Triploid bumblebees indicate a direct cost of inbreeding in fragmented populations
Triploid bumblebees indicate a direct cost of inbreeding in fragmented populations
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DOI：
10.1111/j.1365-294x.2012.05679.x
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发表时间：
2012-08-01
影响因子：
4.9
通讯作者：
Goulson, D.
中科院分区：
文献类型：
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作者：
Darvill, B.;Lepais, O.;Goulson, D.
具有单基因座互补性性别决定（sl-CSD）的翅目物种由于性别决定基因座的多样性丧失而面临额外的近亲繁殖成本。实验室研究发现，一小部分二倍体雄性会产生可存活的二倍体精子，如果这些雄性交配，那么所产生的雌性会产生不育的三倍体后代。在这里，我们使用微卫星标记，以确定在一个模型岛系统中的三倍体个体的频率的熊蜂muscorum和B。在这两个物种的种群中发现了三倍体。观察到的三倍体频率高达8%的检测，估计总频率达到20%的峰值与正常的二倍体工人。对于这两个物种，三倍体频率呈负相关，与人口规模的代理人，在小种群近亲繁殖提供了直接的证据。人口仅限于
Hymenopteran species with single-locus complimentary sex-determination (sl-CSD) face an additional cost of inbreeding because of a loss of diversity at the sex-determining locus. Laboratory studies of a range of Hymenoptera have found that a small percentage of diploid males produce viable diploid sperm, and that if these males mate, then the resultant females produce triploid offspring that are sterile. Here, we use microsatellite markers to determine the frequency of triploid individuals of Bombus muscorum and B.similar to jonellus in a model island system. Triploids were found in populations of both species. Observed triploid frequencies of up to 8% were detected, and estimated total frequencies peaked at 20% with respect to normal diploid workers. For both species, triploid frequency was negatively correlated with surrogates of population size, providing direct evidence for inbreeding in small populations. Populations limited to