High Nuclear Genetic Diversity, High Levels of Outcrossing and Low Differentiation Among Remnant Populations of Quercus Petraea at the Margin of Its Range in Ireland

Overview

Journal Ann Bot

Publisher Oxford University Press

Specialty Biology

Date 2004 Apr 17

PMID 15087303

Citations 12

Authors

Graham Muir

Andrew J Lowe

Colin C Fleming

Claus Vogl

Affiliations

Soon will be listed here.

Abstract

Background And Aims: Quercus petraea colonized Ireland after the last glaciation from refugia on mainland Europe. Deforestation, however, beginning in Neolithic times, has resulted in small, scattered forest fragments, now covering less than 12,000 ha.

Methods: Plastid (three fragments) and microsatellite variation (13 loci) were characterized in seven Irish populations sampled along a north-south gradient. Using Bayesian approaches and Wright's F-statistics, the effects of colonization and fragmentation on the genetic structure and mating patterns of extant oak populations were investigated.

Key Results: All populations possessed cytotypes common to the Iberian Peninsula. Despite the distance from the refugial core and the extensive deforestation in Ireland, nuclear genetic variation was high and comparable to mainland Europe. Low population differentiation was observed within Ireland and populations showed no evidence for isolation by distance. As expected of a marker with an effective population size of one-quarter relative to the nuclear genome, plastid variation indicated higher differentiation. Individual inbreeding coefficients indicated high levels of outcrossing.

Conclusions: Consistent with a large effective population size in the historical migrant gene pool and/or with high gene flow among populations, high within-population diversity and low population differentiation was observed within Ireland. It is proposed that native Q. petraea populations in Ireland share a common phylogeographic history and that the present genetic structure does not reflect founder effects.

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