Age-specific fitness components in hybrid females of Drosophila pseudoobscura and D. persimilis.

Age-specific fitness components in hybrid females of Drosophila pseudoobscura and D. persimilis.
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假暗果蝇和小果蝇杂交雌性的年龄特异性健康成分。

DOI:
10.1093/jhered/92.1.30
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发表时间:
2001
期刊:
The Journal of heredity
影响因子:
--
通讯作者:
Arnold,ML
Arnold,ML
中科院分区:
--
文献类型:
--
作者:
Promislow,DE;Jung,CF;Arnold,ML

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大多数杂交模型都假定杂种比亲本分类群更不适合。相比之下,一些研究人员探索了一种可能性,即杂交个体实际上可能具有更高的适应性,因此在新物种的产生或适应中发挥了重要作用。通过年龄特异性适应度分量的估算,不仅可以确定杂种的适应度与亲本类群的差异,还可以确定杂种相对于亲本类群的适应度是否随年龄而变化。在这里,我们描述了两种果蝇的年龄特异性适应性特征的分析,D.伪果蝇和D.。persimilis和它们的f1杂交品种。在早期,杂交雌性产卵的数量与亲代个体一样多,但产生的后代要少得多。相比之下,到了晚年,亲本分类群的产量急剧下降,这在杂交种中是没有的,因此,杂种平均比亲本分类群产生更多的后代。此外,杂交种的卵-成虫存活率与卵密度呈负相关,而这些性状在亲本类群中仅呈弱相关。由于我们只分析了两种菌株,而且这两种菌株可能是部分近交的,结果多少受到了限制。尽管如此,研究结果确实具有说明意义,它不仅指出至少一些杂交个体可能与亲本分类群一样适合或更适合,而且还指出杂交个体与亲本分类群之间的差异随着年龄的变化而变化。
Most models of hybridization assume that hybrids are less fit than their parental taxa. In contrast, some researchers have explored the possibility that hybrid individuals may actually have higher fitness and so play an important role in the generation of new species or adaptations. By estimating age-specific fitness components, we can determine not only how hybrid fitness differs from parental taxa, but also whether the fitness of hybrids relative to parental taxa changes with age. Here we describe an analysis of age-specific fitness traits in two species ofDrosophila, D. pseudoobscuraandD. persimilis, and their F1hybrids. At early ages, hybrid females lay as many eggs as parental individuals, on average, but produce far fewer offspring. By late ages, in contrast, parental taxa show a steep decline in production not seen in hybrids, such that hybrids produce more offspring, on average, than parental taxa. Furthermore, egg-adult survival in hybrids is negatively correlated with egg density, whereas these traits are only weakly correlated in parental taxa. The results are limited somewhat by the fact that we analyze only two strains, and that these may be partially inbred. Nonetheless, the results are certainly illustrative, pointing out not only that at least some hybrid individuals may be as fit or fitter than parental taxa, but also that the difference between hybrids and parental taxa varies with age.
DOI: 10.1093/genetics/143.2.839
发表时间: 1996
期刊: Genetics
影响因子: 3.3
作者:
Promislow,DE;Tatar,M;Khazaeli,AA;Curtsinger,JW
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DOI: --
发表时间: 1995
期刊: Genetics
影响因子: 3.3
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影响因子: 11.1
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发表时间: 1949
期刊: Physiological Zoology
影响因子: --
作者:
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发表时间: 1987
期刊: Genetics
影响因子: 3.3
作者:
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