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• W3100900811 abstract "Aim Phylogeographic studies of temperate forest taxa often infer complex histories involving population subdivision into distinct refugia during the Last Glacial Maximum (LGM). However, temperate forests may have been broadly distributed in southeastern North America during the LGM. We investigate genome-wide genetic structure in two widespread eastern North America tree species to determine if range expansion from a contiguous area or from genetically isolated refugia better explains the postglacial history of trees and forests from this region. Location Eastern North America (ENA). Taxa Bitternut hickory ( Carya cordiformis (Wangenh.) K.Koch) and shagbark hickory ( Carya ovata (Mill.) K.Koch). Methods Genetic diversity and differentiation indices were calculated from >1,000 nuclear SNP loci genotyped in ca. 180 individuals per species sampled across ENA. Genetic structure was investigated using principle component analysis and genetic clustering algorithms. As an additional tool for inference, areas of suitable habitat during the LGM were predicted using species distribution models (SDMs). Results Populations across all latitudes showed similar levels of genetic diversity. Most genetic variation was weakly differentiated across ENA, with the exception of an outlier population of Carya ovata in Texas. Genetic structure in each species exhibited an isolation-by-distance pattern. SDMs predicted high LGM habitat suitability over much of the southeastern United States. Main conclusions Both hickory species likely survived the LGM in a large region of continuous habitat and recolonized northern areas in a single expanding front that encountered few migration barriers. More complex scenarios, such as forest refugia, need not be invoked to explain genetic structure. The genetically distinct Texas population of Carya ovata could represent a separate glacial refugium, but other explanations are possible. Relative to that of other temperate forest regions, the phylogeographic history of ENA may have been exceptionally simple, involving a northward range shift but without well defined refugia." @default.
• W3100900811 created "2020-11-23" @default.
• W3100900811 creator A5027368307 @default.
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• W3100900811 date "2017-10-18" @default.
• W3100900811 modified "2023-10-16" @default.
• W3100900811 title "Genomic evidence of a widespread southern distribution during the Last Glacial Maximum for two eastern North American hickory species" @default.
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• W3100900811 doi "https://doi.org/10.1101/205716" @default.
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