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Auteur Amossé, J.; Bettarel, Y.; Bouvier, C.; Bouvier, T.; Tran Duc, T.; Doan Thu, T.; Jouquet, P.
Titre The flows of nitrogen, bacteria and viruses from the soil to water compartments are influenced by earthworm activity and organic fertilization (compost vs. vermicompost) Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Soil Biology & Biochemistry
Volume 66 Numéro Pages 197-203
Mots-Clés Bacterial and viral abundance; Bacterial diversity; Compost; Dichogaster bolaui; Earthworms; Leaching; Organic fertilization; Vermicompost
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ISSN 0038-0717 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 892
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Auteur Buisson, L.; Grenouillet, G.; Villeger, S.; Canal, J.; Laffaille, P.
Titre Toward a loss of functional diversity in stream fish assemblages under climate change Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Glob. Change Biol.
Volume 19 Numéro 2 Pages 387-400
Mots-Clés assemblages; biotic homogenization; bird communities; climate change; distribution models; ecosystem; environmental-change; fresh-water biodiversity; functional traits; habitat; no-analog communities; range shifts; species; species distribution; stream fish; traits
Résumé The assessment of climate change impacts on biodiversity has so far been biased toward the taxonomic identification of the species likely either to benefit from climate modifications or to experience overall declines. There have still been few studies intended to correlate the characteristics of species to their sensitivity to climate change, even though it is now recognized that functional trait-based approaches are promising tools for addressing challenges related to global changes. In this study, two functional indices (originality and uniqueness) were first measured for 35 fish species occurring in French streams. They were then combined to projections of range shifts in response to climate change derived from species distribution models. We set out to investigate: (1) the relationship between the degrees of originality and uniqueness of fish species, and their projected response to future climate change; and (2) the consequences of individual responses of species for the functional diversity of fish assemblages. After accounting for phylogenetic relatedness among species, we have demonstrated that the two indices used measure two complementary facets of the position of fish species in a functional space. We have also rejected the hypothesis that the most original and/or less redundant species would necessarily experience the greatest declines in habitat suitability as a result of climate change. However, individual species range shifts could lead simultaneously both to a severe decline in the functional diversity of fish assemblages, and to an increase in the functional similarity among assemblages, supporting the hypothesis that disturbance favors communities with combination of common traits and biotic homogenization as well. Our findings therefore emphasize the importance of going beyond the simple taxonomic description of diversity to provide a better assessment of the likely future effects of environmental changes on biodiversity, thus helping to design more effective conservation and management measures.
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Volume de collection Numéro de collection Edition
ISSN 1354-1013 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 897
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Auteur Tedesco, P.A.; Oberdorff, T.; Cornu, J.-F.; Beauchard, O.; Brosse, S.; Dürr, H.H.; Grenouillet, G.; Leprieur, F.; Tisseuil, C.; Zaiss, R.; Hugueny, B.
Titre A scenario for impacts of water availability loss due to climate change on riverine fish extinction rates Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Journal of Applied Ecology
Volume 50 Numéro 5 Pages 1105-1115
Mots-Clés aridity index; current anthropogenic threats; diversity loss; drainage area; freshwater fish diversity; habitat availability; time to extinction
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ISSN 1365-2664 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 405
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Auteur Gravel, D.; Poisot, T.; Albouy, C.; Velez, L.; Mouillot, D.
Titre Inferring food web structure from predator-prey body size relationships Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Methods in Ecology and Evolution
Volume 4 Numéro 11 Pages 1083-1090
Mots-Clés Body size; Niche model; biodiversity; climate-change; community; constraints; ecological networks; ecology; ecosystems; food web; impacts; interaction strengths; metaweb; models; species richness
Résumé 1. Current global changes make it important to be able to predict which interactions will occur in the emerging ecosystems. Most of the current methods to infer the existence of interactions between two species require a good knowledge of their behaviour or a direct observation of interactions. In this paper, we overcome these limitations by developing a method, inspired from the niche model of food web structure, using the statistical relationship between predator and prey body size to infer the matrix of potential interactions among a pool of species. 2. The novelty of our approach is to infer, for any species of a given species pool, the three species-specific parameters of the niche model. The method applies to both local and metaweb scales. It allows one to evaluate the feeding interactions of a new species entering the community. 3. We find that this method gives robust predictions of the structure of food webs and that its efficiency is increased when the strength of the body-size relationship between predators and preys increases. 4. We finally illustrate the potential of the method to infer the metaweb structure of pelagic fishes of the Mediterranean sea under different global change scenarios.
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ISSN 2041-210x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 674
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Auteur Escalas, A.; Bouvier, T.; Mouchet, M.A.; Leprieur, F.; Bouvier, C.; Troussellier, M.; Mouillot, D.
Titre A unifying quantitative framework for exploring the multiple facets of microbial biodiversity across diverse scales Type Article scientifique
Année (up) 2013 Publication Revue Abrégée Environmental microbiology
Volume 15 Numéro 10 Pages 2642-2657
Mots-Clés Microbial communities; Rao quadratic entropy; metagenomic; microbial biodiversity; molecular fingerprint; β diversity
Résumé Recent developments of molecular tools have revolutionized our knowledge of microbial biodiversity by allowing detailed exploration of its different facets and generating unprecedented amount of data. One key issue with such large datasets is the development of diversity measures that cope with different data outputs and allow comparison of biodiversity across different scales. Diversity has indeed three components: local (alpha), regional (gamma) and the overall difference between local communities (beta). Current measures of microbial diversity, derived from several approaches, provide complementary but different views. They only capture the beta component of diversity, compare communities in a pairwise way, consider all species as equivalent or lack a mathematically explicit relationship among the alpha, beta and gamma components. We propose a unified quantitative framework based on the Rao quadratic entropy, to obtain an additive decomposition of diversity (gamma = alpha + beta), so the three components can be compared, and that integrate the relationship (phylogenetic or functional) among Microbial Diversity Units that compose a microbial community. We show how this framework is adapted to all types of molecular data, and we highlight crucial issues in microbial ecology that would benefit from this framework and propose ready-to-use R-functions to easily set up our approach.
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ISSN 1462-2920 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 430
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