Accueil > Communication > Newsletter scientifique > Publications

Publications RSS des Publications

Page(s) : < | 1 | ... | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | ... | 187 |

11 juillet 2017

Sex-specific evolution during the diversification of live-bearing fishes [Nature Ecology & Evolution]

Natural selection is often assumed to drive parallel functional diversification of the sexes. But males and females exhibit fundamental differences in their biology, and it remains largely unknown how sex differences affect macroevolutionary patterns. On microevolutionary scales, we understand how natural and sexual selection interact to give rise to sex-specific evolution during phenotypic diversification and speciation. Here we show that ignoring sex-specific patterns of functional trait evolution misrepresents the macroevolutionary adaptive landscape and evolutionary rates for 112 species of live-bearing fishes (Poeciliidae).(...)

Lire la suite

11 juillet 2017

Biological annihilation via the ongoing sixth mass extinction signaled by vertebrate population losses and declines [PNAS]

Keywords : sixth mass extinction, population declines, population extinctions, conservation, ecosystem service

The population extinction pulse we describe here shows, from a quantitative viewpoint, that Earth’s sixth mass extinction is more severe than perceived when looking exclusively at species extinctions. Therefore, humanity needs to address anthropogenic population extirpation and decimation immediately. That conclusion is based on analyses of the numbers and degrees of range contraction (indicative of population shrinkage and/or population extinctions according to the International Union for Conservation of Nature) using a sample of 27,600 vertebrate species, and on a more detailed analysis documenting the population extinctions between 1900 and 2015 in 177 mammal species.(...)

Lire la suite

7 juillet 2017

Global dosage compensation is ubiquitous in Lepidoptera, but counteracted by the masculinization of the Z chromosome [Molecular Biology & Evolution]

Keywords : sex chromosome evolution, sex-biased gene expression, faster-Z, tissue-specific expression, gonads, female-heterogamety

While chromosome-wide dosage compensation of the X chromosome has been found in many species, studies in ZW clades have indicated that compensation of the Z is more localized and/or incomplete. In the ZW Lepidoptera, some species show complete compensation of the Z chromosome, while others lack full equalization, but what drives these inconsistencies is unclear. Here, we compare patterns of male and female gene expression on the Z chromosome of two closely related butterfly species, Papilio xuthus and Papilio machaon, and in multiple tissues of two moths species, Plodia interpunctella and Bombyx mori, which were previously found to differ in the extent to which they equalize Z-linked gene expression between the sexes(...)

Lire la suite

7 juillet 2017

Skin microbiota in frogs from the Brazilian Atlantic Forest : Species, forest type, and potential against pathogens [PLOS One]

Subject Areas : forests, amphibians, microbiome, bacteria, frogs, bacterial pathogens, fungal pathogens, sequence databases

The cutaneous microbiota of amphibians can be defined as a biological component of protection, since it can be composed of bacteria that produce antimicrobial compounds. Several factors influence skin microbial structure and it is possible that environmental variations are among one of these factors, perhaps through physical-chemical variations in the skin. This community, therefore, is likely modified in habitats in which some ecophysiological parameters are altered, as in fragmented forests. Our research goal was to compare the skin bacterial community of four anuran species of the Atlantic Forest of Brazil in landscapes from two different environments : continuous forest and fragmented forest.(...)

Lire la suite

5 juillet 2017

Constraining the timing of whole genome duplication in plant evolutionary history [Proceedings of the Royal Society B - Biological Sciences]

Whole genome duplication (WGD) has occurred in many lineages within the tree of life and is invariably invoked as causal to evolutionary innovation, increased diversity, and extinction resistance. Testing such hypotheses is problematic, not least since the timing of WGD events has proven hard to constrain. Here we show that WGD events can be dated through molecular clock analysis of concatenated gene families, calibrated using fossil evidence for the ages of species divergences that bracket WGD events. (...)

Lire la suite

Page(s) : < | 1 | ... | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | ... | 187 |