NDLI: Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

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Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

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Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

Content Provider	Springer Nature Link
Author	Potter, Kevin M. Jetton, Robert M. Dvorak, William S. Hipkins, Valerie D. Rhea, Rusty Whittier, W. Andrew
Copyright Year	2011
Abstract	Eastern hemlock (Tsuga canadensis [L.] Carr.) is an ecologically important tree species experiencing severe mortality across much of its eastern North American distribution, caused by infestation of the exotic hemlock woolly adelgid (Adelges tsugae Annand). To guide gene conservation strategies for this imperiled conifer, we conducted a range-wide genetic variation study for eastern hemlock, amplifying 13 highly polymorphic nuclear microsatellite loci in 1,180 trees across 60 populations. The results demonstrate that eastern hemlock exhibits moderate inbreeding, possibly a signature of a prehistoric decline associated with a widespread insect outbreak. Contrary to expectations, populations in formerly glaciated regions are not less genetically diverse than in the putative southern refugial region. As expected, peripheral disjunct populations are less genetically diverse than main-range populations, but some are highly genetically differentiated or contain unique alleles. Spatially explicit Bayesian clustering analyses suggest that three or four Pleistocene glacial refuges may have existed in the Southeastern United States, with a main post-glacial movement into the Northeast and the Great Lakes region. Efforts to conserve eastern hemlock genetic material should emphasize the capture of broad adaptability that occurs across the geographic range of the species, as well as genetic variability within regions with the highest allelic richness and heterozygosity, such as the Southern Appalachians and New England, and within disjunct populations that are genetically distinct. Much genetic variation exists in areas both infested and uninfested by the adelgid.
Starting Page	475
Ending Page	498
Page Count	24
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	13
Issue Number	2
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Phylogeography Pleistocene Migration Population genetics Microsatellite Bottleneck Plant Sciences Animal Anatomy / Morphology / Histology Evolutionary Biology Conservation Biology/Ecology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

Imperiled north american conifer.

An imperiled north american conifer.

an imperiled North American conifer

Macro-scale assessment of demographic and environmental variation within genetically derived evolutionary lineages of eastern hemlock (Tsuga canadensis), an imperiled conifer of the eastern United States

Microsatellite markers for eastern hemlock (Tsuga canadensis).

Evolutionary history of two endemic Appalachian conifers revealed using microsatellite markers

Silvical characteristics of eastern hemlock (Tsuga canadensis)

The eastern hemlock : Tsuga canadensis (Linn.) Carr.

Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

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Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer

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Macro-scale assessment of demographic and environmental variation within genetically derived evolutionary lineages of eastern hemlock (Tsuga canadensis), an imperiled conifer of the eastern United States

Microsatellite markers for eastern hemlock (Tsuga canadensis).

Evolutionary history of two endemic Appalachian conifers revealed using microsatellite markers

Silvical characteristics of eastern hemlock (Tsuga canadensis)

The eastern hemlock : Tsuga canadensis (Linn.) Carr.

Widespread inbreeding and unexpected geographic patterns of genetic variation in eastern hemlock (Tsuga canadensis), an imperiled North American conifer