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Mouillot D., Villeger S., Parravicini Valeriano, Kulbicki Michel, Arias-Gonzalez J. E., Bender M., Chabanet Pascale, Floeter S. R., Friedlander A., Vigliola Laurent, Bellwood D. R. (2014). Functional over-redundancy and high functional vulnerability in global fish faunas on tropical reefs. Proceedings of the National Academy of Sciences of the United States of America, 111 (38), 13757-13762. ISSN 0027-8424

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers14-11/010062559.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.1073/pnas.1317625111

Titre
Functional over-redundancy and high functional vulnerability in global fish faunas on tropical reefs
Année de publication2014
Type de documentArticle référencé dans le Web of Science WOS:000341988200032
AuteursMouillot D., Villeger S., Parravicini Valeriano, Kulbicki Michel, Arias-Gonzalez J. E., Bender M., Chabanet Pascale, Floeter S. R., Friedlander A., Vigliola Laurent, Bellwood D. R.
SourceProceedings of the National Academy of Sciences of the United States of America, 2014, 111 (38), p. 13757-13762. ISSN 0027-8424
RésuméWhen 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.
Plan de classementEcologie, systèmes aquatiques [036] ; Etudes, transformation, conservation du milieu naturel [082]
Descr. géo.ZONE TROPICALE
LocalisationFonds IRD [F B010062559]
Identifiant IRDfdi:010062559
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010062559

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