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The ability of Drosophila hybrids to locate food declines with parental divergence

机译:果蝇杂交种定位食物的能力随着家长分歧而下降

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Hybrids are generally less fit than their parental species, and the mechanisms underlying their fitness reductions can manifest through different traits. For example, hybrids can have physiological, behavioral, or ecological defects, and these defects can generate reproductive isolation between their parental species. However, the rate that mechanisms of postzygotic isolation other than hybrid sterility and inviability evolve has remained largely uninvestigated, despite isolated studies showing that behavioral defects in hybrids are not only possible but might be widespread. Here, we study a fundamental animal behavior—the ability of individuals to find food—and test the rate at which it breaks down in hybrids. We measured the ability of hybrids from 94 pairs of Drosophila species to find food and show that this ability decreases with increasing genetic divergence between the parental species and that male hybrids are more strongly (and negatively) affected than females. Our findings quantify the rate that hybrid dysfunction evolves across the diverse radiation of Drosophila and highlights the need for future investigations of the genetic and neurological mechanisms that affect a hybrid’s ability to find a suitable substrate on which to feed and breed.
机译:杂交种通常不如家长物种的适应性,并且它们的健身减少的机制可以通过不同的特征表现出来。例如,杂种可以具有生理,行为或生态缺陷,并且这些缺陷可以产生他们的家长之间的生殖隔离。然而,除杂种无菌和耐用性以外的突出性分离的机制的速率仍然在很大程度上是未取消的,尽管孤立的研究表明杂种中的行为缺陷不仅可能,但可能是普遍的。在这里,我们研究了一个基本的动物行为 - 个人寻找食物的能力 - 并测试其在杂交种中分解的速率。我们测量了杂交物从94对果蝇种类的能力,以寻找食物,并表明这种能力随着家长物种之间的遗传分歧而降低,并且雄性杂种比女性受到更强烈的(和负面)。我们的发现量化了杂种功能障碍在果蝇的不同辐射中发展的速率,并突出了对影响杂种能够找到合适的底物的遗传和神经机制的需求的需要。

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