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Auteur Hans K. Stenøien
Documents disponibles écrits par cet auteur (2)
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Glacial refugia and post-glacial colonization patterns in European bryophytes / Magni Olsen Kyrkjeeide in Lindbergia, 37 (2) (November 2014)
Titre : Glacial refugia and post-glacial colonization patterns in European bryophytes Type de document : Imprimé Auteurs : Magni Olsen Kyrkjeeide ; Hans K. Stenøien ; Kjell Ivar Flatberg (1943-) ; Kristian Hassel Année de publication : 2014 Article en page(s) : 47-59 Langues : Français (fre) Catégories : [Thématique] Bryophytes
Résumé : Most species are assumed to have survived south or east of the ice sheet covering northern Europe during the last glacial maximum. Molecular and macrofossil evidence suggests, however, that some species may have survived in ice-free areas in Scandinavia. In plants, inbreeding and vegetative growth are associated with low genetic load and enhanced survival in small, isolated populations. These characteristics are often found in bryophytes, possibly allowing them to survive extreme conditions in isolated refugia and also within ice sheets. Here, we review the Holocene bryophyte history in Europe highlighting main glacial refugia and post-glacial colonization routes. Also, meta-analyses are performed to investigate if distribution ranges and genetic structure are associated with life-history traits. Bryophytes survived the last glaciation in several refugia, but there is no unequivocal evidence of survival within the Scandinavian ice sheet. Northern Europe was colonized from southern, eastern and western Europe, as well as North America. Species with small spores have broader distribution ranges than species with large spores, and high frequency of sporophyte production is associated with limited genetic differentiation between populations. Identifiant pérenne : DOI : 10.25227/linbg.01046
in Lindbergia > 37 (2) (November 2014) . - 47-59Kyrkjeeide, M.O., Stenøien, H.K., Flatberg, K.I., Hassel, K., 2014 - Glacial refugia and post-glacial colonization patterns in European bryophytes ; Lindbergia, 37 (2) : 47-59.
Article (2014)Adobe Acrobat PDF
Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) / Myriam Gaudeul in American Journal of Botany, 94 (2007)
Titre : Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) Type de document : Électronique Auteurs : Myriam Gaudeul (1976-) ; Hans K. Stenøien ; Jon Ågren Année de publication : 2007 Article en page(s) : 1146-1155 Langues : Anglais (eng) Résumé : Colonization history, landscape structure, and environmental conditions may influence patterns of neutral genetic variation because of their effects on gene flow and reproductive mode. We compared variation at microsatellite loci within and among 26 Arabidopsis lyrata populations in two disjunct areas of its distribution in northern Europe (Norway and Sweden). The two areas probably share a common colonization history but differ in size (Norwegian range markedly larger than Swedish range), landscape structure (mountains vs. coast), and habitat conditions likely to affect patterns of gene flow and opportunities for sexual reproduction. Within-population genetic diversity was not related to latitude but was higher in Sweden than in Norway. Population differentiation was stronger among Norwegian than among Swedish populations (F(ST) = 0.23 vs. F(ST) = 0.18). The frequency of clonal propagation (proportion of identical multilocus genotypes) increased with decreasing population size, was higher in Norwegian than in Swedish populations, but was not related to altitude or substrate. Differences in genetic structure are discussed in relation to population characteristics and range size in the two areas. The results demonstrate that the possibility of clonal propagation should be considered when developing strategies for sampling and analyzing data in ecological and genetic studies of this emerging model species. Identifiant pérenne : DOI : 10.3732/ajb.94.7.1146
in American Journal of Botany > 94 (2007) . - 1146-1155Gaudeul, M., Stenøien, H.K., Ågren, J., 2007 - Landscape structure, clonal propagation and genetic diversity in Scandinavian populations of Arabidopsis lyrata (Brassicaceae) ; American Journal of Botany, 94 : 1146-1155.