Molecular insight into patterns of colony composition and paternity in the common mole-rat Cryptomys hottentotus hottentotus
Molecular insight into patterns of colony composition and paternity in the common mole-rat Cryptomys hottentotus hottentotus
复制标题
DOI：
10.1111/j.1365-294x.2004.02131.x
复制
发表时间：
2004-05-01
影响因子：
4.9
通讯作者：
O'Ryan, C
中科院分区：
文献类型：
--
作者：
Bishop, JM;Jarvis, JUM;O'Ryan, C
我们报告发现种内变异的群体组成和模式的父系在两个人口的社会常见的鼹鼠，大鼠Cryptomys hottentotus hottentotits。这两个种群代表了该物种在南非广泛生态范围内的中间和栖息地极端。直到最近，普通鼹鼠的群体被认为是由家庭群体组成的，所有的群体成员都是一对一夫一妻制繁殖的后代。其余的殖民地成员被认为放弃繁殖，直到社会和生态条件有利于分散和独立的远系繁殖的机会。使用微卫星标记的遗传分配测试的结果表明，虽然殖民地的组成是由家庭群体为主，两个人口内的殖民地包括成人和亚成人外国同种。亲子关系分析表明，C.霍腾托特不是严格的一夫一妻制;后代的父亲身份并不总是被分配给殖民地内最大、最具统治力的雄性。此外，一些显着较小的男性被发现父系后代，这表明一个潜行交配策略的下属内殖民地男性。群体外配对外亲子关系（ECP）也被发现是C。它。hottentotus殖民地，发生在两个栖息地相似的频率。这两个占主导地位的建立育种男性和下属男性被确定为父系年轻的非源殖民地。此外，建立繁殖男性被发现在同一个季节，在他们的源殖民地繁殖年轻的父系外殖民地年轻。我们讨论了这些结果的意义的背景下，不同的生态制度特征的两个网站，并观察到，我们的研究结果重新使用的行为和形态特征的准确性，这构成了我们的理解的基础上，该物种的行为生态，作为指标的标记-重捕研究的繁殖状态。
We report the discovery of intraspecific variation in both colony composition and patterns of paternity in two populations of the social common mole-rat Cryptomys hottentotus hottentotits. These two populations represent the mesic and and habitat extremes of the species' broad ecological range in South Africa. Until recently colonies of the common mole-rat were thought to consist of familial groups whereby all colony members were the offspring of a monogamous reproductive pair. The remaining colony members were thought to forego reproduction until both social and ecological conditions favoured dispersal and opportunities for independent outbreeding. Results from genetic assignment tests using microsatellite markers indicate that while colony composition is dominated by familial groups, colonies within both populations included both adult and subadult foreign conspecifics. Analysis of parentage reveals that the social organization of C. It. hottentotus is not that of strict monogamy; paternity of offspring was not assigned consistently to the largest, most dominant male within the colony. Moreover, a number of significantly smaller males were found to sire offspring, suggesting a sneak-mating strategy by subordinate within-colony males. Extra-colony extra-pair paternity (ECP) was also found to characterize C. It. hottentotus colonies, occurring with similar frequencies in both habitats. Both dominant established breeding males and subordinate males were identified as siring young in nonsource colonies. Furthermore, established breeding males were found to sire extra-colony young in the same season as siring young within their source colonies. We discuss the significance of these results within the context of the divergent ecological regimes characterizing the two sites and observe that our results revisit the accuracy of using behavioural and morphological characters, which have structured the basis of our understanding of the behavioural ecology of this species, as indicators of breeding status in mark-recapture studies.