Stephen W. Mockford

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The estimation and maintenance of connectivity among local populations is an important conservation goal for many species at risk. We used Bayesian statistics and coalescent theory to estimate short- and long-term directional gene flow among subpopulations for two reptiles that occur in Canada as peripheral populations that are geographically disjunct from(More)
Blanding’s turtle is a North American freshwater turtle whose main range occurs south of the Great Lakes; disjunct populations occur east of the Appalachian Mountains from New York to Nova Scotia. The species is listed as threatened or endangered in most of its range. We employed five variable microsatellites to examine samples of 300 individuals in 12(More)
The Nova Scotia population of Blanding s turtle (Emydoidea blandingii) is small and disjunct but surprisingly contains spatial structure. In this paper we explore the nature of that structure and attempt to identify the processes underlying it. Recent studies of the species in Nova Scotia have identified three discrete groups in what was previously thought(More)
Random amplified polymorphic DNA (RAPD) was used to compare the Nova Scotia population of Blanding's turtle (Emydoidea blandingii) with several populations from the species' main range. The Nova Scotia population is believed to have been isolated from the main range for 4000-8000 years. Cluster analysis using a neighbour-joining algorithm produced a(More)
In Nova Scotia, Blanding’s turtles (Emydoidea blandingii) exist in a disjunct population complex at the extreme northeastern area of the species range. Pleasant River Fen in southwestern Nova Scotia provides habitat for one group within the Nova Scotia population. A ca. 10,000-year multi-proxy record to determine environmental variability at Pleasant River(More)
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