Multiple paternity and the number of offspring: A model reveals two major groups of species
Multiple paternity and the number of offspring: A model reveals two major groups of species
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DOI：
10.1002/bies.202000247
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发表时间：
2021-01-25
期刊：
影响因子：
4
通讯作者：
Dobson, F. Stephen
中科院分区：
文献类型：
--
作者：
Correia, Hannah E.;Abebe, Ash;Dobson, F. Stephen
通过微卫星标记进行的亲子关系分析显示，哺乳动物、爬行动物、两栖动物、鱼类和无脊椎动物等多胞胎物种的亲子关系存在多重亲缘关系。这种普遍存在的多父现象可能与性别选择和亲缘选择等进化过程有关。然而，一个物种到底应该表现出多少多重父子关系呢？我们开发了贝叶斯零模型来解释多重父子关系与幼崽大小的关系。对于已公布的114个物种中的每一个物种，我们将零模型估计值与已公布的多重父子关系频率进行了比较。大多数物种接近我们的零模型，特别是在鱼类和无脊椎动物物种中。然而，一些物种的多父子关系概率很低，与零模型的预测相去甚远，可能是由于性别选择和环境限制。我们建议在物种的交配系统之间进行重大划分，即接近随机交配和高水平多父子关系的物种，以及那些限制产生低水平多父子关系的物种。
Parentage analyses via microsatellite markers have revealed multiple paternity within the broods of polytocous species of mammals, reptiles, amphibians, fishes and invertebrates. The widespread phenomenon of multiple paternity may have attending relationships with such evolutionary processes as sexual selection and kin selection. However, just how much multiple paternity should a species exhibit? We developed Bayesian null models of how multiple paternity relates to brood sizes. For each of 114 species with published data on brood sizes and numbers of sires, we compared our null model estimates to published frequencies of multiple paternity. The majority of species fell close to our null model, especially among fish and invertebrate species. Some species, however, had low probabilities of multiple paternity, far from the predictions of the null model, likely due to sexual selection and environmental constraints. We suggest a major division among species' mating systems between those with close to random mating and high levels of multiple paternity, and those with constraints that produce low levels of multiple paternity.