Latitude delineates patterns of biogeography in terrestrialStreptomyces
Autor: | James R. Doroghazi, Mallory J. Choudoir, Daniel H. Buckley |
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Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
education.field_of_study Ecology Biogeography 030106 microbiology Population Biodiversity Population genetics 15. Life on land Biology Microbiology Nucleotide diversity 03 medical and health sciences Phylogeography 030104 developmental biology Spatial ecology Biological dispersal education human activities Ecology Evolution Behavior and Systematics |
Zdroj: | Environmental Microbiology. 18:4931-4945 |
ISSN: | 1462-2912 |
Popis: | The biogeography of Streptomyces was examined at regional spatial scales to identify factors that govern patterns of microbial diversity. Streptomyces are spore forming filamentous bacteria which are widespread in soil. Streptomyces strains were isolated from perennial grass habitats sampled across a spatial scale of more than 6000 km. Previous analysis of this geographically explicit culture collection provided evidence for a latitudinal diversity gradient in Streptomyces species. Here the hypothesis that this latitudinal diversity gradient is a result of evolutionary dynamics associated with historical demographic processes was evaluated. Historical demographic phenomena have genetic consequences that can be evaluated through analysis of population genetics. Population genetic approaches were applied to analyze population structure in six of the most numerically abundant and geographically widespread Streptomyces phylogroups from our culture collection. Streptomyces population structure varied at regional spatial scales, and allelic diversity correlated with geographic distance. In addition, allelic diversity and gene flow are partitioned by latitude. Finally, it was found that nucleotide diversity within phylogroups was negatively correlated with latitude. These results indicate that phylogroup diversification is constrained by dispersal limitation at regional spatial scales, and they are consistent with the hypothesis that historical demographic processes have influenced the contemporary biogeography of Streptomyces. |
Databáze: | OpenAIRE |
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