Extra‐pair paternity in relation to male age in Bullock’s orioles
Extra‐pair paternity in relation to male age in Bullock’s orioles
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DOI：
10.1046/j.1365-294x.1999.00832.x
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发表时间：
1999-12
影响因子：
4.9
通讯作者：
David S. Richardson;T. Burke
中科院分区：
文献类型：
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作者：
David S. Richardson;T. Burke
单基因座小卫星 DNA 分析用于确定布洛克黄鹂 (Icterus galbula bullockii) 群体的亲子关系，并确定年龄对雄性成功获得额外配对亲子关系的影响。种内巢寄生率非常低（2/202 = 雏鸡的 1.0%）。与一岁亚成年雄性相比，老年雄性失去的配对内亲子关系较少，并且获得了更多的配对外受精。这导致成年男性每年的繁殖成功率是亚成年男性的两倍多。用于确定雌性选择在配对外交配 (EPC) 中的作用的行为观察表明，雌性积极参与 EPC，并且更喜欢从年长雄性那里获得 EPC。虽然雌性获得 EPC 可能是为了防止其社会伴侣可能不育，但这项研究的结果最符合这样的假设：雌性试图通过与年龄较大、质量更好的雄性获得 EPC 来为后代获得更高质量的基因。
Single‐locus minisatellite DNA profiling was used to assign paternity in a population of Bullock’s orioles, Icterus galbula bullockii, and to determine the contribution of age to a male’s success in obtaining extra‐pair paternity. There was a very low rate of intraspecific brood parasitism (2/202 = 1.0% of chicks). Older adult males lost less within‐pair paternity and gained more extra‐pair fertilizations than did yearling subadult males. This resulted in adult males benefiting from an annual reproductive success more than double that of subadult males. Behavioural observations, used to determine the role of female choice in extra‐pair copulations (EPCs), indicated that females actively participate in EPCs and that they prefer to obtain them from older males. While it was possible that females obtained EPCs as an insurance against the possible infertility of their social mate, the results of this study fit best with the hypothesis that females were attempting to obtain better‐quality genes for their offspring by obtaining EPCs with older, better‐quality males.