Patterns of genetic variation in leading-edge populations of Quercus robur : genetic patchiness due to family clusters

Show full item record



Permalink

http://hdl.handle.net/10138/319912

Citation

Vakkari , P , Rusanen , M , Heikkinen , J , Huotari , T & Karkkainen , K 2020 , ' Patterns of genetic variation in leading-edge populations of Quercus robur : genetic patchiness due to family clusters ' , Tree Genetics & Genomes , vol. 16 , no. 5 , 73 . https://doi.org/10.1007/s11295-020-01465-9

Title: Patterns of genetic variation in leading-edge populations of Quercus robur : genetic patchiness due to family clusters
Author: Vakkari, Pekka; Rusanen, Mari; Heikkinen, Juha; Huotari, Tea; Karkkainen, Katri
Contributor organization: Department of Agricultural Sciences
Research Centre for Ecological Change
Tvärminne Zoological Station
Date: 2020-09-14
Language: eng
Number of pages: 12
Belongs to series: Tree Genetics & Genomes
ISSN: 1614-2942
DOI: https://doi.org/10.1007/s11295-020-01465-9
URI: http://hdl.handle.net/10138/319912
Abstract: The genetic structure of populations at the edge of species distribution is important for species adaptation to environmental changes. Small populations may experience non-random mating and differentiation due to genetic drift but larger populations, too, may have low effective size, e.g., due to the within-population structure. We studied spatial population structure of pedunculate oak,Quercus robur, at the northern edge of the species' global distribution, where oak populations are experiencing rapid climatic and anthropogenic changes. Using 12 microsatellite markers, we analyzed genetic differentiation of seven small to medium size populations (census sizes 57-305 reproducing trees) and four populations for within-population genetic structures. Genetic differentiation among seven populations was low (Fst = 0.07). We found a strong spatial genetic structure in each of the four populations. Spatial autocorrelation was significant in all populations and its intensity (Sp) was higher than those reported in more southern oak populations. Significant genetic patchiness was revealed by Bayesian structuring and a high amount of spatially aggregated full and half sibs was detected by sibship reconstruction. Meta-analysis of isoenzyme and SSR data extracted from the (GD)(2)database suggested northwards decreasing trend in the expected heterozygosity and an effective number of alleles, thus supporting the central-marginal hypothesis in oak populations. We suggest that the fragmented distribution and location of Finnish pedunculate oak populations at the species' northern margin facilitate the formation of within-population genetic structures. Information on the existence of spatial genetic structures can help conservation managers to design gene conservation activities and to avoid too strong family structures in the sampling of seeds and cuttings for afforestation and tree improvement purposes.
Subject: Spatial genetic structure
Relatedness
Kinship reconstruction
Marginal populations
OAK QUERCUS-ROBUR
BEECH FAGUS-SYLVATICA
PETRAEA MATT. LIEBL.
INBREEDING DEPRESSION
FRAGMENTED STANDS
COMPUTER-PROGRAM
FOREST TREES
L.
FLOW
LOCI
1184 Genetics, developmental biology, physiology
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
Vakkari2020_Art ... OfGeneticVariationInLe.pdf 4.669Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record