Polyandry by wood mice in natural populations
Polyandry by wood mice in natural populations
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DOI：
10.1111/j.1469-7998.2007.00312.x
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发表时间：
2007-10-01
影响因子：
2
通讯作者：
Prodoehl, P. A.
中科院分区：
文献类型：
--
作者：
Booth, W.;Montgomery, W. I.;Prodoehl, P. A.
首次对黑线姬鼠自然种群的多重亲子关系进行了研究。对在不同生境、不同季节和不同年份采集的13只雌性和它们各自的幼崽进行了8个微卫星座位的筛查。等位基因变异与包括307只成年小鼠的数据集进行了比较，这些成年小鼠来自与怀孕雌性小鼠相同的来源群体。在7窝(53.8%)产仔中明确地识别出多重父亲。在每个案例中，至少有两到三名男性父母参与其中。栖息在该物种范围北纬地区的天牛种群具有年度丰度周期的特点，在此期间，种群数量可以波动几个数量级。因此，在所有年份的5月至7月期间(分别为高密度和低密度)的窝仔中发现了多重父子关系，这表明一夫多妻制最大限度地增加了窝仔的遗传多样性，从而使一些后代在这样的周期中存活下来。结果表明，一夫多妻制是野生种群中常见的生殖方式。
Multiple paternity was investigated for the first time in natural populations of the wood mouse Apodemus sylvaticus. Thirteen females and their respective litters sampled within distinct habitats, seasons and years were screened for eight microsatellite loci. Allelic variation was compared with a dataset comprising 307 adult mice collected from the same source populations as pregnant females. Multiple paternity was unambiguously identified in seven litters (53.8%). In each case, a minimum of two or three male parents were involved. Populations of A. sylvaticus inhabiting the northern latitudes of the species range are characterized by annual cycles of abundance during which numbers can fluctuate by several orders of magnitude. Hence, the discovery of multiple paternity within litters sampled between May and July (high and low densities, respectively) in all years suggests that polyandry maximizes genetic diversity of the litter and, hence, survival of some of the offspring through such cycles. The results indicate that polyandry is a common mode of reproduction within wild populations of A. sylvaticus.