Accueil > Communication > Actualités scientifiques > Publications scientifiques

Publications scientifiques RSS des Publications scientifiques

Page(s) : < | 1 | ... | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | ... | 252 |

9 février 2018

The relative importance of plant intraspecific diversity in structuring arthropod communities : a meta-analysis [Functional Ecology]

Keywords : associational resistance, biodiversity, community genetics, genetic diversity ; herbivory, natural enemies, plant-insect interactions, tritrophic interactions

1.Understanding how plant diversity influences higher trophic levels is important for predicting the consequences of global biodiversity loss. While early studies have focused on the effects of plant species richness, more recently a growing number of experiments have explored the effects of plant intraspecific diversity by manipulating the genotypic richness of plant communities.
2.By combining 162 estimates of effect size from 60 experimental studies, we examined the effects of plant genotypic richness on arthropods, one of the most diverse and abundant taxa which play a crucial role in many ecosystem processes and services. We have also compared the effects of plant genetic and species diversity on arthropods when both were manipulated within the same study.(...)

Lire la suite

9 février 2018

Biochemical mechanisms determine the functional compatibility of heterologous genes [Nature Communications]

Keywords : antimicrobial resistance, bacterial genetics, molecular evolution

Elucidating the factors governing the functional compatibility of horizontally transferred genes is important to understand bacterial evolution, including the emergence and spread of antibiotic resistance, and to successfully engineer biological systems. In silico efforts and work using single-gene libraries have suggested that sequence composition is a strong barrier for the successful integration of heterologous genes. Here we sample 200 diverse genes, representing >80% of sequenced antibiotic resistance genes, to interrogate the factors governing genetic compatibility in new hosts.(...)

Lire la suite

9 février 2018

Species co-occurrence analysis predicts management outcomes for multiple threats [Nature Ecology & Evolution]

Mitigating the impacts of global anthropogenic change on species is conservation’s greatest challenge. Forecasting the effects of actions to mitigate threats is hampered by incomplete information on species’ responses. We develop an approach to predict community restructuring under threat management, which combines models of responses to threats with network analyses of species co-occurrence. We discover that contributions by species to network co-occurrence predict their recovery under reduction of multiple threats.(...)

Lire la suite

8 février 2018

Profound genetic divergence and asymmetric parental genome contributions as hallmarks of hybrid speciation in polyploid toads [Proceedings of the Royal Society B - Biological Sciences]

Keywords : polyploidy, hybridization, divergence, multi-locus phylogeny, directional asymmetry, Bufo viridis subgroup

The evolutionary causes and consequences of allopolyploidization, an exceptional pathway to instant hybrid speciation, are poorly investigated in animals. In particular, when and why hybrid polyploids versus diploids are produced, and constraints on sources of paternal and maternal ancestors, remain underexplored. Using the Palearctic green toad radiation (including bisexually reproducing species of three ploidy levels) as model, we generate a range-wide multi-locus phylogeny of 15 taxa and present four new insights (...)

Lire la suite

8 février 2018

Cognitive performance is linked to group size and affects fitness in Australian magpies [Nature]

Keywords : behavioural ecology, evolutionary ecology

The social intelligence hypothesis states that the demands of social life drive cognitive evolution. This idea receives support from comparative studies that link variation in group size or mating systems with cognitive and neuroanatomical differences across species, but findings are contradictory and contentious. To understand the cognitive consequences of sociality, it is also important to investigate social variation within species. Here we show that in wild, cooperatively breeding Australian magpies, individuals that live in large groups show increased cognitive performance, which is linked to increased reproductive success.(...)

Lire la suite

Page(s) : < | 1 | ... | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | ... | 252 |