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Université de Fribourg

Alien plant species with a wider global distribution are better able to capitalize on increased resource availability

Dawson, Wayne ; Rohr, Rudolf P. ; Kleunen, Mark van ; Fischer, Markus

In: New Phytologist, 2012, vol. 194, no. 3, p. 859–867

A high ability of alien plant species to capitalize on increases in resource availability has been suggested as an explanation for being globally successful. Here, we tested this hypothesis meta-analytically using existing data from experiments manipulating plant resources (light, water and nutrients).From these studies we extracted the response to resource increase of biomass, as an indicator of...

Université de Fribourg

Anthropogenic disturbance as a driver of microspatial and microhabitat segregation of cytotypes of Centaurea stoebe and cytotype interactions in secondary contact zones

Mráz, Patrik ; Španiel, Stanislav ; Keller, Andreas ; Bowmann, Gillianne ; Farkas, Alexandre ; Šingliarová, Barbora ; Rohr, Rudolf P. ; Broennimann, Olivier ; Müller-Schärer, Heinz

In: Annals of Botany, 2012, p. -

Background and Aims: In a mixed-ploidy population, strong frequency-dependent mating will lead to the elimination of the less common cytotype, unless prezygotic barriers enhance assortative mating. However, such barriers favouring cytotype coexistence have only rarely been explored. Here, an assessment is made of the mechanisms involved in formation of mixed-ploidy populations and coexistence...

Université de Fribourg

Beware z-scores

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

In: Journal of Animal Ecology, 2019, vol. 88, no. 5, p. 808–809

Song, Rohr, and Saavedra (2017) have proposed a methodology to compare network properties across systems with different sizes and constraints, in response to the fact that z‐scores cannot be used for such purposes. Simmons, Hoeppke, and Sutherland (2019) have shown that part of the methodology can be improved. Here, we show that all previous results hold and are strengthened by the new...

Université de Fribourg

Co-formulation of Beauveria bassiana with natural substances to control pollen beetles – Synergy between fungal spores and colza oil

Kaiser, Deborah ; Handschin, Stephan ; Rohr, Rudolf P. ; Bacher, Sven ; Grabenweger, Giselher

In: Biological Control, 2020, vol. 140, p. 104106

Pollen beetles (Brassicogethes spp.) are a major pest in colza (Brassica napus L., also known as oilseed rape) and show increasing resistance to commonly used insecticides. Entomopathogenic fungi (EPF) such as Beauveria bassiana have potential as a sustainable alternative means of control. However, field applications of fungal spores targeting the immigrated beetles on the crop have not been...

Université de Fribourg

Components of phylogenetic signal in antagonistic and mutualistic networks.

Rohr, Rudolf P. ; Bascompte, Jordi

In: The American Naturalist, 2014, vol. 184, no. 5, p. 556–564

Recent studies have shown a phylogenetic signal in the structure of ecological networks, making the point that evolutionary history is important in explaining network architecture. However, this previous work has focused on either antagonistic (i.e., predator-prey) or mutualistic networks and has used different methodologies. Thus, a comparative assessment of both the frequency and the...

Université de Fribourg

Disentangling the effects of external perturbations on coexistence and priority effects

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

In: Journal of Ecology, 2020, p. 1365-2745.13349

A major challenge in ecological research is to identify the tolerance of ecological communities to external perturbations. Modern coexistence theory (MCT) has been widely adopted as a framework to investigate the tolerance to perturbations in relative reductions of per capita growth rates, often using metrics that explicitly eliminate the independent role of intrinsic growth rates. More...

Université de Fribourg

Ecophylogenetics: advances and perspectives

Mouquet, Nicolas ; Devictor, Vincent ; Meynard, Christine N. ; Munoz, Francois ; Bersier, Louis-Félix ; Chave, Jérôme ; Couteron, Pierre ; Dalecky, Ambroise ; Fontaine, Colin ; Gravel, Dominique ; Hardy, Olivier J. ; Jabot, Franck ; Lavergne, Sébastien ; Leibold, Mathew ; Mouillot, David ; Münkemüller, Tamara ; Pavoine, Sandrine ; Prinzing, Andreas ; Rodrigues, Ana S. L. ; Rohr, Rudolf P. ; Thébault, Elisa ; Thuiller, Wilfried

In: Biologial Review, 2012, vol. 87, no. 4, p. 769-785

Ecophylogenetics can be viewed as an emerging fusion of ecology, biogeography and macroevolution. This new and fast-growing field is promoting the incorporation of evolution and historical contingencies into the ecological research agenda through the widespread use of phylogenetic data. Including phylogeny into ecological thinking represents an opportunity for biologists from different fields...

Université de Fribourg

Explaining the variation in impacts of non-native plants on local-scale species richness: the role of phylogenetic relatedness

Vilà, Montserrat ; Rohr, Rudolf P. ; Espinar, José L. ; Hulme, Philip E. ; Pergl, Jan ; Roux, Johannes J. Le ; Schaffner, Urs ; Pyšek, Petr

In: Global Ecology and Biogeography, 2014, p. -

Aim: To assess how the magnitude of impacts of non-native plants on species richness of resident plants and animals varies in relation to the traits and phylogenetic position of the non-native as well as characteristics of the invaded site.Location: Global.Methods: Meta-analysis and phylogenetic regressions based on 216 studies were used to examine the effects of 96 non-native plant species on...

Université de Fribourg

The feasibility of equilibria in large ecosystems: A primary but neglected concept in the complexity-stability debate

Dougoud, Michaël ; Vinckenbosch, Laura ; Rohr, Rudolf P. ; Bersier, Louis-Félix ; Mazza, Christian

In: PLOS Computational Biology, 2018, vol. 14, no. 2, p. e1005988

The consensus that complexity begets stability in ecosystems was challenged in the seventies, a result recently extended to ecologically-inspired networks. The approaches assume the existence of a feasible equilibrium, i.e. with positive abundances. However, this key assumption has not been tested. We provide analytical results complemented by simulations which show that equilibrium...