Life history variation in an artificially selected population of Drosophila melanogaster: pleiotropy, superflies, and age-specific adaptation.

Life history variation in an artificially selected population of Drosophila melanogaster: pleiotropy, superflies, and age-specific adaptation.
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人工选择的黑腹果蝇种群的生活史变异:多效性、超级苍蝇和年龄特异性适应。

DOI:
10.1111/j.1558-5646.2010.01139.x
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发表时间:
2010
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Curtsinger,JamesW
Curtsinger,JamesW
中科院分区:
--
文献类型:
--
作者:
Khazaeli,AzizA;Curtsinger,JamesW

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我们测量了黑腹果蝇重组自交系的年龄特异性繁殖力和存活率,这些自交系是通过延迟繁殖的人工选择实验获得的。产卵高峰年龄具有高度遗传性(h2B= 0.55)。我们发现三个定性类别的高峰产卵:早期,中年,和双峰。寿命与早期繁殖力的遗传相关性与零之间无显著差异,但与中年繁殖力的遗传相关性为正相关且具有统计学意义。长寿基因型表现出中年生育高峰。没有证据表明生殖努力从早期到后期发生了转变。质量重组表型的存在,包括“超级果蝇”,表现出更高的存活率和高水平的早期繁殖力,反驳了果蝇的生活史进化由负多效性主导的普遍观点。有明确的证据表明,在产卵时间上存在年龄特异性适应。
We measured age-specific fecundity and survival in recombinant inbred lines ofDrosophila melanogasterthat were derived from an artificial selection experiment for delayed reproduction. Age at peak oviposition is highly heritable (h2B= 0.55). We find three qualitative categories of peak oviposition: early-, midlife-, and bimodal. Genetic correlations between life span and early fecundity are not significantly different from zero, but correlations with midlife fecundity are positive and statistically significant. Long-lived genotypes exhibit a midlife fecundity peak. There is no evidence for a shift of reproductive effort from early to later stages. The existence of qualitatively recombinant phenotypes, including “superflies” that exhibit both enhanced survival and high levels of early fecundity, argues against the widespread idea that life history evolution inDrosophilais dominated by negative pleiotropy. There is clear evidence of age-specific adaptation in the timing of oviposition.
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