Emanuel M Fonseca, Tara A Pelletier, Sydney K Decker, Danielle J Parsons, Bryan C Carstens
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引用次数: 1
Abstract
Intraspecific genetic diversity is a key aspect of biodiversity. Quaternary climatic change and glaciation influenced intraspecific genetic diversity by promoting range shifts and population size change. However, the extent to which glaciation affected genetic diversity on a global scale is not well established. Here we quantify nucleotide diversity, a common metric of intraspecific genetic diversity, in more than 38,000 plant and animal species using georeferenced DNA sequences from millions of samples. Results demonstrate that tropical species contain significantly more intraspecific genetic diversity than nontropical species. To explore potential evolutionary processes that may have contributed to this pattern, we calculated summary statistics that measure population demographic change and detected significant correlations between these statistics and latitude. We find that nontropical species are more likely to deviate from neutral expectations, indicating that they have historically experienced dramatic fluctuations in population size likely associated with Pleistocene glacial cycles. By analyzing the most comprehensive data set to date, our results imply that Quaternary climate perturbations may be more important as a process driving the latitudinal gradient in species richness than previously appreciated.
期刊介绍:
Evolution Letters publishes cutting-edge new research in all areas of Evolutionary Biology.
Available exclusively online, and entirely open access, Evolution Letters consists of Letters - original pieces of research which form the bulk of papers - and Comments and Opinion - a forum for highlighting timely new research ideas for the evolutionary community.