Diversification rates increase with population size and resource concentration in an unstructured habitat.

Diversification rates increase with population size and resource concentration in an unstructured habitat. Research Abstract Details 

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Diversification rates increase with population size and resource concentration in an unstructured habitat. Abstract Text:

M H H Stevens,M Sanchez,J Lee,S E Finkel,M H H Stevens,M Sanchez,J Lee,S E Finkel,

Understanding the mechanisms controlling the generation and maintenance of biodiversity provides some of the planet's greatest and most pressing challenges. Variation in resource concentration, which varies widely at multiple scales, may cause biodiversity to increase, decrease, or exhibit a unimodal response and underlying mechanisms remain obscure. We established experimental cultures of long-term stationary phase (LTSP) Escherichia coli to test whether per capita heterozygosity varies with resource concentration, and, if so, whether population sizes associated with different resource concentrations contributed to these patterns. Our results provide the clearest example to date of increasing per capita heterozygosity with increasing resource concentration. Further, our experimental manipulations of population size, independent of resource concentration, provide the first unequivocal evidence that population size is one of the underlying factors controlling per capita heterozygosity along such resource gradients. Specifically, we show that cultures with higher maximum population sizes, associated with higher resource concentrations, have higher per capita heterozygosity. These experiments provide the first experimental evidence for an underappreciated factor controlling biodiversity along resource gradients-population size. This direct evidence of population size influencing diversification rates has implications for regional and global scale patterns of biodiversity.

Diversification rates increase with population size and resource concentration in an unstructured habitat. Publishing Authors By Initials

MH Stevens,M Sanchez,J Lee,SE Finkel,MH Stevens,M Sanchez,J Lee,SE Finkel,

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Diversification rates increase with population size and resource concentration in an unstructured habitat. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Genetics

VOLUME: 177

Page Numbers: 2243-50

Journal Abbreviation: Genetics

ISSN: 0016-6731

DAY: 12

MONTH: Dec

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: Molecular and Computational Biology Program, Department of Biological Sciences, University of Southern California, Los Angeles, California 90089-2910.

Country: United States

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MEDLINETA: Genetics

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