Structure et variabilité génétique de populations d'épinette noire ( Picea mariana (Mill.) B.S.P.) dans la zone hémiarctique du Nouveau-Québec

• Published in: Canadian Journal of Forest Research
• Main Authors: Desponts, Mireille, Simon, Jean-Pierre
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1987
• Subjects: Ecology; Forestry; Global and Planetary Change; Noire; Subarctic
• Online Access: http://dx.doi.org/10.1139/x87-156; http://www.nrcresearchpress.com/doi/pdf/10.1139/x87-156

The genetic structure of five populations of black spruce located at l'Eau Claire Lake, in the subarctic region of Nouveau-Québec, were analysed by acrylamide gel electrophoresis of seven enzyme systems. The analysis of 25 loci disclosed an average polymorphism of 0.80 and a level of heterozygosity of 0.351. Results indicate that there is no loss of genetic variability in these marginal populations that could be attributed to genetic drift. Data based on Wright's statistics indicate an excess of heterozygotes for most loci. Populations share the same alleles at most loci and are only slightly differentiated from each other (F st = 0.06). Results suggest that gene flow between these isolated populations remains sufficiently high to override the effect of geographic isolation.