Résumé
The Biological Resource Centre for the Environment BRC4Env is a network of Biological Resource Centres (BRCs) and collections whose leading objectives are to improve the visibility of genetic and biological resources maintained by its BRCs and collections and to facilitate their use by a large research community, from agriculture research to life sciences and environmental sciences. Its added value relies on sharing skills, harmonizing practices, triggering projects in comparative biology, and ultimately proposing a single-entry portal to facilitate access to documented samples, taking into account the partnership policies of research institutions as well as the legal frame which varies with the biological nature of resources. BRC4Env currently includes three BRCs: the Centre for Soil Genetic Resources of the platform GenoSol, in partnership with the European Conservatory of Soil Samples; the Egg Parasitoids Collection (EP-Coll); and the collection of ichthyological samples, Colisa. BRC4Env is also associated to several biological collections: microbial consortia (entomopathogenic bacteria, freshwater microalgae…), terrestrial arthropods, nematodes (plant parasitic, entomopathogenic, animal parasitic...), and small mammals. The BRCs and collections of BRC4Env are involved in partnership with academic scientists, as well as private companies, in the fields of medicinal mining, biocontrol, sustainable agriculture, and additional sectors. Moreover, the staff of the BRCs is involved in many training courses for students from French licence degree to Ph.D, engineers, as well as ongoing training.
Auteurs, date et publication :
Auteurs Christian Mougin , Emmanuelle Artige , Frédéric Marchand , Samuel Mondy , Céline Ratié , Nadine Sellier , Philippe Castagnone-Sereno , Armelle Cœur D’Acier , Daniel Esmenjaud , Céline Faivre-Primot , Laurent Granjon , Valérie Hamelet , Frederic Lange , Sylvie Pagès , Frédéric Rimet , Nicolas Ris , Guillaume Sallé
Publication : Environmental Science and Pollution Research
Date : 2018
Volume : 25
Issue : 34
Pages : 33849-33857
Catégorie(s)
#BiochemEnv #Genosol #INRAEAuteurs, date et publication :
Auteurs Orlane Anneville , Isabelle Domaizon , Onur Kerimoglu , Frédéric Rimet , Stéphan Jacquet
Publication : Ecosystems
Date : 2025
Volume : 18
Issue : 3
Pages : 441-458
Catégorie(s)
#INRAE #OLARésumé
Boron concentrations and isotopic compositions of atmospheric dust and dissolved depositions were monitored over a two-year period (2012−2013) in the forest ecosystem of Montiers (Northeastern France). This time series allows the determination of the boron atmospheric inputs to this forest ecosystem and contributes to refine our understanding of the sources and processes that control the boron atmospheric cycle. Mean annual dust and dissolved boron atmospheric depositions are comparable in size (13 g· ha−1·yr−1 and 16 g·ha−1·yr−1, respectively), which however show significant intra- and interannual variations. Boron isotopes in dust differ from dissolved inputs, with an annual mean value of +1 ‰ and +18 ‰ for, respectively. The notable high boron contents (190−390 μg·g−1) of the dust samples are interpreted as resulting from localized spreading of boron-rich fertilizers, thus indicating a significant local impact of regional agricultural activities. Boron isotopes in dissolved depositions show a clear seasonal trend. The absence of correlation with marine cyclic solutes contradicts a control of atmospheric boron by dissolution of seasalts. Instead, the boron data from this study are consistent with a Rayleigh-like evolution of the atmospheric gaseous boron reservoir with possible but limited anthropogenic and/or biogenic contributions.
Auteurs, date et publication :
Auteurs Philippe Roux , Marie-Pierre Turpault , Gil Kirchen , Paul-Olivier Redon , Damien Lemarchand
Publication : Environmental Science & Technology
Date : 2017
Volume : 51
Issue : 24
Pages : 14038-14046
Catégorie(s)
#FORET Montiers #INRAERésumé
Soil mites (Acari) are ubiquitous in soil ecosystems and show a vast taxonomic diversity with a wide range of life history characteristics and feeding strategies. Various taxa contribute directly or indirectly to soil processes, including nutrient cycling, soil formation and pest control. Mites thus support important ecosystem services of soils. Yet, their community composition, and therewith service provisioning, may differ between for instance intensively managed agricultural soils and extensively managed grassland soils. We therefore hypothesized that successional changes in the abundance and diversity of soil mite functional groups (feeding types) will occur following a conversion of arable land to grassland, affecting their contribution to ecosystem services. To test this, we studied the succession of mite communities on two Long Term Observatories (LTOs) in Lusignan (France) and Veluwe (the Netherlands). At Lusignan, sampling involved four combinations of recent and historic land use types. At the Veluwe, samples were taken in a secondary succession chronosequence in grasslands, representing a time frame up to 29 years after the conversion from arable land to grassland. Biodiversity and biomass were higher in grassland than in arable land, especially for the total mite community, the predators and the main taxa aiding in decomposition. After conversion of grassland to arable land, or vice versa, both taxon richness and biomass rapidly developed towards the prevailing conditions. Our results indicated that the taxon richness and biomass of the total mite community in grassland still continued to increase up to 29 years after the conversion from arable land to grassland. Total taxon richness increased with time since conversion, which was mainly due to the immigration of decomposers and predators. The biomass of different feeding guilds increased at variable speeds. The observed changes imply an increase in nutrient cycling and in the suppression of some potential pests. We discuss the relevance of these ecosystem services in extensively managed grasslands and agricultural systems. Furthermore, our results suggest that in agricultural rotational schemes that include one or more years of grassland, mite communities and associated ecosystem services may be partially, but not completely, restored to the conditions of long term grassland.
Auteurs, date et publication :
Auteurs G. Arjen de Groot , Gerard A. J. M. Jagers op Akkerhuis , Wim J. Dimmers , Xavier Charrier , Jack H. Faber
Publication : Frontiers in Environmental Science
Date : 2016
Volume : 4
Catégorie(s)
#ACBB #ACBB Lusignan #INRAERésumé
Compared to conifers, broadleaf forests are less prone to soil and water acidification, because (1) they often have soils with larger exchangeable base cation pools, (2) the pollution scavenging capacity of deciduous trees is lower, and (3) they grow more slowly and are often less intensively managed. Since the 1980s, atmospheric deposition acidity has strongly decreased in forest ecosystems, so that the present acidification status of broadleaf forests should be improving. We used a 35 year-old beech plot in the Morvan Mountains (Burgundy, France) to question past and present acidification processes in broadleaf ecosystems. Soil exchangeable Mg, Ca and K pools measured from samples collected in 1974 and 2001 were compared and input-output budgets were computed over the 2003-2008 period. The objectives were (i) to assess Mg and Ca pool size changes over 1974-2008, (ii) to discuss the potential causes of these changes and, (iii) discuss the limits of conventional methods to study nutrient pool size changes (soil data comparison and nutrient budgets). Soil exchangeable Mg pools decreased during the 1974-2001 period while Ca and K pools remained constant, and very small. Soil solution monitoring and input-output budgets over the 2003-2008 period suggested an ongoing loss of exchangeable Ca and Mg, partly due to the desorption of sulphate from the soil which induced Mg, Ca and K depletion. Given the very low concentration in exchangeable base cations, and assuming no change in soil spatial variability, we computed that resampling soils at 10 years intervals may not unequivocally demonstrate a gain/loss of exchangeable base cations. Foliar Mg concentrations were continuously below the deficiency level, K and N concentrations decreased but Ca did not. From this, we discuss the validity/limits of the different approaches used, how the ecosystem can cope with such low levels of nutrients, and the fluxes and processes within the ecosystem that should be investigated in this perspective. (C) 2013 Elsevier B.V. All rights reserved.
Auteurs, date et publication :
Auteurs Gregory van der Heijden , Arnaud Legout , Benoit Pollier , Louis Mareschal , Marie-Pierre Turpault , Jacques Ranger , Etienne Dambrine
Publication : Forest Ecology and Management
Date : 2013
Volume : 293
Pages : 65-78
Catégorie(s)
#FORET Breuil #INRAERésumé
The inclusion of N2-fixing tree species in tree plantations has the potential to increase biomass production compared to monocultures. Both successes and failures have been described in the literature; however, it is still difficult to distinguish a general pattern and to disentangle the factors influencing the mixture effect. The first objective of this study was to provide an overview of the published data on the effect of the introduction of N2fixing trees in tree plantations through a meta-analysis approach and to calculate a mean effect of mixed-tree plantations on biomass production compared to monocultures of the non N2-fixing species in stands 2–20 years of age. The second objective was to evaluate the effects of (1) climate zone (temperate vs. tropical), (2) the species used (eucalypts vs. other non N2-fixing species, and leguminous tree species vs. other N2-fixing species), (3) the proportion of N2-fixing species compared to the non-fixing species, and (4) plant developmental stage. A total of 148 case studies from 34 experimental plantations under tropical (68 case studies) and temperate (80 case studies) conditions were identified from the literature. The global mixture effect was significantly positive, mixed-tree plantations being 18% more productive than the non N2-fixing monocultures, and this effect was significantly different from zero under temperate conditions (24% more productive) but not under tropical conditions (12% more productive). Indeed, the sites where the positive mixture effect was significantly different from zero were mostly located in a temperate climate, where soil nitrogen is generally considered less available than in tropical latitudes. Intermediate and high proportions of N2-fixing species gave similar positive results (27% more productive), while low proportions had no significant impact. Neither plantation age nor type of N2fixing species (legume trees vs. other N2-fixing species) had any significant effect. In conclusion, it appears that climate is the main factor influencing the success of the mixture; however, it also seems that the degree of mixture success is more marked on sites with low biomass production where the monoculture is the least productive.
Auteurs, date et publication :
Auteurs Nicolas Marron , Daniel Epron
Publication : Forest Ecology and Management
Date : 2025
Volume : 441
Pages : 242-252
Catégorie(s)
#FORET AgroTCR #INRAERésumé
Two experiments were conducted to test whether viruses, small auto- and heterotrophic nanoflagellates were key factors regulating at relatively short-term (4 days) and nearby periods (April vs. May) the bacterial community in surface waters of Lake Geneva. 2.5 L containing polycarbonate bottles were incubated in situ with either <2 µm or <10 µm filtered water with additions of either virus-free water or a viral concentrate. Abundances of viruses, prokaryotes and small autotrophs were obtained each day using flow cytometry, while bacterial richness was assessed using 16S rDNA PCR-DGGE and auto- and heterotrophic flagellates counted with epifluorescence microscopy at t0 and t96. Transmission electron microscopy was also used to assess virus-induced bacterial mortality at the start and the end of the experiments. Cloning-sequencing was applied on PCR products obtained after excision of selected DGGE bands to highlight more specifically the identity of bacteria of interest in the context of the experiment. The autotrophs and grazer presence and/or the virus enrichment resulted in different effects on the structure of the bacterial community and the impact was also different with the period. In May, bacterial structure changes seemed to be related to the impact or influence of the eukaryotes (including nanoflagellate grazers), while viruses might have a higher impact on the bacterial community structure the month before. This study provides new persuasive evidence that the presence of viruses and small eukaryotes are likely to drive bacterial community composition and shifts on the short-term in lacustrine ecosystems. More interestingly, such effects seem to be different between viruses and grazers, the ones sustaining, the others reducing bacterial community composition.
Auteurs, date et publication :
Auteurs Stéphan Jacquet , Isabelle Domaizon , Cécile Chardon , Sébastien Personnic
Publication : Advances in Microbiology
Date : 2025
Volume : 03
Issue : 03
Pages : 233-248
Catégorie(s)
#INRAE #OLARésumé
Phytoplankton growth depends on various factors, and primarily on nutrient availability, light and water temperature, whose distributions are largely controlled by hydrodynamics. Our main objective is to analyse the link between spatial and temporal variability of surface water temperature and algal concentration in a large lake by means of remote sensing and hydrodynamic modelling. We compare ten years of satellite images showing chlorophyll concentrations and surface water temperature of Lake Geneva. Our observations suggest different correlations depending on the season. Elevated chlorophyll concentrations in spring are correlated with warmer zones. But, in summer, higher chlorophyll concentrations are observed in colder zones. We show with a three-dimensional hydrodynamic model that the spatial variability of the surface water temperature reflects the upwelling and downwelling zones resulting from wind forcing. In springtime, nearshore downwellings induce locally increased surface temperature and stratification, which are associated with high chlorophyll concentration. In summertime, colder surface temperature area, often interpreted as transient upwellings, represents the thermal surface signature of wind-induced basin-scale internal waves, bringing either nutrients or phytoplankton from deeper layers to the surface. Our study suggests the latter to be the dominant process, with the basin-scale internal wave activity and associated transient summertime upwellings and downwellings having little net effects on the algal concentration. This study finally demonstrates the necessity to connect remote sensing retrievals and three-dimensional hydrodynamic modelling to properly understand the dynamic of the lake ecosystems.
Auteurs, date et publication :
Auteurs Damien Bouffard , Isabel Kiefer , Alfred Wüest , Stefan Wunderle , Daniel Odermatt
Publication : Remote Sensing of Environment
Date : 2025
Volume : 209
Pages : 510-523
Catégorie(s)
#INRAE #OLARésumé
Arbuscular mycorrhizal fungal (AMF) communities have been demonstrated to respond to a variety of biotic and abiotic factors, including various aspects of land management. Numerous studies have specifically addressed the impact of land use on AMF communities, but usually have been confined to one or a few sites. In this study, soil AMF assemblages were described in four different long-term observatories (LTOs) across Europe, each of which included a site-specific high-intensity and a low-intensity land use. AMF communities were characterized on the basis of 454 sequencing of the internal transcribed spacer 2 (ITS2) rDNA region. The primary goals of this study were (i) to determine the main factors that shape AMF communities in differentially managed sites in Europe and (ii) to identify individual AMF taxa or combinations of taxa suitable for use as biomarkers of land use intensification. AMF communities were distinct among LTOs, and we detected significant effects of management type and soil properties within the sites, but not across all sites. Similarly, indicator species were identified for specific LTOs and land use types but not universally for high- or low-intensity land uses. Different subsets of soil properties, including several chemical and physical variables, were found to be able to explain an important fraction of AMF community variation alone or together with other examined factors in most sites. The important factors were different from those for other microorganisms studied in the same sites, highlighting particularities of AMF biology.
Auteurs, date et publication :
Auteurs M.-L. Bouffaud , C. Bragalini , A. Berruti , M. Peyret-Guzzon , S. Voyron , H. Stockinger , D. van Tuinen , E. Lumini , D. Wipf , P. Plassart , P. Lemanceau , V. Bianciotto , D. Redecker , M. Girlanda
Publication : Mycorrhiza
Date : 2017
Volume : 27
Issue : 4
Pages : 331-343
Catégorie(s)
#Genosol #INRAEAuteurs, date et publication :
Auteurs Marie-Elodie Perga , Isabelle Domaizon , Jean Guillard , Valérie Hamelet , Orlane Anneville
Publication : Oecologia
Date : 2025
Volume : 172
Issue : 2
Pages : 551-562