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Auteur Klein, J.C.; Verlaque, M.
Titre Temporal trends in invasion impacts in macrophyte assemblages of the Mediterranean Sea Type Article scientifique
Année 2012 Publication Revue Abrégée Cah. Biol. Mar.
Volume 53 Numéro 3 Pages 403-407
Mots-Clés Benthic; Biological invasions; Caulerpa racemosa var. cylindracea; Species introductions; algae; area; assemblages; chlorophyta; harbor; racemosa; var. cylindracea caulerpales
Résumé Invasive species are able to deeply alter coastal marine ecosystems ranging them among the most influential global changes of the present time. In the context of spatio-temporal variability, temporal trajectories of invasion impacts are very poorly known processes. The aim of the present study was to examine the impact of the invasive Caulerpa racemosa var. cylindracea (Chlorophyta) on benthic macrophyte assemblages in the north-western Mediterranean Sea (Marseille, France). A comparison was made between two different months (March versus November) and between years (2002/2003 versus 2006/2007). The results showed that there was significant variability between months and years in the biomass of Caulerpa as well as in its impact on macrophyte assemblages. In addition, Caulerpa outcompeted other invasive species, such as Asparagopsis armata and Womersleyella setacea, which showed strongly reduced biomass in invaded compared with non-invaded patches.
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ISSN 0007-9723 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 884
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Auteur Toussaint, A.; Beauchard, O.; Oberdorff, T.; Brosse, S.; Villeger, S.
Titre Worldwide freshwater fish homogenization is driven by a few widespread non-native species Type Article scientifique
Année 2016 Publication Revue Abrégée Biol. Invasions
Volume 18 Numéro 5 Pages 1295-1304
Mots-Clés australia; Beta-diversity; biogeography; biotic homogenization; dispersal; distinctiveness; diversity; Exotic species; faunas; Freshwater fish; iberian peninsula; Introduction; introductions; taxonomic dissimilarity; Translocation
Résumé Introduction of non-native species have changed the composition of freshwater fish assemblages throughout the world and hence the dissimilarity between them, either toward homogenization (i.e. decrease in dissimilarity) or differentiation (i.e. increase in dissimilarity). However, there is still no assessment of individual contributions of non-native species to this overall trend at the global scale. Here, we disentangle individual non-native species effect from the global effect of the whole introduced species pool at the biogeographic realm scale and test which determinant can explain the effect of non-native species on changes in assemblage dissimilarity. Our results show that the contribution of introduced species on changes in dissimilarity is highly variable and all directions of changes are observed through the introduction process, i.e. either toward homogenization, differentiation or no change. Overall, only a few widespread species contribute to the worldwide homogenization pattern, whereas most of introduced species slightly contribute to the global change in dissimilarity. The effect of species on change in dissimilarity was influenced by the introduction pressure but also by whether introduced species were translocated (i.e. introduced to other basins within their biogeographic realm) or exotic (i.e. introduced from other biogeographic realms). Homogenization is strongly determined by the species translocated within a realm and only by few widespread exotic species whereas the majority of exotics contribute to a differentiation effect. Nevertheless, under future intensified human pressure, the exotic species spread across realms is predicted to increase and their differentiation effect might turn towards homogenization, and might trigger the global homogenization trend.
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ISSN 1387-3547 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1654
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Auteur Toussaint, A.; Charpin, N.; Beauchard, O.; Grenouillet, G.; Oberdorff, T.; Tedesco, P.A.; Brosse, S.; Villeger, S.
Titre Non-native species led to marked shifts in functional diversity of the world freshwater fish faunas Type Article scientifique
Année 2018 Publication Revue Abrégée Ecol. Lett.
Volume 21 Numéro 11 Pages 1649-1659
Mots-Clés assemblages; biodiversity; Biotic exchanges; communities; extinction; extirpations; functional richness; functional divergence; homogenization; hydropower; introduction; invasion; islands; macroecology; patterns; richness
Résumé Global spread of non-native species profoundly changed the world biodiversity patterns, but how it translates into functional changes remains unanswered at the world scale. We here show that while in two centuries the number of fish species per river increased on average by 15% in 1569 basins worldwide, the diversity of their functional attributes (i.e. functional richness) increased on average by 150%. The inflation of functional richness was paired with changes in the functional structure of assemblages, with shifts of species position toward the border of the functional space of assemblages (i.e. increased functional divergence). Non-native species moreover caused shifts in functional identity toward higher body sized and less elongated species for most of assemblages throughout the world. Although varying between rivers and biogeographic realms, such changes in the different facets of functional diversity might still increase in the future through increasing species invasion and may further modify ecosystem functioning.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 1461-023x ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2425
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Auteur Villeger, S.; Blanchet, S.; Beauchard, O.; Oberdorff, T.; Brosse, S.
Titre From current distinctiveness to future homogenization of the world's freshwater fish faunas Type Article scientifique
Année 2015 Publication Revue Abrégée Diversity Distrib.
Volume 21 Numéro 2 Pages 223-235
Mots-Clés extirpation; freshwater fish; introduction; Non-native species; taxonomic similarity; taxonomic uniqueness
Résumé Aim Assessing the consequences of a future increase in non-native species introductions and native species extirpations on taxonomic similarity among fish faunas. Location World-wide. Methods We designed 42 scenarios of future species introductions and extirpations to simulate future fish composition for 1054 river basins. Using these simulated future compositions, we computed the change in taxonomic similarity among pairs of fish faunas from historical to future situation at the river basin, biogeographic realm and world scales. Results According to all our scenarios, taxonomic similarity among fish faunas will strongly increase in the future at the three spatial scales considered. Fish faunas from the Southern Hemisphere, which are currently the less affected by taxonomic homogenization, are forecasted to show the steepest changes. Our scenarios also reveal that non-native species introductions will account for most of the predicted changes, whereas the effect of native species extirpations will be weak. Main conclusions The predicted future taxonomic homogenization will blur the current high level of taxonomic dissimilarity among freshwater fish faunas, and therefore, imperil the conservation programmes based on beta-diversity mapping.
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ISSN 1472-4642 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1289
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