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Title: Spatial and temporal assessments of genetic structure in an endangered Garry oak ecosystem on Vancouver Island
Contributor(s): Catherall, Erin E (author); Janes, Jasmine  (author)orcid ; Josefsson, Caroline A (author); Gorrell, Jamieson C (author)
Publication Date: 2018
Open Access: Yes
DOI: 10.1139/cjb-2017-0130
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Abstract: Garry oak (Quercus garryana Douglas ex Hook.) is a deciduous tree whose ecosystem is listed "at risk" throughout its range in British Columbia (BC), Canada, under the Canadian Species at Risk Act. Garry oak ecosystems host the most diverse flora for coastal BC, yet they account for less than 0.3% of the province's land coverage. Due to the loss and degradation of Garry oak habitat, many associated plant and animal species that rely on these sensitive ecosystems are endangered. Microsatellite markers were used to investigate temporal changes in fine-scale population genetic structure of 121 Garry oak trees from the Nanaimo region (Vancouver Island, BC) using diameter at breast height as a proxy for age. Overall, allelic diversity was moderate, ranging from 3.0 to 7.5 alleles per locus with a mean of 4.4 (± 0.4 SE) across all loci. Global fixation indices (FST) of 0.06 and 0.09 suggest significant departures from Hardy-Weinberg equilibrium among all populations and age-classified subpopulations, respectively. We found no evidence for change in genetic diversity across generations. Our results indicate low levels of differentiation within populations and high levels of gene flow among populations, suggesting an adaptive potential for Garry oaks in response to future climate change events.
Publication Type: Journal Article
Source of Publication: Botany, 96(4), p. 257-265
Publisher: NRC Research Press.
Place of Publication: Canada
ISSN: 1916-2804
Field of Research (FOR): 060799 Plant Biology not elsewhere classified
060399 Evolutionary Biology not elsewhere classified
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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