摘要
Sex-biased dispersal,in which individuals of one sex tend to disperse and breed at a greater distance from their natal site than individuals of the opposite sex,appears to be common in vertebrate organisms and is very important to population structures and dynamics.Many studies have documented the dispersal patterns of monogamous birds; however,observations and data are few for polygynous birds.In our study,we report on the indication of sex-biased dispersal in Elliot's Pheasant (Syrmaticus ellioti),a vulnerable species endemic to China,using polymorphic DNA microsatellite loci (105 individual birds and seven loci) and mitochondrial DNA control-region sequences (63 birds).Contrary to the traditional concept that males are the more philopatric sex and females the more dispersing sex in birds,all the genetic information extracted from the two markers suggests that male-biased dispersal is predominant in Elliot's Pheasant.We argue that polygynous species in Galliformes without lekking behavior are more likely to exhibit male-biased dispersal patterns,consistent with the expected results based on the polygynous mating system of Elliot's Pheasant.
一种性别的个体倾向于比另一性别的个体扩散到离出生地较远的地方,这种现象称为性别偏倚扩散。性别偏倚扩散现象在脊椎动物中很常见,对种群结构和种群动态有着非常重要的作用。许多研究已经证明了一夫一妻制鸟类的扩散模式,然而有关一夫多妻制鸟类的研究和数据还是很少。白颈长尾雉(Syrmaticus ellioti)是中国特有的濒危物种。本研究中,我们使用多态性DNA微卫星位点(105个个体和7个位点)和线粒体DNA控制区序列(63个个体)来研究白颈长尾雉的性别偏倚扩散模式。传统的观点认为,鸟类中雌性个体比雄性个体更具扩散性。与此不同的是,本文中两种遗传标记所得的遗传信息都表明,白颈长尾雉的扩散模式是雄性偏倚的。我们认为,在鸡形目中,不具群集展示行为的一夫多妻制物种更加倾向于雄性偏倚扩散模式。该推论与基于白颈长尾雉一夫多妻的婚配体制所得到的结果是相一致的。
基金
supported by grants fromthe National Natural Science Foundation of China(30470232)
