期刊
GENOME BIOLOGY AND EVOLUTION
卷 7, 期 8, 页码 2344-2351出版社
OXFORD UNIV PRESS
DOI: 10.1093/gbe/evv148
关键词
individual-based model; prokaryotic genome; extinction; evolvability; global change; genome size optimization
资金
- Lord Zuckerman Phd studentship (UEA)
- NERC [NE/K004530/1]
- School of Environmental Sciences, University of East Anglia
- NERC [NE/K004530/1] Funding Source: UKRI
- Natural Environment Research Council [NE/K004530/1] Funding Source: researchfish
Temporal variability in ecosystems significantly impacts species diversity and ecosystem productivity and therefore the evolution of organisms. Different levels of environmental perturbations such as seasonal fluctuations, natural disasters, and global change have different impacts on organisms and therefore their ability to acclimatize and adapt. Thus, to understand how organisms evolve under different perturbations is a key for predicting how environmental change will impact species diversity and ecosystem productivity. Here, we developed a computer simulation utilizing the individual-based model approach to investigate genome size evolution of a haploid, clonal and free-living prokaryotic population across different levels of environmental perturbations. Our results show that a greater variability of the environment resulted in genomes with a larger number of genes. Environmental perturbations were more effectively buffered by populations of individuals with relatively large genomes. Unpredictable changes of the environment led to a series of population bottlenecks followed by adaptive radiations. Our model shows that the evolution of genome size is indirectly driven by the temporal variability of the environment. This complements the effects of natural selection directly acting on genome optimization. Furthermore, species that have evolved in relatively stable environments may face the greatest risk of extinction under global change as genome streamlining genetically constrains their ability to acclimatize to the new environmental conditions, unless mechanisms of genetic diversification such as horizontal gene transfer will enrich their gene pool and therefore their potential to adapt.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据