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Université de Fribourg

A multi-platform package for the analysis of intra- and interspecific trait evolution

Gaboriau, Théo ; Mendes, Fábio K. ; Joly, Simon ; Silvestro, Daniele ; Salamin, Nicolas

In: Methods in Ecology and Evolution, 2020, p. -

Evolutionary forces affect the distribution of phenotypes both within and among species. Yet, at the macro‐evolutionary scale, the evolution of intraspecific variance is rarely considered. Here, we present an r and a BEAST 2 implementation that extends the JIVE (Joint inter‐ and Intraspecific Variance Evolution) model aimed at the analysis of continuous trait evolution at both inter‐...

Université de Fribourg

The effects of temperature and dispersal on species diversity in natural microbial metacommunities

Parain, Elodie C. ; Gray, Sarah M. ; Bersier, Louis-Félix

In: Scientific Reports, 2019, vol. 9, no. 1, p. 18286

Dispersal is key for maintaining biodiversity at local- and regional scales in metacommunities. However, little is known about the combined effects of dispersal and climate change on biodiversity. Theory predicts that alpha-diversity is maximized at intermediate dispersal rates, resulting in a hump-shaped diversity-dispersal relationship. This relationship is predicted to flatten when...

Université de Fribourg

Admixture mapping in interspecific Populus hybrids identifies classes of genomic architectures for phytochemical, morphological and growth traits

Bresadola, Luisa ; Caseys, Céline ; Castiglione, Stefano ; Buerkle, C. Alex ; Wegmann, Daniel ; Lexer, Christian

In: New Phytologist, 2019, vol. 223, no. 4, p. 2076–2089

The genomic architecture of functionally important traits is key to understanding the maintenance of reproductive barriers and trait differences when divergent populations or species hybridize. We conducted a genome-wide association study (GWAS) to study trait architecture in natural hybrids of two ecologically divergent Populus species. We genotyped 472 seedlings from a natural hybrid zone...

Université de Fribourg

3D morphology of pharyngeal dentition of the genus Capoeta (Cyprinidae): Implications for taxonomy and phylogeny

Ayvazyan, Anna ; Vasilyan, Davit ; Böhme, Madelaine

In: Journal of Zoological Systematics and Evolutionary Research, 2019, vol. 57, no. 1, p. 179–190

Capoeta is a herbivorous cyprinid fish genus, widely distributed in water bodies of Western Asia. Recent species show a distinct biogeographic pattern with endemic distribution in large fluvial drainage basins. As other cyprinids, the species of this genus are characterized by the presence of the pharyngeal bone with pharyngeal teeth. Despite this, the detailed morphology of the pharyngeal...

Université de Fribourg

A guideline to study the feasibility domain of multi-trophic and changing ecological communities

Song, Chuliang ; Rohr, Rudolf P. ; Saavedra, Serguei

In: Journal of Theoretical Biology, 2018, vol. 450, p. 30–36

The feasibility domain of an ecological community can be described by the set of environmental abiotic and biotic conditions under which all co-occurring and interacting species in a given site and time can have positive abundances. Mathematically, the feasibility domain corresponds to the parameter space compatible with positive (feasible) solutions at equilibrium for all the state variables...