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DOI10.1111/ele.13831
Interplay of population size and environmental fluctuations: A new explanation for fitness cost rarity in asexuals
Yashraj Chavhan; Sarthak Malusare; Sutirth Dey
2021-06-18
发表期刊Ecology Letters
出版年2021
英文摘要

Theoretical models of ecological specialisation commonly assume that adaptation to one environment leads to fitness reductions (costs) in others. However, experiments often fail to detect such costs. We addressed this conundrum using experimental evolution with Escherichia coli in several constant and fluctuating environments at multiple population sizes. We found that in fluctuating environments, smaller populations paid significant costs, but larger ones avoided them altogether. Contrastingly, in constant environments, larger populations paid more costs than the smaller ones. Overall, large population sizes and fluctuating environments led to cost avoidance only when present together. Mutational frequency distributions obtained from whole-genome whole-population sequencing revealed that the primary mechanism of cost avoidance was the enrichment of multiple beneficial mutations within the same lineage. Since the conditions revealed by our study for avoiding costs are widespread, it provides a novel explanation of the conundrum of why the costs expected in theory are rarely detected in experiments.

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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/330711
专题资源环境科学
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Yashraj Chavhan,Sarthak Malusare,Sutirth Dey. Interplay of population size and environmental fluctuations: A new explanation for fitness cost rarity in asexuals[J]. Ecology Letters,2021.
APA Yashraj Chavhan,Sarthak Malusare,&Sutirth Dey.(2021).Interplay of population size and environmental fluctuations: A new explanation for fitness cost rarity in asexuals.Ecology Letters.
MLA Yashraj Chavhan,et al."Interplay of population size and environmental fluctuations: A new explanation for fitness cost rarity in asexuals".Ecology Letters (2021).
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