Asexual reproduction in introduced and native populations of the ant Cerapachys biroi
Asexual reproduction in introduced and native populations of the ant Cerapachys biroi
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DOI：
10.1111/mec.12041
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发表时间：
2012-11-01
影响因子：
4.9
通讯作者：
Keller, Laurent
中科院分区：
文献类型：
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作者：
Kronauer, Daniel J. C.;Pierce, Naomi E.;Keller, Laurent
无性繁殖在引进物种中特别常见，可能是因为它有助于克服殖民期间与低人口密度相关的负面影响。自上个世纪初以来，Cerapachys biroi蚂蚁已被引入世界各地的热带和亚热带岛屿。在这个物种中，工蜂可以通过孤雌生殖进行繁殖。在这里，我们使用遗传标记来重建的历史的人为引进的C.biroi，并解决在引进和本地人口的女性孤雌生殖的流行。我们表明，至少有四个遗传上不同的谱系已从亚洲大陆引进，并导致该物种的环热带建立。我们的分析表明，无性繁殖占主导地位的引进范围，也是常见的原生范围。鉴于C.biroi是唯一一种成功地在其本土范围外建立的dorylomorph蚂蚁，这种不寻常的繁殖模式可能促进了该物种在世界范围内的传播。另一方面，在引入的范围内很少出现单倍体雄性和至少一个明确的有性重组案例表明，C.biroi并没有失去有性的潜力。最后，我们表明，thelytoky在C.biroi可能有一个遗传，而不是感染的起源，并与中央融合的自融合是最有可能的潜在的细胞学机制。这与已知的其他thelytokous eusocialHyplitera一致。
Asexual reproduction is particularly common among introduced species, probably because it helps to overcome the negative effects associated with low population densities during colonization. The ant Cerapachys biroi has been introduced to tropical and subtropical islands around the world since the beginning of the last century. In this species, workers can reproduce via thelytokous parthenogenesis. Here, we use genetic markers to reconstruct the history of anthropogenic introductions of C.biroi, and to address the prevalence of female parthenogenesis in introduced and native populations. We show that at least four genetically distinct lineages have been introduced from continental Asia and have led to the species' circumtropical establishment. Our analyses demonstrate that asexual reproduction dominates in the introduced range and is also common in the native range. Given that C.biroi is the only dorylomorph ant that has successfully become established outside of its native range, this unusual mode of reproduction probably facilitated the species' worldwide spread. On the other hand, the rare occurrence of haploid males and at least one clear case of sexual recombination in the introduced range show that C.biroi has not lost the potential for sex. Finally, we show that thelytoky in C.biroi probably has a genetic rather than an infectious origin, and that automixis with central fusion is the most likely underlying cytological mechanism. This is in accordance with what is known for other thelytokous eusocial Hymenoptera.