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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Relatedness threshold for the production of female sexuals in colonies of a polygynous ant, Myrmica tahoensis, as revealed by microsatellite DNA analysis.
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Relatedness threshold for the production of female sexuals in colonies of a polygynous ant, Myrmica tahoensis, as revealed by microsatellite DNA analysis.

机译：微卫星DNA分析显示，多雌性蚂蚁Tahoensis菌落中雌性产生的相关性阈值。

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摘要

The genetic relationships of colony members in the ant Myrmica tahoensis were determined on the basis of highly polymorphic microsatellite DNA loci. These analyses show that colonies fall into one of two classes. In roughly half of the sampled colonies, workers and female offspring appear to be full sisters. The remaining colonies contain offspring produced by two or more queens. Colonies that produce female sexuals are always composed of highly related females, while colonies that produce males often show low levels of nestmate relatedness. These results support theoretical predictions that workers should skew sex allocation in response to relatedness asymmetries found within colonies. The existence of a relatedness threshold below which female sexuals are not produced suggests a possible mechanism for worker perception of relatedness. Two results indicate that workers use genetic cues, not queen number, in making sex-allocation decisions. (i) The number of queens in a colony was not significantly correlated with either the level of relatedness asymmetry or the sex ratio. (ii) Sex-ratio shifts consistent with a genetically based mechanism of relatedness assessment were seen in an experiment involving transfers of larvae among unrelated nests. Thus workers appear to make sex-allocation decisions on the basis of larval cues and appear to be able to adjust sex ratios long after egg laying.
机译：基于高度多态的微卫星DNA基因座，确定了塔霍玛尔梅（Myrmica tahoensis）蚁群成员的遗传关系。这些分析表明，菌落属于两类之一。在大约一半的采样殖民地中，工人和女性后代看起来是全姐妹。其余的殖民地包含两个或多个女王产生的后代。产生雌性的菌落总是由高度相关的雌性组成，而产生雄性的菌落通常显示低水平的巢伴侣相关性。这些结果支持理论上的预测，即工人应根据殖民地内发现的相关性不对称而歪曲性别分配。存在相关性阈值（低于该阈值不会产生女性性行为）表明，工人可能会感觉到相关性。有两个结果表明，工人在做出性别分配决策时会使用遗传线索而非女王号。 （i）群体中的皇后数量与相关性不对称程度或性别比均无显着相关性。 （ii）在涉及幼虫在不相关巢穴间转移的实验中，观察到与基于遗传学的相关性评估机制相符的性别比率变化。因此，工人似乎根据幼虫的提示做出性别分配决定，并且似乎能够在产卵后很长时间调整性别比例。

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