Extra-pair paternity in monogamous tree swallows
Extra-pair paternity in monogamous tree swallows
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DOI：
10.1006/anbe.1993.1028
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发表时间：
1993-02
期刊：
影响因子：
2.5
通讯作者：
J. Lifjeld;Peter O. Dunn;R. Robertson;P. Boag
中科院分区：
文献类型：
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作者：
J. Lifjeld;Peter O. Dunn;R. Robertson;P. Boag
抽象抽象。一对树燕子后代的多位点DNA指纹图谱显示，50%(8/16)的幼燕包含额外配对的雄性后代，总计38%(33/86)的后代被分析。没有幼虫是由种内幼虫寄生造成的。双亲亲子关系的分布呈双峰型，每窝无私生子或私生子多。33%的私生子是由三到五个最近的男性邻居生的。雌性经常在自己的盒子里与自己的配偶交配，但从未被看到与其他雄性交配。因此，超配对交配率和超配对受精率之间存在明显的反差。配对交配率和一窝私生子的比例之间没有关系，这表明雄性不能将与配偶进行交配的次数作为其父亲份额的可靠线索。雄性供养幼崽的速度几乎与雌性相同，与只有合法后代的雄性相比，在巢中有非婚生后代的雄性并不会减少供养努力。因此，女性没有因为乱交而遭受任何明显的代价。人们争辩说，雌性控制着交配的精子转移成功。由于雌性不会从额外配对的交配中获得精子以外的任何东西，这种混杂行为很可能是由一些增强雌性健康的遗传因素推动的。尽管所提供的数据似乎与女性对男性遗传质量的选择一致，但受精成功率高的男性没有可检测到的表型特征。
Abstract Abstract. Multilocus DNA fingerprinting of offspring of monogamous pairs of tree swallows, Tachycineta bicolor , revealed that 50% (8/16) of broods contained young sired by extra-pair males, totalling 38% (33/86) of all offspring analysed. No young resulted from intraspecific brood parasitism. The distribution of extra-pair paternity showed a bimodal pattern; either none or many illegitimate young per brood. Thirty-three per cent of illegitimate offspring were sired by three to five nearest male neighbours. Females copulated frequently with their own mate at their own box, but they were never seen copulating with other males. Hence, there was a striking contrast between the rate of extra-pair copulation and the rate of extra-pair fertilization. There was no relationship between the pair copulation rate and the proportion of illegitimate young in a brood, suggesting that males cannot use the number of copulations performed with their mate as a reliable cue to their share of paternity. Males provisioned their young at nearly the same rate as did females, and males with illegitimate offspring in their nest did not reduce provisioning effort compared to males with only legitimate offspring. Hence, females did not suffer any apparent costs of promiscuity. It is argued that females control the sperm transfer success of copulations. Because females do not receive anything other than sperm from extra-pair copulation, the promiscuous behaviour is probably driven by some genetic factors enhancing female fitness. Although the data presented seem consistent with female choice for male genetic quality, there were no detectable phenotypic characteristics of males with high fertilization success.