气候变化领域集成服务门户(CCPortal): Evidence for environmental and ecological selection in a microbe with no geographic limits to gene flow

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DOI	10.1073/pnas.1612346114
	Evidence for environmental and ecological selection in a microbe with no geographic limits to gene flow
	Whittaker K.A.; Rynearson T.A.
发表日期	2017
ISSN	0027-8424
起始页码	2651
结束页码	2656
卷号	114 期号:10
英文摘要	The ability for organisms to disperse throughout their environment is thought to strongly influence population structure and thus evolution of diversity within species. A decades-long debate surrounds processes that generate and support high microbial diversity, particularly in the ocean. The debate concerns whether diversification occurs primarily through geographic partitioning (where distance limits gene flow) or through environmental selection, and remains unresolved due to lack of empirical data. Here we show that gene flow in a diatom, an ecologically important eukaryotic microbe, is not limited by global-scale geographic distance. Instead, environmental and ecological selection likely play a more significant role than dispersal in generating and maintaining diversity. We detected significantly diverged populations (FST > 0.130) and discovered temporal genetic variability at a single site that was on par with spatial genetic variability observed over distances of 15,000 km. Relatedness among populations was decoupled from geographic distance across the global ocean and instead, correlated significantly with water temperature and whole-community chlorophyll a. Correlations with temperature point to the importance of environmental selection in structuring populations. Correlations with whole-community chlorophyll a, a proxy for autotrophic biomass, suggest that ecological selection via interactions with other plankton may generate and maintain population genetic structure in marine microbes despite globalscale dispersal. Here, we provide empirical evidence for global gene flow in a marine eukaryotic microbe, suggesting that everything holds the potential to be everywhere, with environmental and ecological selection rather than geography or dispersal dictating the structure and evolution of diversity over space and time. © 2017, National Academy of Sciences. All rights reserved.
英文关键词	Diatom; Dispersal; Environmental selection; Microsatellites; Population structure
语种	英语
scopus关键词	chlorophyll a; chlorophyll; chlorophyll a; Article; ecology; environment; gene flow; genetic distance; genetic variability; genetic variation; microorganism; natural selection; nonhuman; population structure; priority journal; water temperature; gene flow; genetic selection; genetic variation; genetics; geography; growth, development and aging; plankton; population genetics; Chlorophyll; Ecology; Gene Flow; Genetic Variation; Genetics, Population; Geography; Plankton; Selection, Genetic
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160660
作者单位	Whittaker, K.A., Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882, United States, Biology Department, Bates College, Lewiston, ME 04240, United States; Rynearson, T.A., Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882, United States
推荐引用方式 GB/T 7714	Whittaker K.A.,Rynearson T.A.. Evidence for environmental and ecological selection in a microbe with no geographic limits to gene flow[J],2017,114(10).
APA	Whittaker K.A.,&Rynearson T.A..(2017).Evidence for environmental and ecological selection in a microbe with no geographic limits to gene flow.Proceedings of the National Academy of Sciences of the United States of America,114(10).
MLA	Whittaker K.A.,et al."Evidence for environmental and ecological selection in a microbe with no geographic limits to gene flow".Proceedings of the National Academy of Sciences of the United States of America 114.10(2017).