Reproductive Conflicts and Levels of Selection in the Ant Pristomyrmex pungens: Contextual Analysis and Partitioning of Covariance
Reproductive Conflicts and Levels of Selection in the Ant Pristomyrmex pungens: Contextual Analysis and Partitioning of Covariance
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蚂蚁 Pristomyrmex pungens 的生殖冲突和选择水平：上下文分析和协方差划分
DOI：
10.1086/285816
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
K. Tsuji
中科院分区：
文献类型：
--
作者：
K. Tsuji
通过上下文分析和协方差划分，研究了蚁蚁Pristomyrmex pungens个体和群体水平特征的表型选择。Pristomyrmex pungens有一个特殊的社会制度，其中没有女王和工人单性生殖。所有的工蜂都可以繁殖，并且在这个物种中只能活一年。因此，年菌落生长率衡量的是个体一生的平均繁殖成功率。根据个体卵巢发育情况估计了繁殖活动的群体内个体差异，并揭示了对工人二型性的冲突选择。大型工人零星地发现在一些殖民地和殖民地内的水平上有较高的健身。然而，大型工人减少了殖民地的健身在殖民地之间的水平。因此，大工蜂可能作为社会寄生表型存在。稳定和积极的定向选择觅食的比例似乎是负责在这个物种的合作育种的进化维持。繁殖但从不觅食的作弊者将被群体级选择淘汰。总体而言，定向选择有利于较小的菌落大小。群体水平的适应是重要的，因为群体基础的模式，裂变，可能会提高加性遗传变异的殖民地和创造机会的遗传反应，以殖民地水平的选择。
Phenotypic selection on individual- and colony-level characters was examined in the myrmicine ant Pristomyrmex pungens by contextual analysis and partitioning of covariance. Pristomyrmex pungens has an extraordinary social system in which there are no queens and workers reproduce parthenogenetically. All workers can be reproductive and live only one year in this species. Thus, the annual colony growth rate measures the mean individual lifetime reproductive success. Within-colony individual variation in reproductive activity was estimated from individual ovarian development and revealed conflicting selection on worker dimorphism. Large workers are sporadically found in some colonies and had higher fitness on a within-colony level. However, large workers reduced a colony's fitness at the between-colony level. Therefore, large workers probably exist as a socially parasitic phenotype. Stabilizing and positive directional selection on the proportion of foragers appeared to be responsible for the evolutionary maintenance of cooperative breeding in this species. Cheaters that reproduce but never forage will be eliminated by colony-level selection. Overall, directional selection favored smaller colony size. Colony-level adaptation is important, because the mode of colony foundation, fission, is likely to enhance additive genetic variance of colonies and create the opportunity for a genetic response to colony-level selection.