Université de Fribourg

Molecular ecology studies of species radiations: current research gaps, opportunities and challenges

la Harpe, Marylaure de ; Paris, Margot ; Karger, Dirk N. ; Rolland, Jonathan ; Kessler, Michael ; Salamin, Nicolas ; Lexer, Christian

In: Molecular Ecology, 2017, p. -

Understanding the drivers and limits of species radiations is a crucial goal of evolutionary genetics and molecular ecology, yet research on this topic has been hampered by the notorious difficulty of connecting micro- and macroevolutionary approaches to studying the drivers of diversification. To chart the current research gaps, opportunities and challenges of molecular ecology approaches to...

Université de Fribourg

Small-scale patterns in snowmelt timing affect gene flow and the distribution of genetic diversity in the alpine dwarf shrub Salix herbacea

Cortés, Andres J. ; Waeber, Stephan ; Lexer, Christian ; Sedlacek, J. ; Wheeler, J. A. ; Kleunen, Mark van ; Bossdorf, O. ; Hoch, G. ; Rixen, C. ; Wipf, S . ; Karrenberg, S.

In: Heredity, 2014, p. -

Current threats to biodiversity, such as climate change, are thought to alter the within-species genetic diversity among microhabitats in highly heterogeneous alpine environments. Assessing the spatial organization and dynamics of genetic diversity within species can help to predict the responses of organisms to environmental change. In this study, we evaluated whether small-scale heterogeneity...

Université de Fribourg

Some like it cold: distribution, ecology and phylogeny of Arenaria bernensis Favarger (Caryophyllaceae) from the western Prealps in Switzerland

Berthouzoz, Marjorie ; Maendly, Simon ; Bétrisey, Sébastien ; Mangili, Sofia ; Prunier, Patrice ; Lexer, Christian ; Kozlowski, Gregor

In: Alpine Botany, 2013, vol. 123, no. 2, p. 65–75

Arenaria bernensis (Caryophyllaceae), traditionally placed within the Arenaria ciliata aggregate and discovered only in 1955, is a poorly studied endemic taxon of western Prealps in Switzerland. In this study, we aimed to deliver the first detailed appraisal on morphology, distribution and ecology of A. bernensis accompanied by first molecular insights into the A. ciliata aggregate using...

Université de Fribourg

Components of reproductive isolation between Orchis mascula and Orchis pauciflora

Scopece, Giovanni ; Croce, Antonio ; Lexer, Christian ; Cozzolino, Salvatore

In: Evolution, 2013, vol. 67, no. 7, p. 2083–2093

Studies of the strength and nature of reproductive isolation (RI) between species can greatly contribute to our understanding of speciation. Although the role of RI in speciation is well recognized, there is a dearth of information on the contributions of different barriers between related plant species. Here, we estimated multiple components of RI between two Mediterranean orchid sister species...