Consulta: creatorFacets:"Villéger, Sébastien"
Registros recuperados: 10
Data/hora: 06/06/2024 14:37:40

Interspecific differences in environmental response blur trait dynamics in classic statistical analyses
Provedor de dados: 5
Autores: Mclean, Matthew; Mouillot, David; Villéger, Sébastien; Graham, Nicholas A. J.; Auber, Arnaud.
Trait-based ecology strives to better understand how species, through their bio-ecological traits, respond to environmental changes, and influence ecosystem functioning. Identifying which traits are most responsive to environmental changes can provide insight for understanding community structuring and developing sustainable management practices. However, misinterpretations are possible, because standard statistical methods (e.g., principal component analysis and linear regression) for identifying and ranking the responses of different traits to environmental changes ignore interspecific differences. Here, using both artificial data and real-world examples from marine fish communities, we show how considering species-specific responses can lead to...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00591/70266/68369.pdf

Meeting fisheries, ecosystem function, and biodiversity goals in a human-dominated world
Provedor de dados: 5
Autores: Cinner, Joshua E.; Zamborain-mason, Jessica; Gurney, Georgina G.; Graham, Nicholas A. J.; Macneil, M. Aaron; Hoey, Andrew S.; Mora, Camilo; Villéger, Sébastien; Maire, Eva; Mcclanahan, Tim R.; Maina, Joseph M.; Kittinger, John N.; Hicks, Christina C.; D’agata, Stephanie; Huchery, Cindy; Barnes, Michele L.; Feary, David A.; Williams, Ivor D.; Kulbicki, Michel; Vigliola, Laurent; Wantiez, Laurent; Edgar, Graham J.; Stuart-smith, Rick D.; Sandin, Stuart A.; Green, Alison L.; Beger, Maria; Friedlander, Alan M.; Wilson, Shaun K.; Brokovich, Eran; Brooks, Andrew J.; Cruz-motta, Juan J.; Booth, David J.; Chabanet, Pascale; Tupper, Mark; Ferse, Sebastian C. A.; Sumaila, U. Rashid; Hardt, Marah J.; Mouillot, David.
The worldwide decline of coral reefs necessitates targeting management solutions that can sustain reefs and the livelihoods of the people who depend on them. However, little is known about the context in which different reef management tools can help to achieve multiple social and ecological goals. Because of nonlinearities in the likelihood of achieving combined fisheries, ecological function, and biodiversity goals along a gradient of human pressure, relatively small changes in the context in which management is implemented could have substantial impacts on whether these goals are likely to be met. Critically, management can provide substantial conservation benefits to most reefs for fisheries and ecological function, but not biodiversity goals, given...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73532/72911.pdf

A new method to control error rates in automated species identification with deep learning algorithms
Provedor de dados: 5
Autores: Villon, Sébastien; Mouillot, David; Chaumont, Marc; Subsol, Gérard; Claverie, Thomas; Villéger, Sébastien.
Processing data from surveys using photos or videos remains a major bottleneck in ecology. Deep Learning Algorithms (DLAs) have been increasingly used to automatically identify organisms on images. However, despite recent advances, it remains difficult to control the error rate of such methods. Here, we proposed a new framework to control the error rate of DLAs. More precisely, for each species, a confidence threshold was automatically computed using a training dataset independent from the one used to train the DLAs. These species-specific thresholds were then used to post-process the outputs of the DLAs, assigning classification scores to each class for a given image including a new class called “unsure”. We applied this framework to a study case...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00640/75244/75406.pdf

Exceptional but vulnerable microbial diversity in coral reef animal surface microbiomes
Provedor de dados: 5
Autores: Chiarello, Marlène; Auguet, Jean-christophe; Graham, Nicholas A. J.; Claverie, Thomas; Sucré, Elliott; Bouvier, Corinne; Rieuvilleneuve, Fabien; Restrepo-ortiz, Claudia Ximena; Bettarel, Yvan; Villéger, Sébastien; Bouvier, Thierry.
Coral reefs host hundreds of thousands of animal species that are increasingly threatened by anthropogenic disturbances. These animals host microbial communities at their surface, playing crucial roles for their fitness. However, the diversity of such microbiomes is mostly described in a few coral species and still poorly defined in other invertebrates and vertebrates. Given the diversity of animal microbiomes, and the diversity of host species inhabiting coral reefs, the contribution of such microbiomes to the total microbial diversity of coral reefs could be important, yet potentially vulnerable to the loss of animal species. Analysis of the surface microbiome from 74 taxa, including teleost fishes, hard and soft corals, crustaceans, echinoderms,...
Tipo: Text
Palavras-chave: Skin microbiota; Phylogenetic diversity; Conservation; Marine biodiversity; Octocorallia; Scleratinia.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74121/73596.pdf

Coral Reef Fish: Not Just a Matter of Beauty!
Provedor de dados: 5
Autores: Boudin, Elyse; Carcaillet, Frédérique; Tribot, Anne-sophie; Carabeux, Quentin; Deter, Julie; Claverie, Thomas; Villéger, Sébastien; Mouquet, Nicolas.
Coral reefs are vulnerable ecosystems where a great number of fish species live. Some fish are beautiful, and some are not. This study compared the human perception of fish beauty with the ecological roles and characteristics of these fishes. It appears that ugly fish have a wider variety of roles in the coral reef ecosystem than beautiful fish do. This means that the ugly fish seem to be more important for ecosystems. The results of this study warn us about the need to preserve not just cute fishes, but the entire ecosystem, which means protecting the ugly fish as well as the beautiful ones.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74183/73786.pdf

An attribute-diversity approach to functional diversity, functional beta diversity, and related (dis)similarity measures
Provedor de dados: 5
Autores: Chao, Anne; Chiu, Chun-huo; Villéger, Sébastien; Sun, I-fang; Thorn, Simon; Lin, Yi-ching; Chiang, Jyh-min; Sherwin, William B.
Based on the framework of attribute diversity (a generalization of Hill numbers of order q), we develop a class of functional diversity measures sensitive not only to species abundances but also to trait‐based species‐pairwise functional distances. The new method refines and improves on the conventional species‐equivalent approach in three areas: (1) the conventional method often gives similar values (close to unity) to assemblages with contrasting levels of functional diversity; (2) when a distance metric is unbounded, the conventional functional diversity depends on the presence/absence of other assemblages in the study; (3) in partitioning functional gamma diversity into alpha and beta components, the conventional gamma is sometimes less than alpha. To...
Tipo: Text
Palavras-chave: Attribute diversity; Diversity decomposition; Functional (dis)similarity; Functional beta diversity; Functional diversity; Hill numbers; Quadratic entropy; Species diversity; Species traits; Trait diversity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60082/63408.pdf

Global changes threaten functional and taxonomic diversity of insular species worldwide
Provedor de dados: 5
Autores: Leclerc, Camille; Villéger, Sébastien; Marino, Clara; Bellard, Céline; Di Minin, Enrico.
Aim The assessment of biodiversity patterns under global changes is currently biased towards taxonomic diversity, thus overlooking the ecological and functional aspects of species. Here, we characterized both taxonomic and functional diversity of insular biodiversity threatened by multiple threats. Location Worldwide islands (n = 4,348). Methods We analysed the relative importance of eleven major threats, including biological invasions or climate change, on 2,756 insular endemic mammals and birds. Species were functionally described using five ecological traits related to diet, habitat and body mass. We computed complementary taxonomic and functional diversity indices (richness, specialization, originality and vulnerability) of species pools affected by...
Tipo: Text
Palavras-chave: Birds; Functional originality; Functional richness; Functional specialization; Islands; Mammals; Species traits; Vulnerability.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71949/70648.pdf

Trait structure and redundancy determine sensitivity to disturbance in marine fish communities
Provedor de dados: 5
Autores: Mclean, Matthew; Auber, Arnaud; Graham, Nicholas A J; Houk, Peter; Villéger, Sébastien; Violle, Cyrille; Thuiller, Wilfried; Wilson, Shaun K.; Mouillot, David.
‘Functional’ diversity is believed to influence ecosystem dynamics through links between organismal traits and ecosystem processes. Theory predicts that key traits and high trait redundancy – large species richness and abundance supporting the same traits – can buffer communities against environmental disturbances. While experiments and data from simple ecological systems lend support, large‐scale evidence from diverse, natural systems under major disturbance is lacking. Here, using long‐term data from both temperate (English Channel) and tropical (Seychelles Islands) fishes, we show that sensitivity to disturbance depends on communities’ initial trait structure and initial trait redundancy. In both ecosystems, we found that increasing dominance by...
Tipo: Text
Palavras-chave: Climate change; Coral reefs; Diversity stability; Ecological traits; Ecosystem functioning; English Channel; Functional diversity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00490/60184/63525.pdf

A global database for metacommunity ecology, integrating species, traits, environment and space
Provedor de dados: 5
Autores: Jeliazkov, Alienor; Mijatovic, Darko; Chantepie, Stéphane; Andrew, Nigel; Arlettaz, Raphaël; Barbaro, Luc; Barsoum, Nadia; Bartonova, Alena; Belskaya, Elena; Bonada, Núria; Brind'Amour, Anik; Carvalho, Rodrigo; Castro, Helena; Chmura, Damian; Choler, Philippe; Chong-seng, Karen; Cleary, Daniel; Cormont, Anouk; Cornwell, William; De Campos, Ramiro; De Voogd, Nicole; Doledec, Sylvain; Drew, Joshua; Dziock, Frank; Eallonardo, Anthony; Edgar, Melanie J.; Farneda, Fábio; Hernandez, Domingo Flores; Frenette-dussault, Cédric; Fried, Guillaume; Gallardo, Belinda; Gibb, Heloise; Gonçalves-souza, Thiago; Higuti, Janet; Humbert, Jean-yves; Krasnov, Boris R.; Saux, Eric Le; Lindo, Zoe; Lopez-baucells, Adria; Lowe, Elizabeth; Marteinsdottir, Bryndis; Martens, Koen; Meffert, Peter; Mellado-díaz, Andres; Menz, Myles H. M.; Meyer, Christoph F. J.; Miranda, Julia Ramos; Mouillot, David; Ossola, Alessandro; Pakeman, Robin; Pavoine, Sandrine; Pekin, Burak; Pino, Joan; Pocheville, Arnaud; Pomati, Francesco; Poschlod, Peter; Prentice, Honor C.; Purschke, Oliver; Raevel, Valerie; Reitalu, Triin; Renema, Willem; Ribera, Ignacio; Robinson, Natalie; Robroek, Bjorn; Rocha, Ricardo; Shieh, Sen-her; Spake, Rebecca; Staniaszek-kik, Monika; Stanko, Michal; Tejerina-garro, Francisco Leonardo; Braak, Cajo Ter; Urban, Mark C.; Klink, Roel Van; Villéger, Sébastien; Wegman, Ruut; Westgate, Martin J.; Wolff, Jonas; Żarnowiec, Jan; Zolotarev, Maxim; Chase, Jonathan M.
The use of functional information in the form of species traits plays an important role in explaining biodiversity patterns and responses to environmental changes. Although relationships between species composition, their traits, and the environment have been extensively studied on a case-by-case basis, results are variable, and it remains unclear how generalizable these relationships are across ecosystems, taxa and spatial scales. To address this gap, we collated 80 datasets from trait-based studies into a global database for metaCommunity Ecology: Species, Traits, Environment and Space; “CESTES”. Each dataset includes four matrices: species community abundances or presences/absences across multiple sites, species trait information, environmental...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71606/70047.pdf

Ecological Specialization Within a Carnivorous Fish Family Is Supported by a Herbivorous Microbiome Shaped by a Combination of Gut Traits and Specific Diet
Provedor de dados: 5
Autores: Escalas, Arthur; Auguet, Jean-christophe; Avouac, Amandine; Seguin, Raphaël; Gradel, Antoine; Borrossi, Lucie; Villéger, Sébastien.
Animals have been developing key associations with micro-organisms through evolutionary processes and ecological diversification. Hence, in some host clades, phylogenetic distance between hosts is correlated to dissimilarity in microbiomes, a pattern called phylosymbiosis. Teleost fishes, despite being the most diverse and ancient group of vertebrates, have received little attention from the microbiome perspective and our understanding of its determinants is currently limited. In this study, we assessed the gut microbiome of 12 co-occurring species of teleost representing a large breadth of ecological diversity and originating from a single family (i.e., the Sparidae). We tested how host evolutionary history, diet composition and morphological traits are...
Tipo: Text
Palavras-chave: Fish gut microbiome; Sparidae; Phylosymbiosis; Morphological traits; Diet; Herbivory; Ecological outlier.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00682/79408/81955.pdf