Perfeziona i miei risultati

Collection spécifique

Lingua

Université de Fribourg

Community‐level plant palatability increases with elevation as insect herbivore abundance declines

Descombes, Patrice ; Marchon, Jérémy ; Pradervand, Jean-Nicolas ; Bilat, Julia ; Guisan, Antoine ; Rasmann, Sergio ; Pellissier, Loïc

In: Journal of Ecology, 2017, vol. 105, no. 1, p. 142–151

Plants protect themselves against herbivore attacks through a myriad of physical structures and toxic secondary metabolites. Together with abiotic factors, herbivores are expected to modulate plant defence strategies within plant assemblages. Because the abundance of insect herbivore decreases in colder environments, the palatability of plants in communities at higher elevation should shift...

Université de Fribourg

Differential phenotypic and genetic expression of defence compounds in a plant–herbivore interaction along elevation

Salgado, Ana L. ; Suchan, Tomasz ; Pellissier, Loïc ; Rasmann, Sergio ; Ducrest, Anne-Lyse ; Alvarez, Nadir

In: Royal Society Open Science, 2016, vol. 3, no. 9, p. 160226

Elevation gradients impose large differences in abiotic and biotic conditions over short distances, in turn, likely driving differences in gene expression more than would genetic variation per se, as natural selection and drift are less likely to fix alleles at such a narrow spatial scale. As elevation increases, the pressure exerted on plants by herbivores and on arthropod herbivores by...

Université de Fribourg

High elevation Plantago lanceolata plants are less resistant to herbivory than their low elevation conspecifics: is it just temperature?

Pellissier, Loïc ; Roger, Aurélien ; Bilat, Julia ; Rasmann, Sergio

In: Ecography, 2014, p. -

Traits that mediate species interactions are evolutionarily shaped by biotic and abiotic drivers, yet we know relatively little about the relative importance of these factors. Herbivore pressure, along with resource availability and ‘third-party’ mutualists, are hypothesized to play a major role in the evolution of plant defence traits. Here, we used the model system Plantago lanceolata,...

Université de Fribourg

Differential allocation and deployment of direct and indirect defences by Vicia sepium along elevation gradients

Rasmann, Sergio ; Buri, Aline ; Gallot-Lavallée, Marie ; Joaquim, Jessica ; Purcell, Jessica ; Pellissier, Loïc

In: Journal of Ecology, 2014, p. -

Dissecting drivers of plant defence investment remains central for understanding the assemblage of communities across different habitats. There is increasing evidence that direct defence strategies against herbivores, including secondary metabolites production, differ along ecological gradients in response to variation in biotic and abiotic conditions. In contrast, intraspecific variation in...

Université de Neuchâtel

Simultaneous feeding by aboveground and belowground herbivores attenuates plant-mediated attraction of their respective natural enemies

Rasmann, Sergio ; Turlings, Ted C. J.

In: Oikos, 2007, vol. 10, no. 10, p. 926-936

Herbivore-damaged plants emit volatile organic compounds that attract natural enemies of the herbivores. This form of indirect plant defence occurs aboveground as well as belowground, but it remains unclear how simultaneous feeding by different herbivores attacking leaves and roots may affect the production of the respective defence signals. We employed a setup that combines trapping of volatile...

Université de Neuchâtel

First insights into specificity of belowground tritrophic interactions

Rasmann, Sergio ; Turlings, Ted C. J.

In: Oikos, 2008, vol. 117, no. 3, p. 362-369

Tritrophic interactions involving plants, herbivores and parasites have been only recently documented for belowground systems, where entomopathogenic nematodes can exploit root herbivore induced volatile compounds to locate their hosts. Little is known, however, about whether the specificity of such interactions rivals that of the remarkable interactions found in aboveground studies. Using a...

Université de Neuchâtel

The evolution of larval foraging behaviour in response to host plant variation in a leaf beetle

Gotthard, Karl ; Margraf, Nicolas ; Rasmann, Sergio ; Rahier, Martine

In: Oikos, 2005, vol. 109, no. 3, p. 503-512

The evolutionary causes of variation in host specialization among phytophagous insects are still not well understood and identifying them is a central task in insect–host plant biology. Here we examine host utilization of the chrysomelid beetle Oreina elongata that shows interpopulation variation in the degree of specialization. We focus on larval behaviour and on what selection...

Université de Neuchâtel

Recruitment of entomopathogenic nematodes by insect-damaged maize roots

Rasmann, Sergio ; Köllner, Tobias G. ; Degenhardt, Jörg ; Hiltpold, Ivan ; Toepfer, Stefan ; Kuhlmann, Ulrich ; Gershenzon, Jonathan ; Turlings, Ted C. J.

In: Nature, 2005, vol. 434, p. 732-737

Plants under attack by arthropod herbivores often emit volatile compounds from their leaves that attract natural enemies of the herbivores. Here we report the first identification of an insect-induced belowground plant signal, (E)-β-caryophyllene, which strongly attracts an entomopathogenic nematode. Maize roots release this sesquiterpene in response to feeding by larvae of the beetle...

Université de Neuchâtel

Belowground tritrophic interactions

Rasmann, Sergio ; Turlings, T. (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1849.

In response to phytophagous insects attack, plants produce volatile compounds that can serve as cues for natural enemies of the herbivore to locate their host or prey. Very substantial progress has been made in understanding such tritrophic interactions aboveground. Recently, however, it is more and more recognized that aboveground communities are influenced through physiological and biochemical...