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Auteur McLean, M.; Mouillot, D.; Villeger, S.; Graham, N.A.J.; Auber, A.
Titre Interspecific differences in environmental response blur trait dynamics in classic statistical analyses Type Article scientifique
Année 2019 Publication (down) Revue Abrégée Mar. Biol.
Volume 166 Numéro 12 Pages 152
Mots-Clés climate-change; community composition; ecology; framework; functional diversity; impact; rules
Résumé 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 drastically different results than standard community-level methods. By demonstrating the potential impacts of interspecific differences on trait dynamics, we illuminate a major, yet rarely discussed issue, highlighting how analytical misinterpretations can confound our basic understanding of trait responses, which could have important consequences for biodiversity conservation.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0025-3162 ISBN Médium
Région Expédition Conférence
Notes WOS:000496131000001 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2660
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Auteur Thomas, F.; Dittami, S.M.; Brunet, M.; Le Duff, N.; Tanguy, G.; Leblanc, C.; Gobet, A.
Titre Evaluation of a new primer combination to minimize plastid contamination in 16S rDNA metabarcoding analyses of alga-associated bacterial communities Type Article scientifique
Année Publication (down) Revue Abrégée Environ. Microbiol. Rep.
Volume Numéro Pages
Mots-Clés diversity; phylogenetic analysis; ribosomal-rna sequences; surfaces
Résumé Plant- and alga-associated bacterial communities are generally described via 16S rDNA metabarcoding using universal primers. As plastid genomes encode 16S rDNA related to cyanobacteria, these data sets frequently contain >90% plastidial sequences, and the bacterial diversity may be under-sampled. To overcome this limitation we evaluated in silico the taxonomic coverage for four primer combinations targeting the 16S rDNA V3-V4 region. They included a forward primer universal to Bacteria (S-D-Bact-0341-b-S-17) and four reverse primers designed to avoid plastid DNA amplification. The best primer combination (NOCHL) was compared to the universal primer set in the wet lab using a synthetic community and samples from three macroalgal species. The proportion of plastid sequences was reduced by 99%-100% with the NOCHL primers compared to the universal primers, irrespective of algal hosts, sample collection and extraction protocols. Additionally, the NOCHL primers yielded a higher richness while maintaining the community structure. As Planctomycetes, Verrucomicrobia and Cyanobacteria were underrepresented (70%-90%) compared to universal primers, combining the NOCHL set with taxon-specific primers may be useful for a complete description of the alga-associated bacterial diversity. The NOCHL primers represent an innovation to study algal holobionts without amplifying host plastid sequences and may further be applied to other photosynthetic hosts.
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Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 1758-2229 ISBN Médium
Région Expédition Conférence
Notes WOS:000498132200001 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2661
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Auteur Aubé, J.; Senin, P.; Pringault, O.; Bonin, P.; Deflandre, B.; Bouchez, O.; Bru, N.; Biritxinaga-Etchart, E.; Klopp, C.; Guyoneaud, R.; Goñi-Urriza, M.
Titre The impact of long-term hydrocarbon exposure on the structure, activity, and biogeochemical functioning of microbial mats Type Article scientifique
Année 2016 Publication (down) Revue Abrégée Marine Pollution Bulletin
Volume 111 Numéro 1 Pages 115-125
Mots-Clés Biogeochemical functioning; diversity; Hydrocarbonoclastic bacteria; Microbial mats
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Volume de collection Numéro de collection Edition
ISSN 0025-326x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2155
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Auteur Durant, J.M.; Molinero, J.-C.; Ottersen, G.; Reygondeau, G.; Stige, L.C.; Langangen, O.
Titre Contrasting effects of rising temperatures on trophic interactions in marine ecosystems Type Article scientifique
Année 2019 Publication (down) Revue Abrégée Sci Rep
Volume 9 Numéro Pages 15213
Mots-Clés biodiversity; calanus-finmarchicus; climate-change; fluctuations; life-history; mallotus-villosus; match; mismatch; phenology; thermal tolerance
Résumé In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted to this pattern by synchronising life-history events such as reproduction with prey availability. However, changing temperatures may pose unprecedented challenges by decoupling the predator-prey interactions. Here we build a predator-prey model accounting for the full life-cycle of fish and zooplankton including their phenology. The model assumes that fish production is bottom-up controlled by zooplankton prey abundance and match or mismatch between predator and prey phenology, and is parameterised based on empirical findings of how climate influences phenology and prey abundance. With this model, we project possible climate-warming effects on match-mismatch dynamics in Arcto-boreal and temperate biomes. We find a strong dependence on synchrony with zooplankton prey in the Arcto-boreal fish population, pointing towards a possible pronounced population decline with warming because of frequent desynchronization with its zooplankton prey. In contrast, the temperate fish population appears better able to track changes in prey timing and hence avoid strong population decline. These results underline that climate change may enhance the risks of predator-prey seasonal asynchrony and fish population declines at higher latitudes.
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Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 2045-2322 ISBN Médium
Région Expédition Conférence
Notes WOS:000491859500003 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2668
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Auteur Tran, T.T.V.; Phan, L.K.; Durand, J.-D.
Titre Diversity and distribution of cryptic species within the Mugil cephalus species complex in Vietnam Type Article scientifique
Année 2017 Publication (down) Revue Abrégée Mitochondrial DNA Part A
Volume 28 Numéro 4-5 Pages 493-501
Mots-Clés Cryptic species; cytochrome b; cytochrome oxidase I; divergence; genetic diversity; marginal seas; mitochondrial phylogeny; northwestern pacific; phylogeography; pleistocene isolation; population-growth; striped mullet; teleostei mugilidae
Résumé Mugil cephalus sensu lato is a globally distributed complex of cryptic species whose distribution range and evolutionary history remains largely unknown. In the North West (NW) Pacific three species have been identified genetically among fish described morphologically as M. cephalus. Their distribution ranges are largely parapatric and has been proposed to mirror different thermal preferences. To date, few samples have been analyzed from South China Sea, which limits inferences on the evolutionary history of the species complex. We sampled fish identified morphologically as M. cephalus along Vietnamese shores and characterized them using the sequence polymorphism of two mitochondrial genes, the cytochrome oxidase I and cytochrome b. This demonstrated that all three species described in the NW Pacific are present in both northern and southern Vietnamese waters. Although the difference in species abundance reflects those observed in the NW Pacific, no phylogeographic pattern was revealed. In addition, no population structure was observed whatever the species or the distribution range considered, which indicates a significant level of gene flow that maintains genetic homogeneity of the three species. It is also conceivable that each species experienced a recent population expansion from a single ancestral population. Finally we suggest that if the cold waters of the NW Pacific present a physiologic challenge leading to the almost parapatric distribution of the three species, then it is likely that the warm surface temperatures of the South China Sea negate this barrier.
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Volume de collection Numéro de collection Edition
ISSN 2470-1394 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2160
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