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Université de Fribourg

Linking comparative genomics of nine potato-associated pseudomonas isolates with their differing biocontrol potential against late blight

Vrieze, Mout De ; Varadarajan, Adithi R. ; Schneeberger, Kerstin ; Bailly, Aurélien ; Rohr, Rudolf P. ; Ahrens, Christian H. ; Weisskopf, Laure

In: Frontiers in Microbiology, 2020, vol. 11, p. 857

For plants, the advantages of associating with beneficial bacteria include plant growth promotion, reduction of abiotic and biotic stresses and enhanced protection against various pests and diseases. Beneficial bacteria rightly equipped for successful plant colonization and showing antagonistic activity toward plant pathogens seem to be actively recruited by plants. To gain more insights into...

Université de Fribourg

Towards a probabilistic understanding about the context-dependency of species interactions

Song, Chuliang ; Ahn, Sarah Von ; Rohr, Rudolf P. ; Saavedra, Serguei

In: Trends in Ecology & Evolution, 2020, vol. 35, no. 5, p. 384–396

Observational and experimental studies have shown that an interaction class between two species (be it mutualistic, competitive, antagonistic, or neutral) may switch to a different class, depending on the biotic and abiotic factors within which species are observed. This complexity arising from the evidence of context-dependencies has underscored a difficulty in establishing a systematic ...

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

Functional similarity and dissimilarity facilitate alien plant invasiveness along biotic and abiotic gradients in an arid protected area

El-Barougy, Reham F. ; Elgamal, Ibrahim ; Rohr, Rudolf P. ; Probert, Anna F. ; Khedr, Abdel-Hamid A. ; Bacher, Sven

In: Biological Invasions, 2020, vol. 22, no. 6, p. 1997–2016

Two contradictory hypotheses have been put forth to forecast alien invasiveness: being either functionally similar, or dissimilar, to resident natives along environmental gradients. The ‘try-harder’ hypothesis predicts that alien plants will be functionally dissimilar to natives and should thus exhibit exaggerated trait values when compared to natives in respect to resource extraction or...

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

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

Increased temperature disrupts the biodiversity–ecosystem functioning relationship

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

In: The American Naturalist, 2018, vol. 193, no. 2, p. 227–239

Gaining knowledge of how ecosystems provide essential services to humans is of primary importance, especially with the current threat of climate change. Yet little is known about how increased temperature will impact the biodiversity–ecosystem functioning (BEF) relationship. We tackled this subject theoretically and experimentally. We developed a BEF theory based on mechanistic population ...

Université de Fribourg

Understanding negative biodiversity–ecosystem functioning relationship in semi-natural wildflower strips

Sandau, Nadine ; Naisbit, Russell E. ; Fabian, Yvonne ; Bruggisser, Odile T. ; Kehrli, Patrik ; Aebi, Alexandre ; Rohr, Rudolf P. ; Bersier, Louis-Félix

In: Oecologia, 2019, vol. 189, no. 1, p. 185–197

Studies on biodiversity–ecosystem functioning (BEF) in highly controlled experiments often yield results incompatible with observations from natural systems: experimental results often reveal positive relationships between diversity and productivity, while for natural systems, zero or even negative relationships have been reported. The discrepancy may arise due to a limited or closed local...

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...

Université de Fribourg

Towards the integration of niche and network theories

Godoy, Oscar ; Bartomeus, Ignasi ; Rohr, Rudolf P. ; Saavedra, Serguei

In: Trends in Ecology & Evolution, 2018, vol. 33, no. 4, p. 287–300

The quest for understanding how species interactions modulate diversity has progressed by theoretical and empirical advances following niche and network theories. Yet, niche studies have been limited to describe coexistence within tropic levels despite incorporating information about multi-trophic interactions. Network approaches could address this limitation, but they have ignored the...