Enregistrements |
Auteur |
Ménard, F.; Benivary, H.D.; Bodin, N.; Coffineau, N.; Le Loc'h, F.; Mison, T.; Richard, P.; Potier, M. |
Titre |
Stable isotope patterns in micronekton from the Mozambique Channel |
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Article scientifique |
Année |
2014 |
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Revue Abrégée |
Deep Sea Research Part II: Topical Studies in Oceanography |
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100 |
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153-163 |
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Diel vertical migration; mesoscale; micronekton; Mozambique Channel; Oceanic eddies; trophic level; δ13C; δ15N |
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0967-0645 |
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LL @ pixluser @ |
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343 |
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Béhagle, N.; du Buisson, L.; Josse, E.; Lebourges-Dhaussy, A.; Roudaut, G.; Ménard, F. |
Titre |
Mesoscale features and micronekton in the Mozambique Channel: An acoustic approach |
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Article scientifique |
Année |
2014 |
Publication |
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Revue Abrégée |
Deep Sea Research Part II: Topical Studies in Oceanography |
Volume |
100 |
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Pages |
164-173 |
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Acoustics; Mesoscale eddies; micronekton; Mozambique Channel; Satellite altimetry |
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0967-0645 |
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LL @ pixluser @ |
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344 |
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Mouillot, D.; Villeger, S.; Parravicini, V.; Kulbicki, M.; Arias-González, J.E.; Bender, M.; Chabanet, P.; Floeter, S.R.; Friedlander, A.; Vigliola, L.; Bellwood, D.R. |
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Functional over-redundancy and high functional vulnerability in global fish faunas on tropical reefs |
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Article scientifique |
Année |
2014 |
Publication |
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Revue Abrégée |
Proceedings of the National Academy of Sciences of the United States of America |
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111 |
Numéro |
38 |
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13757-13762 |
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When tropical systems lose species, they are often assumed to be buffered against declines in functional diversity by the ability of the species-rich biota to display high functional redundancy: i.e., a high number of species performing similar functions. We tested this hypothesis using a ninefold richness gradient in global fish faunas on tropical reefs encompassing 6,316 species distributed among 646 functional entities (FEs): i.e., unique combinations of functional traits. We found that the highest functional redundancy is located in the Central Indo-Pacific with a mean of 7.9 species per FE. However, this overall level of redundancy is disproportionately packed into few FEs, a pattern termed functional over-redundancy (FOR). For instance, the most speciose FE in the Central Indo-Pacific contains 222 species (out of 3,689) whereas 38% of FEs (180 out of 468) have no functional insurance with only one species. Surprisingly, the level of FOR is consistent across the six fish faunas, meaning that, whatever the richness, over a third of the species may still be in overrepresented FEs whereas more than one third of the FEs are left without insurance, these levels all being significantly higher than expected by chance. Thus, our study shows that, even in high-diversity systems, such as tropical reefs, functional diversity remains highly vulnerable to species loss. Although further investigations are needed to specifically address the influence of redundant vs. vulnerable FEs on ecosystem functioning, our results suggest that the promised benefits from tropical biodiversity may not be as strong as previously thought. |
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MARBEC @ isabelle.vidal-ayouba @ |
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600 |
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Zupan, L.; Cabeza, M.; Maiorano, L.; Roquet, C.; Devictor, V.; Lavergne, S.; Mouillot, D.; Mouquet, N.; Renaud, J.; Thuiller, W. |
Titre |
Spatial mismatch of phylogenetic diversity across three vertebrate groups and protected areas in Europe |
Type  |
Article scientifique |
Année |
2014 |
Publication |
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Revue Abrégée |
Diversity and Distributions |
Volume |
20 |
Numéro |
6 |
Pages |
674-685 |
Mots-Clés |
Europe; Species diversity; approach; biodiversity; climate-change; communities; ecological; evolutionary diversity; functional diversity; global patterns; hotspots; nature conservation; phylogenetic diversity; protected areas; spatial biodiversity congruence; species richness; terrestrial vertebrates; unified |
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Aim We investigate patterns of phylogenetic diversity in relation to species diversity for European birds, mammals and amphibians to evaluate their congruence and highlight areas of particular evolutionary history. We estimate the extent to which the European network of protected areas (PAs) network retains interesting evolutionary history areas for the three groups separately and simultaneously. Location Europe Methods Phylogenetic (QE(PD)) and species diversity (SD) were estimated using the Rao's quadratic entropy at 10 ' resolution. We determined the regional relationship between QE(PD) and SD for each taxa with a spatial regression model and used the tails of the residuals (QE(RES)) distribution to identify areas of higher and lower QE(PD) than predicted. Spatial congruence of biodiversity between groups was assessed with Pearson correlation coefficient. A simple classification scheme allowed building a convergence map where a convergent pixel equalled to a QE(RES) value of the same sign for the three groups. This convergence map was overlaid to the current PAs network to estimate the level of protection in convergent pixels and compared it to a null expectation built on 1000 randomization of PAs over the landscape. Results QE(RES) patterns across vertebrates show a strong spatial mismatch highlighting different evolutionary histories. Convergent areas represent only 2.7% of the Western Palearctic, with only 8.4% of these areas being covered by the current PAs network while a random distribution would retain 10.4% of them. QE(RES) are unequally represented within PAs: areas with higher QE(PD) than predicted are better covered than expected, while low QE(PD) areas are undersampled. Main conclusions Patterns of diversity strongly diverge between groups of vertebrates in Europe. Although Europe has the world's most extensive PAs network, evolutionary history of terrestrial vertebrates is unequally protected. The challenge is now to reconcile effective conservation planning with a contemporary view of biodiversity integrating multiple facets. |
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English |
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1366-9516 |
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MARBEC @ isabelle.vidal-ayouba @ |
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856 |
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Clavier, J.; Chauvaud, L.; Amice, E.; Lazure, P.; van der Geest, M.; Labrosse, P.; Diagne, A.; Carlier, A.; Chauvaud, S. |
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Benthic metabolism in shallow coastal ecosystems of the Banc d’Arguin, Mauritania |
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Article scientifique |
Année |
2014 |
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Revue Abrégée |
Marine Ecology Progress Series |
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501 |
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11-23 |
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MARBEC @ alain.herve @ 1236 |
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1368 |
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