NDLI: Landscape genetics and genetic structure of the southern torrent salamander, Rhyacotriton variegatus

Content Provider	Springer Nature Link
Author	Emel, Sarah L. Storfer, Andrew
Copyright Year	2014
Abstract	Landscape genetic methods can be used to identify the most effective conservation measures to maintain functional connectivity among populations. Analyses of habitat factors that facilitate or restrict gene flow are particularly useful for species with specific habitat requirements and low dispersal rates. Rhyacotriton variegatus is a salamander species with low desiccation tolerance and a restricted geographic range, limited to the Pacific Northwest. Thus, we predicted that genetic distance would be positively correlated with climate and landscape variables that increase risk of desiccation. Two genetic distance measures, pairwise FST and proportion of shared alleles (DPS), suggested that gene flow was low among 19 sampling localities (367 total individuals) and genetic structure was high overall (DPS = 0.636 ± 0.010, FST = 0.330 ± 0.011; mean ± SD). Using both least-cost path and Circuitscape models of landscape resistance, we found that low stream cover, low canopy cover, high heat-load index, and short frost-free period all restricted gene flow among populations. We suggest that the conservation status of this species be revisited given this evidence of high genetic structure within the species, the level of habitat fragmentation in their range, and their reliance on dense canopy cover for dispersal. Maintaining stream corridors with buffers of dense canopy cover may maximize connectivity despite the pressures of timber harvest and urbanization.
Starting Page	209
Ending Page	221
Page Count	13
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	16
Issue Number	1
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-09-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Landscape genetics Genetic structure Conservation Microsatellites Salamander Rhyacotriton variegatus Conservation Biology/Ecology Plant Sciences Animal Anatomy / Morphology / Histology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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