Sex determination and inbreeding depression in an ant with regular sib-mating
Sex determination and inbreeding depression in an ant with regular sib-mating
复制标题
定期进行同胞交配的蚂蚁的性别决定和近交抑制
DOI：
10.1038/sj.hdy.6800846
复制
发表时间：
2006
期刊：
影响因子：
3.8
通讯作者：
J. Heinze
中科院分区：
文献类型：
--
作者：
A. Schrempf;Serge Aron;J. Heinze
单倍性是动物性别决定的最普遍机制之一。在许多Hyattera，包括所有迄今为止调查的社会物种，二倍体个体，这是杂合的性位点，发展为女性，而单倍体，半合子个体发展为男性（单基因座互补性决定，s1-CSD）。近亲繁殖导致性位点的纯合性，导致产生二倍体雄性，其通常是不育的，并构成相当大的健身成本。然而，定期近亲繁殖没有二倍体雄性生产是已知的几个孤独的黄蜂，这表明在这些物种的性别是不是由SL-CSD，但替代机制。在这里，我们研究的性别决定在一个蚂蚁与定期近亲繁殖，暗蚁。几乎完全没有二倍体男性后，10代的兄弟姐妹交配在实验室文件中的第一次，没有sl-CSD和CSD与两个或几个不连锁的性位点在一个物种的社会Hyattera。皇后，与兄弟交配，似乎减少了男性在他们的育雏，预期从近亲繁殖的关系。与此相反，一些殖民地开始出现近亲繁殖萧条的迹象后，几代的同胞交配，如缩短女王寿命，较高的育雏死亡率，并在一些殖民地转向更男性偏见的性别比例，大概是由于较低的精子授精能力。
Haplodiploidy is one of the most widespread mechanisms of sex determination in animals. In many Hymenoptera, including all hitherto investigated social species, diploid individuals, which are heterozygous at the sex locus, develop as females, whereas haploid, hemizygous individuals develop as males (single-locus complementary sex determination, sl-CSD). Inbreeding leads to homozygosity at the sex locus, resulting in the production of diploid males, which are usually sterile and constitute a considerable fitness cost. Nevertheless, regular inbreeding without diploid male production is known from several solitary wasps, suggesting that in these species sex is not determined by sl-CSD but alternative mechanisms. Here, we examine sex determination in an ant with regular inbreeding, Cardiocondyla obscurior. The almost complete absence of diploid males after 10 generations of brother–sister mating in the laboratory documents for the first time the absence of sl-CSD and CSD with two or a few unlinked sex loci in a species of social Hymenoptera. Queens, which mated with a brother, appeared to decrease the number of males in their brood, as expected from the relatedness relationships under inbreeding. In contrast, some colonies began to show signs of an inbreeding depression after several generations of sib-mating, such as shortened queen life span, higher brood mortality, and a shift to more male-biased sex ratios in some colonies, presumably due to lower insemination capability of sperm.