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- W2997479276 abstract "Premise Patterns of genetic structure across a species’ range reflect the long‐term interplay between genetic drift, gene flow, and selection. Given the importance of gene flow in preventing the loss of diversity through genetic drift among spatially isolated populations, understanding the dynamics of gene flow and the factors that influence connectivity across a species’ range is a major goal for conservation of genetic diversity. Here we present a detailed look at gene flow dynamics of Sequoiadendron giganteum , a paleoendemic tree species that will likely face numerous threats due to climate change. Methods We used microsatellite markers to examine nineteen populations of S. giganteum for patterns of genetic structure and to estimate admixture and rates of gene flow between eight population pairs. Also, we used Generalized Dissimilarity Models to elucidate landscape factors that shape genetic differentiation among populations. Results We found minimal gene flow between adjacent groves in the northern disjunct range. In most of the southern portion of the range, groves showed a signal of connectivity which degrades to isolation in the extreme south. Geographic distance was the most important predictor of genetic dissimilarity across the range, with environmental conditions related to precipitation and temperature explaining a small, but significant, portion of the genetic variance. Conclusions Due to their isolation and unique genetic composition, northern populations of S. giganteum should be considered a high conservation priority. In this region, we suggest germplasm conservation as well as restoration planting to enhance genetic diversity." @default.
- W2997479276 created "2020-01-10" @default.
- W2997479276 creator A5014284633 @default.
- W2997479276 creator A5018178911 @default.
- W2997479276 date "2019-12-27" @default.
- W2997479276 modified "2023-10-10" @default.
- W2997479276 title "Fragmented and isolated: limited gene flow coupled with weak isolation by environment in the paleoendemic giant sequoia (<i>Sequoiadendron giganteum</i>)" @default.
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- W2997479276 doi "https://doi.org/10.1002/ajb2.1406" @default.
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