、细长的尾部附属物，称为剑，而雌性则没有。在对绿色剑尾剑尾蛇（Xiphophorus helleri）中雌性对雄性剑长度的偏好的实验室测试中，雌性被要求在一对剑长度自然或实验上不同的雄性之间进行选择，以检验这一特征的形成部分是雌性选择的结果的假设。对不同配对的雄性进行了五次测试，其中雄性之间的剑差异从 6 到 24 毫米不等。女性的偏好是通过对女性与男性交往的时间进行评分来衡量的。在所有五项测试中，女性更喜欢拥有更长剑的男性。女性偏好被证明是剑长度差异的递增函数：随着剑长度差异的增加，偏好的强度也增加。通过实验性地改变剑的长度，与剑长度相关的特征被消除作为偏好来源；当剑的相对长度颠倒时，偏好也会颠倒。这些结果表明，女性选择的性选择可能在这个词的演变中发挥了作用，并且女性的偏好是基于剑长度本身，而不是与剑长度相关的特征。
Swordtail fish exhibit a striking sexual dimorphism in the structure of the caudal fin; males have a colourful, elongated caudal appendage, termed a sword, that is absent in females. In laboratory tests of female preference for male sword length in the green swordtail, Xiphophorus helleri, females were given the choice between a pair of males differing naturally or experimentally in sword length to test the hypothesis that the elaboration of this trait is partially a consequence of female choice. Five tests with different pairs of males were conducted in which sword differences between paired males varied from 6 to 24 mm. Female preferences were measured by scoring the amount of time a female spent in association with each male. In all five tests, females preferred males with longer swords. Female preference was shown to be an increasing function of difference in sword length: as the difference in sword length increased, the strength of the preference increased. Characters correlated with sword length were eliminated as sources of preference by experimentally altering swords lengths; preferences were reversed when the relative sword lengths were reversed. These results suggest that sexual selection by female choice may have played a role in the evolution of the word and that female preference is based on sword length itself, and not on a character correlated with sword length.