Danforth Bryan N, Neff John L, Barretto-Ko Percival
Department of Entomology, Comstock Hall, Cornell University, Ithaca, New York, 14853.
Central Texas Melittological Institute, 7307 Running Rope, Austin, Texas, 78731.
Evolution. 1996 Feb;50(1):276-284. doi: 10.1111/j.1558-5646.1996.tb04491.x.
Perdita texana is a facultatively communal bee species with up to 28 females per nest. We used multilocus DNA fingerprinting to test the hypothesis that nestmates are more closely related to each other than are nonnestmates. The mean band sharing proportion among pairwise nestmate comparisons did not differ significantly from the mean among nonnestmate comparisons [P = 0.787 (df = 484)]. Although mean band sharing proportions did not differ among nestmates and nonnestmates, some nestmates show very high band sharing proportions (in excess of the upper 95% confidence limit for the nonnestmate mean). These individuals almost certainly are related, probably as half-sib sisters, however, they comprise a very small percentage of the nestmate populations. Our results indicate that kin selection is unlikely to play an important role in the evolution and maintenance of communal nesting. Communal societies most likely arise because of the mutualistic benefits of cooperative nesting, including accelerated nest founding and improved nest defense.
德克萨斯珀迪塔蜂是一种兼性群居的蜜蜂物种，每个巢穴中最多有28只雌蜂。我们使用多位点DNA指纹图谱来检验一个假设，即同巢个体之间的亲缘关系比非同巢个体之间的亲缘关系更密切。同巢个体两两比较之间的平均条带共享比例与非同巢个体比较之间的平均比例没有显著差异[P = 0.787（自由度= 484）]。尽管同巢个体和非同巢个体之间的平均条带共享比例没有差异，但一些同巢个体显示出非常高的条带共享比例（超过非同巢个体平均值的95%置信上限）。这些个体几乎肯定是有亲缘关系的，可能是半同胞姐妹，然而，它们在同巢个体群体中所占的比例非常小。我们的结果表明，亲缘选择不太可能在群居筑巢的进化和维持中发挥重要作用。群居社会最有可能出现是因为合作筑巢的互利好处，包括加速筑巢和改善巢穴防御。
