Auteurs, date et publication :
Auteurs Adeline Francois , Juliette Rousset , Marie Didier , André Evette
Date : 2024
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Eva Ringler , Rosanna Mangione , Max Ringler
Publication : Molecular ecology resources
Date : 2025
Volume : 15
Issue : 4
Pages : 737-746
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs M Alex Smith , Claudia Bertrand , Kate Crosby , Eldon S Eveleigh , Jose Fernandez-Triana , Brian L Fisher , Jason Gibbs , Mehrdad Hajibabaei , Winnie Hallwachs , Katharine Hind
Publication : PloS one
Date : 2025
Volume : 7
Issue : 5
Pages : e36514
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Unravelling evolution-by-environment interactions on the gut microbiome is particularly relevant considering the unprecedented level of human-driven disruption of the ecological and evolutionary trajectories of species. Here, we aimed to evaluate whether an evolutionary response to sizeselective mortality influences the gut microbiome of medaka (Oryzias latipes), how environmental conditions interact with the genetic background of medaka on their microbiota, and the association between microbiome diversity and medaka growth-related traits. To do so, we studied two lineages of medaka with known divergence in foraging efficiency and life history raised under antagonistic size-selective regimes for 10 generations (i.e. the largest or the smallest breeders were removed to mimic fishing-like or natural mortality). In pond mesocosms, the two lineages were subjected to contrasting population density and light intensity (used as proxies of resource availability). We observed significant differences in the gut microbiome composition and richness between the two lines, and this effect was mediated by light intensity. The bacterial richness of fishing-like medaka (small-breeder line) was reduced by 34% under low-light conditions compared to high-light conditions, while it remained unchanged in natural mortality-selected medaka (largebreeder line). However, the observed changes in bacterial richness did not correlate with changes in adult growth-related traits. Given the growing evidence about the gut microbiomes importance to host health, more in-depth studies are required to fully understand the role of the microbiome in size-selected organisms and the possible ecosystem-level consequences.
Auteurs, date et publication :
Auteurs Charlotte Evangelista , Stefaniya Kamenova , Beatriz Diaz Pauli , Joakim Sandkjenn , Leif Asbjørn Vøllestad , Eric Edeline , Pål Trosvik , Eric Jacques De Muinck
Publication : Peer Community Journal
Date : 2023
Volume : 3
Pages : e72
Catégorie(s)
#CNRS #ENS #PLANAQUARésumé
Gut microbiome diversity and functions are jointly shaped by the host’s genetic background and environmental conditions, but the consequences of this interaction are still unclear. Unravelling the effect of the interaction between evolution and environment on the gut microbiome is particularly relevant considering the unprecedented level of human-driven disruption on the ecological and evolutionary trajectories of species. Here, we aimed to evaluate whether size-selective mortality influences the gut microbiome of medaka (Oryzias latipes), how environment conditions modulate the effect of the genetic background of medaka on their microbiota, and the association between microbiome diversity and medaka fitness. To do so, we studied two lineages of medaka that were raised under antagonistic size-selective regimes for 10 generations (i.e. the largest or the smallest breeders were removed to mimic fishing-like or natural mortality). In pond mesocosms, the two lineages were subjected to contrasting population density and light intensity (i.e. used as a proxy of primary production, hence resource availability). We observed significant differences in the gut microbiome composition and richness between the two lines, and this effect was mediated by light intensity. Indeed, the bacterial richness of fishing-like medaka (small-breeder line) was reduced by 34% under low-light conditions compared to high-light conditions, while it remained unchanged in natural mortality-selected medaka (large-breeder line). However, the observed changes in bacterial richness did not correlate with changes in growth rate or body condition, possibly due to functional redundancy among the microbial taxa residing in the gut. Given the growing evidence about the gut microbiomes importance to host health, more in-depth studies are required to fully understand the role of the microbiome in size-selected organisms and the possible ecosystem-level consequences.
Auteurs, date et publication :
Auteurs C. Evangelista , S. Kamenova , B. Diaz Pauli , J. Sandkjenn , L. A. Vøllestad , E. Edeline , P. Trosvik , EJ de Muinck
Date : 2023
Catégorie(s)
#CNRS #ENS #PLANAQUARésumé
[Premise of the study: Wood density correlates with mechanical and physiological strategies of trees and is important for estimating global carbon stocks. Nonetheless, the relationship between branch and trunk xylem density has been poorly explored in neotropical trees. Here, we examine this relationship in trees from French Guiana and its variation among different families and sites, to improve the understanding of wood density in neotropical forests. Methods: Trunk and branch xylem densities were measured for 1909 trees in seven sites across French Guiana. A major-axis fit was performed to explore their general allometric relationship and its variation among different families and sites. Key results: Trunk xylem and branch xylem densities were significantly positively correlated, and their relationship explained 47% of the total variance. Trunk xylem was on average 9% denser than branch xylem. Family-level differences and interactions between family and site accounted for more than 40% of the total variance, whereas differences among sites explained little variation. Conclusions: Variation in xylem density within individual trees can be substantial, and the relationship between branch xylem and trunk xylem densities varies considerably among families and sites. As such, whole-tree biomass estimates based on non-destructive branch sampling should correct for both taxonomic and environmental factors. Furthermore, detailed estimates of the vertical distribution of wood density within individual trees are needed to determine the extent to which relying solely upon measures of trunk wood density may cause carbon stocks in tropical forests to be overestimated.]
Auteurs, date et publication :
Auteurs Carolina Sarmiento , Sandra Patiño , C. E. Timothy Paine , Jacques Beauchêne , Anne Thibaut , Christopher Baraloto
Publication : American Journal of Botany
Date : 2025
Volume : 98
Issue : 1
Pages : 140-149
Catégorie(s)
#CNRS #FORET NouraguesRésumé
The Publisher regrets that this article is an accidental duplication of an article that has already been published, https://doi.org/10.1016/S0007-4551(18)30393-X. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
Auteurs, date et publication :
Auteurs Alexandra Frelau , Marc Pracht , Samuel Le Sourd , Alexandra Lespagnol , Romain Corre , Cédric Ménard , Karin Tarte , Jean Mosser , Julien Edeline
Publication : Bulletin du Cancer
Date : 2018
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
Soil microbial communities in Mediterranean agroecosystems experience long drought periods that are typically combined with heat and frequently interspersed with rapid rewetting events. Agroforestry systems are of growing interest and viewed as possible alternative to conventional cropping systems in the context of climate change. Our aim was to evaluate the resistance and resilience of soil microbial communities against drought with or without heat stress at different distances from the tree row in an agroforestry system as compared to a conventional cropping system. Soils were sampled at several distances from the tree row in a 21-year-old walnut agroforestry system and a contiguous conventional crop in Southern France. We simulated two cycles of drying-rewetting under controlled conditions and applied three distinct treatments: control (without stress), drought and drought combined with heat stress. We monitored microbial respiration over the incubation period. The inorganic N and microbial biomass C, N and P contents (MBC, MBN and MBP) were assessed during the drying period (resistance), just after rewetting and at the end of the experiment (resilience), while bacterial and fungal abundances were measured at the end of the resistance period. We demonstrated that an agroforestry system can induce spatial heterogeneity in soil microbial biomass and functions under control conditions. Microbial biomass and activity, soil organic matter (SOM) and mineral N levels increased on the tree row. This spatial heterogeneity pattern was preserved for soil microbial response to drought combined or not with heat. Microorganisms sampled in the middle of the interrow or in the conventional crop exhibited highest biomass resistance and lowest resilience when facing combined drought and heat stress. Soil microbial biomass resistance and resilience were similar whatever the spatial position when microorganisms had to deal with drought stress only. Our findings suggested that despite higher SOM content, microbial biomass and activity at and near the tree row, the legacy effect of the tree row did not lead to higher ecological stability under stressful climatic conditions. We also demonstrated that soil microorganisms can considerably change their stoichiometry depending on the stress treatment. Soil microorganisms showed elevated MBC:MBN, MBC:MBP and variable MBN:MBP during the resistance period. A high stoichiometric flexibility of microorganisms was observed when exposed to drought stress only, while stoichiometric changes were irreversible when exposed to combined drought and heat stress.textless/ptextgreatertextless/divtextgreatertextless/divtextgreater
Auteurs, date et publication :
Auteurs Esther Guillot , Philippe Hinsinger , Lydie Dufour , Jacques Roy , Isabelle Bertrand
Publication : Soil Biology and Biochemistry
Date : 2025
Volume : 129
Issue : June 2018
Pages : 122–135
Catégorie(s)
#ANR-Citation #CNRS #Ecotron de MontpellierAuteurs, date et publication :
Auteurs Bradley Z. Carlson , Christophe F. Randin , Isabelle Boulangeat , Sébastien Lavergne , Wilfried Thuiller , Philippe Choler
Publication : Alpine Botany
Date : 2025
Volume : 123
Issue : 2
Pages : 41-53
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Anne-Laure Besnard , Daniel J. Park , Bernard J. Pope , Fleur Hammet , Sophie Michon-Coudouel , Marine Biget , Stacy A. Krueger-Hadfield , Stéphane Mauger , Eric J. Petit
Date : 2023