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首页> 外文期刊>Ecological Modelling >What stops the 'diploid male vortex'?-A simulation study for species with single locus complementary sex determination
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What stops the 'diploid male vortex'?-A simulation study for species with single locus complementary sex determination

机译：什么阻止了“二倍体雄性涡旋”？-对具有单基因座互补性决定的物种的模拟研究

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摘要

The survival of hymenopteran populations especially that of ecologically and economically important pollinators and parasitoids, has become a major topic for empirical and theoretical studies. Complementary sex determination (CSD) in Hymenoptera may impose a substantial genetic load through the production of inviable or sterile diploid males. Modelling and laboratory studies have indicated that this genetic load may trigger a 'diploid male vortex' leading to rapid extinction of populations. Here we take a broader theoretical approach to analyze why populations exhibiting CSD persist in nature, even if they contain large proportions of homozygous diploid individuals. Using an individual-based model of spatially structured hymenopteran populations, we show that (i) inviability or reduced fertility of homozygous individuals, (ii) female-biased sex ratio, and (iii) strong intra-specific competition can mitigate the negative influence of CSD on population persistence and that (iv) already extremely low dispersal rates will result in long term survival. These findings underline the importance of life history traits for population survival and demonstrate that rather specific conditions must be met to initiate the 'diploid male vortex'.
机译：膜翅目种群的生存，特别是在生态和经济上重要的传粉媒介和寄生生物的生存，已成为经验和理论研究的主要课题。膜翅目中的互补性别决定（CSD）可能通过产生不能繁殖或不育的二倍体雄性而产生大量遗传负担。建模和实验室研究表明，这种遗传负荷可能会引发“二倍体雄性涡旋”，从而导致种群迅速灭绝。在这里，我们采用一种更广泛的理论方法来分析为什么表现出CSD的种群即使在其中包含大量纯合二倍体个体的情况下仍在自然中持久存在。使用基于个体的空间结构膜翅目种群的模型，我们显示（i）纯合个体的生存力或降低的生育力，（ii）女性偏向的性别比，以及（iii）强烈的种内竞争可以减轻关于人口持久性的可持续发展委员会，以及（iv）已经非常低的分散率将导致长期生存。这些发现强调了生活史特征对于人口生存的重要性，并表明必须满足相当特殊的条件才能引发“二倍体雄性涡旋”。

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