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Silva Fennica 1926-1997
Acta Forestalia Fennica

Articles containing the keyword 'genetic drift'

Category : Research article

article id 1516, category Research article
Hamed Yousefzadeh, Abasalt Hosseinzadeh Colagar, Fatemeh Fallah. (2016). Genetic diversity of geographically isolated Iranian populations of Betula pendula Roth: implications for conservation. Silva Fennica vol. 50 no. 3 article id 1516.
Keywords: genetic differentiation; habitat isolation; haplotype diversity; genetic drift; long-term isolation
Highlights: The Iranian populations of birches exhibited high levels of genetic diversity, population differentiation, and the presence of unique haplotypes; The high genetic differentiation amongst the populations may contribute to the local geographical structure and poor gene flow amongst individuals; The results can potentially be used to adopt appropriate strategies for the conservation and management of isolated tree populations.
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The effects of long-term habitat fragmentations on genetic and population differentiation of Betula pendula Roth were investigated using chloroplast DNA (cpDNA) variations. Leaf samples were collected from four small remnant populations across the north of Iran. Three pairs of universal primers were used to amplify cpDNA, large single copy regions of trnC-trnD, trnK1-trnK2 and trnD-trnT. A total of 18 of the cpDNA haplotypes in the four populations were identified, however, no clear phylogeographic structuring of haplotypes could be detected. The total genetic diversity (HT) for all populations was high (0.932). Average intra-population genetic diversity was estimated as HS = 0.729 and average differentiation of populations GST = 0.218. Mantel tests of isolation by distance revealed a significant relationship between Wright’s inbreeding coefficient (Fst) and geographical distances for the four populations in Iran (r = 0.77, p < 0.05). The results of the hierarchical analysis of molecular variance (AMOVA) indicated that a 66% variation was partitioned within populations, whilst the variance amongst the four populations was only 34%. We suggest that significant genetic differentiation amongst populations can likely be attributed to reduced gene flow as a result of habitat fragmentation.

  • Yousefzadeh, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Nour, Mazandaran, Iran E-mail: (email)
  • Hosseinzadeh Colagar, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran E-mail:
  • Fallah, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran E-mail:

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