Colony structure of a slavemaking ant. I. Intracolony relatedness, worker reproduction, and polydomy
Colony structure of a slavemaking ant. I. Intracolony relatedness, worker reproduction, and polydomy
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DOI：
10.1111/j.0014-3820.2001.tb01295.x
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发表时间：
2001-02-01
期刊：
影响因子：
3.3
通讯作者：
Herbers, JM
中科院分区：
文献类型：
--
作者：
Foitzik, S;Herbers, JM
利用4个核微卫星位点和线粒体DNA （mtDNA）标记分析了专性奴隶蚂蚁美洲原蚁（Protomognathus americanus）的群体结构和种群结构。美洲瓢虫的群落通常只有一个蜂后，这里我们可以看到她是单次授精的。筑巢的员工一般都是亲姐妹，他们的亲缘关系不会偏离0.75的期望值。尽管蜂群是严格的一夫一妻制，但我们可以推断，有亲缘关系的蜂王接管蜂群是很常见的，而由无亲缘关系的蜂王取代蜂王的情况很少见。一夫多妻制很普遍，相邻的巢穴具有相同的基因组成。虽然我们没有从核标记中发现群体黏性或近交的证据，但mtDNA标记提供了小规模遗传结构的证据。单倍型结构和相关蜂王的接管表明新交配的蜂王的哲学。在这个物种中，工蜂在有蚁后和无蚁后的巢穴中繁殖，工蜂的繁殖占所有雄性的70%以上。尽管性别比例理论指出，造奴蚁是研究工蜂与蚁后冲突的重要系统，但我们的研究结果表明，美洲亚种中没有这种冲突的基础，因为大量的工蜂繁殖导致了亲缘关系值的变化。相反，独立的一夫多妻制巢单元和蚁后之间的局部资源竞争的双重影响导致了该物种的雄性偏倚分配比例。
Colony and population structure of the obligate slavemaker ant Protomognathus americanus was analyzed via four nuclear microsatellite loci and mitochondrial DNA (mtDNA) markers. Colonies of P. americanus usually contain a single queen, and here we show that she is singly inseminated. Nestmate workers are generally full sisters and their relatedness does not deviate from the expected value of 0.75. Even though colonies were strictly monogynous, we were able to infer that colony takeover by related queens was common and queen replacement by unrelated queens was rare. Polydomy is widespread, with neighboring nests having the same genetic composition. Although we found no evidence of population viscosity or inbreeding from nuclear markers, mtDNA markers provided evidence for small-scale genetic structuring. Haplotype structuring and takeover by related queens suggest philopatry of newly mated queens. In this species, workers reproduce in queenright and queenless nests and worker reproduction accounts for more than 70% of all males. Although sex-ratio theory points to slavemaking ants as important systems for studying queen-worker conflict, our results indicate no basis for such conflict in P. americanus, because extensive worker reproduction generates shifts in relatedness values. Rather, the dual effects of independent polydomous nest units and local resource competition among queens produce male-biased allocation ratios in this species.