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Articles containing the keyword 'isolation'.

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. https://doi.org/10.14214/sf.1516
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.

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 ORCID ID:E-mail: h.yousefzadeh@modares.ac.ir (email)
  • Hosseinzadeh Colagar, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran ORCID ID:E-mail: ahcolagar@umz.ac.ir
  • Fallah, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran ORCID ID:E-mail: fatemehfalah69@yahoo.com
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. https://doi.org/10.14214/sf.1516
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.

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 ORCID ID:E-mail: h.yousefzadeh@modares.ac.ir (email)
  • Hosseinzadeh Colagar, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran ORCID ID:E-mail: ahcolagar@umz.ac.ir
  • Fallah, Department of Molecular and Cell Biology; Faculty of Basic Sciences, University of Mazandaran, 47416-95447 Babolsar, Iran ORCID ID:E-mail: fatemehfalah69@yahoo.com
article id 905, category Research article
Katarzyna A. Jadwiszczak, Danuta Drzymulska, Agata Banaszek, Piotr Jadwiszczak. (2012). Population history, genetic variation and conservation status of the endangered birch species Betula nana L. in Poland. Silva Fennica vol. 46 no. 4 article id 905. https://doi.org/10.14214/sf.905
The effective conservation of species requires data on the levels and distribution of genetic diversity within and among populations. In this study, we estimated the genetic variation in three isolated populations of Betula nana in Poland. An analysis of 11 nuclear microsatellites revealed moderate mean heterozygosities (HO=0.556, HE=0.562), low mean number of alleles per locus (A=4.57) and no inbreeding in the total sample. An M-ratio test indicated that each population had experienced a severe bottleneck in the past. Tests for heterozygosity excess revealed that a significant decrease in the numbers of individuals in two populations had occurred quite recently. The large number of private alleles and very restricted number of migrants between populations (Nm=0.35) strongly suggest that genetic drift and geographic isolation are the primary factors responsible for the reduction of genetic variation in the Polish populations of B. nana. We detected two cpDNA haplotypes in the study populations, which can be explained in terms of either the genetic drift acting on the relict localities or a postglacial recolonisation from distinct refugia. Palynological data indicated that one refugium could be located in the Carpathians and their northern foreland. The primary threat to B. nana in Poland is the overgrowth of its habitats by competing species, which has likely resulted in a lack of generative reproduction in the mountain populations.
  • Jadwiszczak, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland ORCID ID:E-mail: kszalaj@uwb.edu.pl (email)
  • Drzymulska, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland ORCID ID:E-mail:
  • Banaszek, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland ORCID ID:E-mail:
  • Jadwiszczak, Institute of Biology, University of Białystok, wierkowa 20B, 15-950 Białystok, Poland ORCID ID:E-mail:

Category: Article

article id 7549, category Article
Tauno Kallio. (1971). Aerial distribution of some wood-inhabiting fungi in Finland. Acta Forestalia Fennica no. 115 article id 7549. https://doi.org/10.14214/aff.7549

Fungal diaspores were caught in Southern Finland (Helsinki, Turku, Jyväskylä, Lappeenranta) and in Northern Finland (Oulu, Ivalo) in 1967—68 on exposed discs of Picea abies (L.) Karst. wood. In the laboratory, the diaspores on the discs developed mycelia which stained the wood. A month after exposure fungi and bacteria were isolated from stained areas.

The number of identified fungal species was relatively high and included fungi of different taxonomic groups. The most common fungi identified were Peniophora gigantea and Trichoderma viride. The most common Agaricaceae obtained were species of Hypholoma. Of the fungi imperfecti, relatively high numbers of not only Trichoderma viride but also of the Alternaria and Fusarium species were isolated. According to the investigation, species of several fungal groups seem to participate in the early stages of the decayed process of spruce.

The PDF includes a summary in Finnish.

  • Kallio, ORCID ID:E-mail:

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