Sexual selection and the evolution of condition-dependence: an experimental test at two resource levels.

Sexual selection and the evolution of condition-dependence: an experimental test at two resource levels.
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性选择和条件依赖性的进化:两个资源水平的实验测试。

DOI:
10.1093/evolut/qpac066
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发表时间:
2023
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Bath E
Bath E
中科院分区:
--
文献类型:
--
作者:
Bath E

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性选择特征中更强的条件依赖性是有据可查的,但这种关系是如何建立的仍然未知。此外,资源的可获得性可以塑造性选择的反应,但资源对性选择和条件依赖之间的关系的影响也是未知的。在这项研究中,我们直接测试的假设,性选择驱动进化的较强的条件依赖性和资源的可用性影响的结果,进化果蝇(果蝇)相对较强或较弱的性选择(通过不同的性别比例)和资源贫乏或资源丰富的成人饮食。然后,我们通过发育饮食实验操纵条件,并评估成年形态,行为和繁殖的条件依赖性。我们观察到更强的条件依赖于女性的大小在男性偏向的人口和女性卵巢管生产资源有限的人口。然而,我们没有发现任何证据表明,男性的条件依赖性增加性选择的反应,或反应取决于资源水平。这些结果提供了没有支持的假设,性选择增加男性条件依赖性或性选择的影响条件依赖性的影响是由资源的可用性。据我们所知,我们的研究是对这些假设的第一次实验测试。如果我们报告的结果是一般性的,那么性选择对条件依赖进化的影响可能没有预测的那么重要。
Stronger condition-dependence in sexually selected traits is well-documented, but how this relationship is established remains unknown. Moreover, resource availability can shape responses to sexual selection, but resource effects on the relationship between sexual selection and condition-dependence are also unknown. In this study, we directly test the hypotheses that sexual selection drives the evolution of stronger-condition-dependence and that resource availability affects the outcome, by evolving fruit flies (Drosophila melanogaster) under relatively strong or weak sexual selection (through varied sex ratios) and at resource-poor or resource-rich adult diets. We then experimentally manipulated condition via developmental diet and assessed condition-dependence in adult morphology, behavior, and reproduction. We observed stronger condition-dependence in female size in male-biased populations and in female ovariole production in resource-limited populations. However, we found no evidence that male condition-dependence increased in response to sexual selection, or that responses depended on resource levels. These results offer no support for the hypotheses that sexual selection increases male condition-dependence or that sexual selection’s influence on condition-dependence is influenced by resource availability. Our study is, to our knowledge, the first experimental test of these hypotheses. If the results we report are general, then sexual selection’s influence on the evolution of condition-dependence may be less important than predicted.
DOI: --
发表时间: 1991
期刊: Evolution; international journal of organic evolution
影响因子: --
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