Résumé
In the French West Indies (FWI), the soil, andosols, ferralsols and nitisols, is highly polluted by chlordecone, although this organochlorine insecticide extensively applied to banana crops has been banned for 20years. This contamination has led to a major human health concern inducing the need for remediation of the contaminated soils. Work was conducted to help to evaluate the impact of remediation processes on the microbial communities from these soils. Microbial biomass was estimated after direct DNA extraction from three chlordecone-contaminated soils (an andosol, a ferralsol and a nitisol) and the bacterial community analyzed using t-RFLP. The FWI volcanic andosol was particularly recalcitrant to usual direct DNA extraction protocols hampering analysis of soil microbial communities until now, in contrast with the 2 other soils. For the first time, DNA was directly extracted from a FWI andosol based on yeast RNA addition at the lysis step. Differences in microbial biomass were thus observed between the 3 FWI soils. Moreover, the bacterial community structure was significantly distinct from each other’s and related to soil physico-chemical characteristics. Interestingly, differences in bacterial diversity could not be exclusively attributed to the level of chlordecone contamination.
Auteurs, date et publication :
Auteurs Anne Mercier , Marie-Christine Dictor , Jennifer Harris-Hellal , Dominique Breeze , Christophe Mouvet
Publication : Chemosphere
Date : 2013
Volume : 92
Issue : 7
Pages : 787-794
Catégorie(s)
#Genosol #INRAERésumé
Analysis of the 16S rRNA gene sequences generated from Xerocomus pruinatus and Scleroderma citrinum ectomycorrhizospheres revealed that similar bacterial communities inhabited the two ectomycorrhizospheres in terms of phyla and genera, with an enrichment of the Burkholderia genus. Compared to the bulk soil habitat, ectomycorrhizospheres hosted significantly more Alpha-, Beta-, and Gammaproteobacteria.
Auteurs, date et publication :
Auteurs S. Uroz , P. Oger , E. Morin , P. Frey-Klett
Publication : Applied and Environmental Microbiology
Date : 2012
Volume : 78
Issue : 8
Pages : 3020-3024
Catégorie(s)
#FORET Breuil #INRAEAuteurs, date et publication :
Auteurs Quentin Aemig , Claire Chéron , Nadine Delgenès , Julie Jimenez , Sabine Houot , Jean-Philippe Steyer , Dominique Patureau
Publication : Waste Management
Date : 2025
Volume : 48
Pages : 389-396
Catégorie(s)
#INRAE #PRO #PRO QualiAgroRésumé
Seminal fluid proteins (SFPs) can trigger drastic changes in mating partners, mediating post-mating sexual selection and associated sexual conflict. Also, cross-species comparisons have demonstrated that SFPs evolve rapidly and hint that post-mating sexual selection drives their rapid evolution. In principle, this pattern should be detectable within species as rapid among-population divergence in SFP expression and function. However, given the multiple other factors that could vary among populations, isolating divergence in SFP-mediated effects is not straightforward. Here, we attempted to address this gap by combining the power of a common garden design with functional assays involving artificial injection of SFPs in the simultaneously hermaphroditic freshwater snail, Lymnaea stagnalis. We detected among-population divergence in SFP gene expression, suggesting that seminal fluid composition differs among four populations collected in Western Europe. Furthermore, by artificially injecting seminal fluid extracted from these field-derived snails into standardized mating partners, we also detected among-population divergence in the strength of post-mating effects induced by seminal fluid. Both egg production and subsequent sperm transfer of partners differed depending on the population origin of seminal fluid, with the response in egg production seemingly closely corresponding to among-population divergence in SFP gene expression. Our results thus lend strong intraspecific support to the notion that SFP expression and function evolve rapidly, and confirm L. stagnalis as an amenable system for studying processes driving SFP evolution.
Auteurs, date et publication :
Auteurs Yumi Nakadera , Alice Thornton Smith , Léa Daupagne , Marie-Agnès Coutellec , Joris M. Koene , Steven A. Ramm
Publication : Journal of Evolutionary Biology
Date : 2025
Volume : 33
Issue : 10
Pages : 1440-1451
Catégorie(s)
#INRAE #PEARLAuteurs, date et publication :
Auteurs Pottier G. , Marchand F. , D. Azam , Rives J. , Breugnot E. , Vigneron T.
Date : 2025
Pages : 27
Catégorie(s)
#INRAE #PEARLAuteurs, date et publication :
Auteurs Pottier G.
Date : 2025
Catégorie(s)
#INRAE #PEARLAuteurs, date et publication :
Auteurs Gaétan Pottier , Frédéric Marchand
Date : 2025
Pages : 11
Catégorie(s)
#INRAE #PEARLRésumé
Estimates of carbon leaching losses from different land use systems are few and their contribution to the net ecosystem carbon balance is uncertain. We investigated leaching of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and dissolved methane (CH4), at forests, grasslands, and croplands across Europe. Biogenic contributions to DIC were estimated by means of its δ13C signature. Leaching of biogenic DIC was 8.3±4.9 g m−2 yr−1 for forests, 24.1±7.2 g m−2 yr−1 for grasslands, and 14.6±4.8 g m−2 yr−1 for croplands. DOC leaching equalled 3.5±1.3 g m−2 yr−1 for forests, 5.3±2.0 g m−2 yr−1 for grasslands, and 4.1±1.3 g m−2 yr−1 for croplands. The average flux of total biogenic carbon across land use systems was 19.4±4.0 g C m−2 yr−1. Production of DOC in topsoils was positively related to their C/N ratio and DOC retention in subsoils was inversely related to the ratio of organic carbon to iron plus aluminium (hydr)oxides. Partial pressures of CO2 in soil air and soil pH determined DIC concentrations and fluxes, but soil solutions were often supersaturated with DIC relative to soil air CO2. Leaching losses of biogenic carbon (DOC plus biogenic DIC) from grasslands equalled 5–98% (median: 22%) of net ecosystem exchange (NEE) plus carbon inputs with fertilization minus carbon removal with harvest. Carbon leaching increased the net losses from cropland soils by 24–105% (median: 25%). For the majority of forest sites, leaching hardly affected actual net ecosystem carbon balances because of the small solubility of CO2 in acidic forest soil solutions and large NEE. Leaching of CH4 proved to be insignificant compared with other fluxes of carbon. Overall, our results show that leaching losses are particularly important for the carbon balance of agricultural systems.
Auteurs, date et publication :
Auteurs Reimo Kindler , Jan Siemens , Klaus Kaiser , David C. Walmsley , Christian Bernhofer , Nina Buchmann , Pierre Cellier , Werner Eugster , Gerd Gleixner , Thomas Grũnwald , Alexander Heim , Andreas Ibrom , Stephanie K. Jones , Mike Jones , Katja Klumpp , Werner Kutsch , Klaus Steenberg Larsen , Simon Lehuger , Benjamin Loubet , Rebecca Mckenzie
Publication : Global Change Biology
Date : 2025
Volume : 17
Issue : 2
Pages : 1167-1185
Catégorie(s)
#ACBB #ACBB Theix #INRAERésumé
Methods: An approach based on three-term local quadrat variance (T3) which assesses population variability in a three-year moving window, was used to overcome species directional trend effects. This “detrending” approach was applied to common indices of synchrony across a worldwide collection of 77 temporal plant community datasets comprising almost 7,800 individual plots sampled for at least six years. Plots included were either maintained under constant “control” conditions over time or were subjected to different management or disturbance treatments.
Results: Accounting for directional trends increased the detection of year-to-year synchronous patterns in all synchrony indices considered. Specifically, synchrony values increased significantly in ~40% of the datasets with the T3 detrending approach while in ~10% synchrony decreased. For the 38 studies with both control and manipulated conditions, the increase in synchrony values was stronger for longer time series, particularly following experimental manipulation.
Conclusions: Species’ long-term directional trends can affect synchrony and stability measures potentially masking the ecological mechanism causing year-to-year
Auteurs, date et publication :
Auteurs Enrique Valencia , Francesco de Bello , Jan Lepš , Thomas Galland , Anna E‐Vojtkó , Luisa Conti , Jiří Danihelka , Jürgen Dengler , David J. Eldridge , Marc Estiarte , Ricardo García‐González , Eric Garnier , Daniel Gómez , Susan Harrison , Tomas Herben , Ricardo Ibáñez , Anke Jentsch , Norbert Juergens , Miklós Kertész , Katja Klumpp
Publication : Journal of Vegetation Science
Date : 2025
Volume : 31
Issue : 5
Pages : 792-802
Catégorie(s)
#ACBB #ACBB Theix #INRAEAuteurs, date et publication :
Auteurs Xu Zhong , Stephan Jacquet
Publication : Freshwater Biology
Date : 2025
Volume : 59
Issue : 8
Pages : 1577-1595