Data from: History matters more when explaining genetic diversity within the context of the core-periphery hypothesis
Duncan, Sarah I., University of Alabama, Tuscaloosa
Crespi, Erica J., Washington State University
Mattheus, Nichole M., University of Alabama, Tuscaloosa
Rissler, Leslie J., National Science Foundation
Published Jul 13, 2015 on Dryad.
Cite this dataset
Duncan, Sarah I.; Crespi, Erica J.; Mattheus, Nichole M.; Rissler, Leslie J. (2015). Data from: History matters more when explaining genetic diversity within the context of the core-periphery hypothesis [Dataset]. Dryad. https://doi.org/10.5061/dryad.fp1k7
The core–periphery hypothesis (CPH) predicts that populations located at the periphery of a species' range should have lower levels of genetic variation than those at the centre of the range. However, most of the research on the CPH focuses on geographic distance and not on ecological distance, or uses categorical definitions of core and periphery to explain the distribution of genetic diversity. We use current climate data and historical climate data from the last glacial maxima to develop quantitative estimates of contemporary and historical ecological suitability using ecological niche models. We analysed genetic diversity using 12 polymorphic microsatellites to estimate changes in heterozygosity, allelic richness and population differentiation in 31 populations of the wood frog (Lithobates sylvaticus) spanning the species’ entire eastern clade (33o to 45o latitude) from Alabama, USA, to Nova Scotia, Canada. Our data support predictions based on the CPH. Populations showed significant differences in genetic diversity across the range, with lower levels of genetic variation at the geographic range edge and in areas with lower levels of historical and contemporary ecological suitability. However, history and geography (not current ecological suitability) best explain the patterns. This study highlights the importance of examining more than just geography when assessing the CPH, and the importance of historical ecological suitability in the maintenance of genetic diversity and population differentiation.
BioClim 30s clipped
BioClim 19 climate variables plus altitude clipped to United States and Canada.
BioClim 2.5 clipped
Bioclim 2.5 arc minute WorlClim layers clipped to the United States and Canada.
Paleo 2.5 clipped
Paleo-climate layers from WorldClim clipped to the United States and Canada.
484 occurrence points downloaded from public databases, HerpNet and GBIF
Occurrence data for wood frogs downloaded from public databases, HerpNet and GBIF.