Diversity and biogeographical patterns of yeast communities in Antarctic,Patagonian and tropical lakes |
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| Institution: | 1. Department of Microbiology, The University of Tennessee, Knoxville, TN 37996, USA;2. Watershed Hydrology and Ecology Research Division, Environment and Climate Change Canada (ECCC), 867 Lakeshore Rd Burlington ON L7S 1A1, Canada;3. Biosystem Engineering and Soil Sciences, The University of Tennessee, Knoxville, TN, 37996, USA;4. Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, New York 13210, USA;1. Institute of Microbiology Paulo de Góes, Health Science Center, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Department of Environmental Engineering, Midwestern State University, Paraná, Brazil;3. Institute of Biology, Department of Chemistry-Biology, Faculty of Science and Technology, University of Siegen, Germany |
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| Abstract: | We investigated the distribution patterns of yeast communities in freshwater lakes along a latitudinal gradient in order to evaluate yeast biogeography at intercontinental (501–8000 km), regional (0–500 km) and local (0–1 km) geographical scales. We identified 285 yeast isolates belonging to 64 species based on sequence analysis of the ITS-5.8S region and the D1/D2 domains of the large subunit of rRNA genes. Distance decay analysis showed a significant negative slope curve at the intercontinental scale. At the intercontinental and regional scales, the dissimilarity of the yeast communities was correlated with geographical distance, with community similarity decreasing with increasing distance. The physiological profiles of the yeast communities from tropical and Patagonian lakes were similar but were different from those of Antarctic lakes. This is the first report of latitudinal patterns of lake yeast diversity along a gradient extending from Antarctic to tropical environments. |
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| Keywords: | Biogeography Distance decay Diversity Freshwater Yeasts |
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