Fragmentation-related patterns of genetic differentiation in pedunculate oak (Quercus robur) at two hierarchical scales

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Pohjanmies , T , Elshibli , S , Pulkkinen , P , Rusanen , M , Vakkari , P , Korpelainen , H & Roslin , T 2016 , ' Fragmentation-related patterns of genetic differentiation in pedunculate oak (Quercus robur) at two hierarchical scales ' , Silva Fennica , vol. 50 , no. 2 , 1510 . https://doi.org/10.14214/sf.1510

Title: Fragmentation-related patterns of genetic differentiation in pedunculate oak (Quercus robur) at two hierarchical scales
Author: Pohjanmies, Tähti; Elshibli, Sakina; Pulkkinen, Pertti; Rusanen, Mari; Vakkari, Pekka; Korpelainen, Helena; Roslin, Tomas
Contributor: University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
Date: 2016
Language: eng
Number of pages: 15
Belongs to series: Silva Fennica
ISSN: 0037-5330
URI: http://hdl.handle.net/10138/161260
Abstract: Populations at species' range margins are expected to show lower genetic diversity than populations at the core of the range. Yet, long-lived, widespread tree species are expected to be resistant to genetic impoverishment, thus showing comparatively high genetic diversity within populations and low differentiation among populations. Here, we study the distribution of genetic variation in the pedunculate oak (Quercus robur L.) at its range margin in Finland at two hierarchical scales using 15 microsatellite loci. At a regional scale, we compared variation within versus among three oak populations. At a landscape scale, we examined genetic structuring within one of these populations, growing on an island of ca 5 km(2). As expected, we found the majority of genetic variation in Q. robur to occur within populations. Nonetheless, differentiation among populations was markedly high (F-ST = 0.12) compared with values reported for populations of Q. robur closer to the core of its range. At the landscape level, some spatial and temporal sub-structuring was observed, likely explained by the history of land-use on the island. Overall, Q. robur fulfils the expectation of the central-marginal hypothesis of high differentiation among marginal populations, but the notable population differentiation has most likely been influenced also by the long, ongoing fragmentation of populations. Finnish oak populations may still be adjusting to the drastic habitat changes of the past centuries. Preservation of genetic variation within the remaining stands is thus an important factor in the conservation of Q. robur at its range margin.
Subject: microsatellites
genetic diversity
marginal populations
Finland
CHLOROPLAST DNA VARIATION
MULTILOCUS GENOTYPE DATA
PETRAEA MATT. LIEBL.
POPULATION-STRUCTURE
DIVERSITY
L.
MICROSATELLITES
COMMUNITY
MARKERS
FOREST
1181 Ecology, evolutionary biology
4112 Forestry
1183 Plant biology, microbiology, virology
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