Experimental evolution reveals trade-offs between sexual selection and heat tolerance in Drosophila prolongata.

IF 3.1 2区 环境科学与生态学 Q2 ECOLOGY
Evolution Pub Date : 2025-02-18 DOI:10.1093/evolut/qpaf035
Alessio N De Nardo, Abhishek Meena, Komal Maggu, Benjamin Eggs, Sonja H Sbilordo, Stefan Lüpold
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引用次数: 0

Abstract

Sexual selection promotes traits that enhance mating or fertilization success, but these traits can be very costly under harsh environmental conditions. The extent to which differential investment in costly traits under varying intensities of sexual selection is related to their susceptibility to environmental stress remains unclear. This study explored how experimental evolution under different operational sex ratios (OSRs) shapes traits and reproductive success of male Drosophila prolongata, and how developmental and/or adult heat stress affect the expression of these traits. We found males from even and slightly male-biased OSRs to be larger and display greater reduction in body size under developmental heat stress, suggesting pre-mating sexual selection on body size and condition-dependent thermal sensitivity. These populations also exhibited consistently high mating and fertilization success across temperatures, potentially indicating selection for robust phenotypes with 'good genes' that perform well regardless of temperature. Conversely, males from strongly male-biased OSR populations experienced more pronounced decline in sperm competitiveness following exposure to developmental or adult heat stress. These results highlight how environmental stressors differentially impact populations, shaped by varying strengths of pre- and post-mating sexual selection. These observed patterns suggest potential interactions between past selection and the ability to adapt to changing environments.

实验进化揭示了长果蝇的性选择和耐热性之间的权衡。
性选择促进了提高交配或受精成功率的特征,但在恶劣的环境条件下,这些特征可能代价高昂。在不同的性选择强度下,对昂贵性状的差异投资在多大程度上与它们对环境压力的易感性有关,目前尚不清楚。本研究探讨了不同工作性别比(OSRs)下的实验进化如何塑造雄性长果蝇(Drosophila prolongata)的性状和繁殖成功,以及发育和/或成虫热应激如何影响这些性状的表达。我们发现,在发育性热应激条件下,来自均匀和轻度雄性偏倚的osr的雄性体型更大,体型缩小幅度更大,这表明交配前的性选择基于体型和条件依赖的热敏性。这些种群在不同温度下也表现出一贯的高交配和受精成功率,这可能表明,无论温度如何,“好基因”都具有良好的表型选择。相反,来自强烈男性偏见的OSR群体的男性在暴露于发育期或成年期热应激后,精子竞争力的下降更为明显。这些结果强调了环境压力因素对种群的不同影响,这些影响是由交配前和交配后性选择的不同强度形成的。这些观察到的模式表明,过去的选择与适应不断变化的环境的能力之间存在潜在的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Evolution
Evolution 环境科学-进化生物学
CiteScore
5.00
自引率
9.10%
发文量
0
审稿时长
3-6 weeks
期刊介绍: Evolution, published for the Society for the Study of Evolution, is the premier publication devoted to the study of organic evolution and the integration of the various fields of science concerned with evolution. The journal presents significant and original results that extend our understanding of evolutionary phenomena and processes.
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