Fluctuating asymmetry, spot asymmetry and inbreeding depression in the sexual coloration of male guppy fish
Fluctuating asymmetry, spot asymmetry and inbreeding depression in the sexual coloration of male guppy fish
复制标题
雄性孔雀鱼性色的波动不对称、斑点不对称和近交衰退
作者：
L. Sheridan;A. Pomiankowski
本文测试的假设，波动的不对称性夸张的性特征是一个敏感的指标遗传压力。近亲繁殖被用来创造遗传压力，在两个种群的雄性孔雀鱼收集从阿里波和帕里亚河流域在特立尼达岛。波动不对称的类胡萝卜素，黑色素和虹彩色素的大小没有不同的近交系和控制男性。斑点不对称性也没有差异。缺乏反应不是由于近亲繁殖对雄性表型没有影响。近亲繁殖的Aripo雄性有较少的黑色素，较少的黑色素斑点和较少的虹彩子斑点，Paria雄性有较少的类胡萝卜素色素。我们的研究结果表明，孔雀鱼的性着色是敏感的遗传压力所造成的近亲繁殖，但他们没有提供支持的假设，即遗传压力的波动不对称的程度反映得特别好。两个种群对近亲繁殖的不同反应很有趣。有近亲繁殖的抑郁症在该地区的类胡萝卜素色素的Paria人口，这一特点是众所周知的影响女性择偶，而没有近亲繁殖的抑郁症的Aripo人口，其中女性没有表现出可检测的偏好类胡萝卜素色素。
This paper tests the hypothesis that fluctuating asymmetry in exaggerated sexual traits is a sensitive indicator of genetic stress. Inbreeding was used to create genetic stress in two populations of male guppies collected from the Aripo and Paria river basins in Trinidad. Fluctuating asymmetry in the size of carotenoid, melanin and iridescent pigments did not differ between inbred and control males. There was also no difference in spot asymmetry. The lack of response was not caused by inbreeding having no effect on the male phenotype. Inbred Aripo males had less melanin pigment, fewer melanin spots and fewer iridescent subspots, and Paria males had less carotenoid pigment. Our results show that sexual coloration in guppies is sensitive to genetic stress caused by inbreeding, but they provide no support for the hypothesis that genetic stress is reflected particularly well by the degree of fluctuating asymmetry. The different response to inbreeding in the two populations is interesting. There was inbreeding depression in the area of carotenoid pigment in the Paria population, in which this characteristic is known to influence female mate choice, whereas there was no inbreeding depression in the Aripo population, in which females show no detectable preference for carotenoid pigments.