雌性鬃狮蜥个体存在持续的性别比例偏差。
Consistent sex ratio bias of individual female dragon lizards.
作者信息
Uller Tobias, Mott Beth, Odierna Gaetano, Olsson Mats
机构信息
School of Biological Sciences, University of Wollongong, 2500 New South Wales, Australia.
出版信息
Biol Lett. 2006 Dec 22;2(4):569-72. doi: 10.1098/rsbl.2006.0526.
Sex ratio evolution relies on genetic variation in either the phenotypic traits that influence sex ratios or sex-determining mechanisms. However, consistent variation among females in offspring sex ratio is rarely investigated. Here, we show that female painted dragons (Ctenophorus pictus) have highly repeatable sex ratios among clutches within years. A consistent effect of female identity could represent stable phenotypic differences among females or genetic variation in sex-determining mechanisms. Sex ratios were not correlated with female size, body condition or coloration. Furthermore, sex ratios were not influenced by incubation temperature. However, the variation among females resulted in female-biased mean population sex ratios at hatching both within and among years.
性别比例的进化依赖于影响性别比例的表型性状或性别决定机制中的遗传变异。然而，很少有人研究雌性后代性别比例之间的一致性变异。在这里，我们表明雌性彩绘龙（Ctenophorus pictus）在几年内的不同窝次之间具有高度可重复的性别比例。雌性身份的一致影响可能代表了雌性之间稳定的表型差异或性别决定机制中的遗传变异。性别比例与雌性大小、身体状况或体色无关。此外，性别比例不受孵化温度的影响。然而，雌性之间的变异导致了孵化时种群平均性别比例在年内和年间都偏向雌性。
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