| Enregistrements |
| Auteur |
Tribot, A.-S.; Deter, J.; Claverie, T.; Guillhaumon, F.; Villeger, S.; Mouquet, N. |
| Titre |
Species diversity and composition drive the aesthetic value of coral reef fish assemblages |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée  |
Biol. Lett. |
| Volume |
15 |
Numéro |
11 |
Pages |
20190703 |
| Mots-Clés |
aesthetics; biodiversity; conservation; coral reef fish; ecosystem services; functional diversity; human interest; landscape; nature's contribution to people; quality |
| Résumé |
Cultural and recreational values of biodiversity are considered as important dimensions of nature's contribution to people. Among these values, the aesthetics can be of major importance as the appreciation of beauty is one of the simplest forms of human emotional response. Using an online survey, we disentangled the effects of different facets of biodiversity on aesthetic preferences of coral reef fish assemblages that are among the most emblematic assemblages on Earth. While we found a positive saturating effect of species' richness on human preference, we found a net negative effect of species abundance, no effect of species functional diversity and contrasting effects of species composition depending on species' attractiveness. Our results suggest that the biodiversity-human interest relationship is more complex than has been previously stated. By integrating several scales of organization, our study is a step forward in better evaluating the aesthetic value of biodiversity. |
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English |
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| ISSN |
1744-9561 |
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WOS:000504840300013 |
Approuvé |
pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
2713 |
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| Auteur |
Evans, S.M.; McKenna, C.; Simpson, S.D.; Tournois, J.; Genner, M.J. |
| Titre |
Patterns of species range evolution in Indo-Pacific reef assemblages reveal the Coral Triangle as a net source of transoceanic diversity |
Type |
Article scientifique |
| Année |
2016 |
Publication |
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Revue Abrégée |
Biol. Lett. |
| Volume |
12 |
Numéro |
6 |
Pages |
20160090 |
| Mots-Clés |
Bayesian skyline plot; biogeography; climate change; coral reef; fishes global patterns; marine biodiversity; ocean; phylogeography; refugia; species distributions |
| Résumé |
The Coral Triangle in the Indo-Pacific is a region renowned for exceptional marine biodiversity. The area could have acted as a 'centre of origin' where speciation has been prolific or a 'centre of survival' by providing refuge during major environmental shifts such as sea-level changes. The region could also have acted as a 'centre of accumulation' for species with origins outside of the Coral Triangle, owing to it being at a central position between the Indian and Pacific oceans. Here, we investigated support for these hypotheses using population-level DNA sequence-based reconstructions of the range evolution of 45 species (314 populations) of Indo-Pacific reef-associated organisms. Our results show that populations undergoing the most ancient establishment were significantly more likely to be closer to the centre of the Coral Triangle than to peripheral locations. The data are consistent with the Coral Triangle being a net source of coral-reef biodiversity for the Indo-Pacific region, suggesting that the region has acted primarily as a centre of survival, a centre of origin or both. These results provide evidence of how a key location can influence the large-scale distributions of biodiversity over evolutionary timescales. |
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English |
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1744-9561 |
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Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1694 |
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| Auteur |
Reichel, K.; Masson, J.-P.; Malrieu, F.; Arnaud-Haond, S.; Stoeckel, S. |
| Titre |
Rare sex or out of reach equilibrium? The dynamics of F-IS in partially clonal organisms |
Type |
Article scientifique |
| Année |
2016 |
Publication |
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Revue Abrégée |
BMC Genet. |
| Volume |
17 |
Numéro |
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Pages |
76 |
| Mots-Clés |
consequences; diversity; evolution; genetic diversity; genetic-structure; Heterozygote excess; hybridization; Inbreeding coefficient; loci; Mating system; microsatellite primers; mutation; Parthenogenesis; Partial asexuality; population-genetics; reproduction |
| Résumé |
Background: Partially clonal organisms are very common in nature, yet the influence of partial asexuality on the temporal dynamics of genetic diversity remains poorly understood. Mathematical models accounting for clonality predict deviations only for extremely rare sex and only towards mean inbreeding coefficient (F-IS) over bar < 0. Yet in partially clonal species, both F-IS < 0 and F-IS > 0 are frequently observed also in populations where there is evidence for a significant amount of sexual reproduction. Here, we studied the joint effects of partial clonality, mutation and genetic drift with a state-and-time discrete Markov chain model to describe the dynamics of F-IS over time under increasing rates of clonality. Results: Results of the mathematical model and simulations show that partial clonality slows down the asymptotic convergence to F-IS = 0. Thus, although clonality alone does not lead to departures from Hardy-Weinberg expectations once reached the final equilibrium state, both negative and positive F-IS values can arise transiently even at intermediate rates of clonality. More importantly, such “transient” departures from Hardy Weinberg proportions may last long as clonality tunes up the temporal variation of F-IS and reduces its rate of change over time, leading to a hyperbolic increase of the maximal time needed to reach the final mean (F-IS,F-infinity) over bar value expected at equilibrium. Conclusion: Our results argue for a dynamical interpretation of F-IS in clonal populations. Negative values cannot be interpreted as unequivocal evidence for extremely scarce sex but also as intermediate rates of clonality in finite populations. Complementary observations (e.g. frequency distribution of multiloci genotypes, population history) or time series data may help to discriminate between different possible conclusions on the extent of clonality when mean (F-IS) over bar values deviating from zero and/or a large variation of F-IS over loci are observed. |
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English |
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1471-2156 |
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Approuvé |
pas de |
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MARBEC @ alain.herve @ |
collection |
1648 |
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| Auteur |
Ben Lamine, Y.; Pringault, O.; Aissi, M.; Ensibi, C.; Mahmoudi, E.; Daly Yahia Kefi, O.; Daly Yahia, M.N. |
| Titre |
Environmental controlling factors of copepod communities in the Gulf of Tunis (south western Mediterranean Sea) |
Type |
Article scientifique |
| Année |
2015 |
Publication |
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Revue Abrégée |
Cahiers de Biologie Marine |
| Volume |
56 |
Numéro |
3 |
Pages |
213-229 |
| Mots-Clés |
Competition; Copepod diversity; multivariate analysis; Salinity; Temperature; Top-down control |
| Résumé |
The copepod community structure and the distribution of the main groups of zooplankton were studied along an inshore-offshore gradient in the Gulf of Tunis during the rainy and dry seasons of 2007-2008. Hydrological parameters were also measured to assess the potential role of abiotic and biotic factors in the distribution of copepod species. The copepod community in the Gulf of Tunis comprises 86 species dominated by Paracalanus parvus, Clausocalanus lividus, Centropages kroyeri and Acartia clausi. Time had a greater influence than space (horizontal and vertical gradients) in shaping the copepod community structure with a significant influence of the seasons; winter (cold and rainy) resulted in hydrological conditions that were strongly different from those observed in summer (warm and dry). These hydrological differences were concomitant with changes in the community structure, with a high copepod diversity observed in winter while the summer period was characterized by a low specific richness and the dominance of a few species, Centropages kroyeri and Paracalanus parvus along the inshore-offshore gradient and Paracalanus aculeatus along the vertical. Canonical correspondence analysis showed that temperature, salinity and to a lesser extent chlorophyll a were the most important environmental factors structuring the copepod community. Interestingly, temperature and salinity showed a negative significant correlation with copepod specific richness. Competition with grazers (cladoceran) as well as top down control by predators (chaetognaths and siphonophors) were also identified as key factors for the copepod community structure. |
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0007-9723 |
ISBN |
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WOS:000358550200003 |
Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
1324 |
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| Auteur |
Goni-Urriza, M.; Moussard, H.; Lafabrie, H.; Carré, C.; Bouvy, M.; Sakka Hlaili, A.; Pringault, O. |
| Titre |
Consequences of contamination on the interactions between phytoplankton and bacterioplankton |
Type |
Article scientifique |
| Année |
2018 |
Publication |
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Revue Abrégée |
Chemosphere |
| Volume |
195 |
Numéro |
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Pages |
212-222 |
| Mots-Clés |
bizerte lagoon; bacterial communities; polycyclic aromatic-hydrocarbons; surface sediments; functional diversity; ecosystem; sediment resuspension; coastal lagoon; nutrient enrichment; tropical lagoon |
| Résumé |
Sediment resuspension can provoke strong water enrichment in nutrients, contaminants, and microorganisms. Microcosm incubations were performed in triplicate for 96 h, with lagoon and offshore waters incubated either with sediment elutriate or with an artificial mixture of contaminants issued from sediment resuspension. Sediment elutriate provoked a strong increase in microbial biomass, with little effects on the phytoplankton and bacterioplankton community structures. Among the pool of contaminants released, few were clearly identified as structuring factors of phytoplanktdn and bacterioplankton communities, namely simazine, Cu, Sn, Ni, and Cr. Effects were more pronounced in the offshore waters, suggesting a relative tolerance of the lagoon microbial communities to contamination. The impacts of contamination on the microbial community structure were direct or indirect, depending on the nature and the strength of the interactions between phytoplankton and bacterioplankton. (C) 2017 Elsevier Ltd. All rights reserved. |
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Lieu de Publication |
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Éditeur |
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English |
Langue du Résumé |
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Titre Original |
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Titre de collection |
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Titre de collection Abrégé |
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Numéro de collection |
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Edition |
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| ISSN |
0045-6535 |
ISBN |
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Médium |
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Expédition |
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Conférence |
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| Notes |
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Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2265 |
| Lien permanent pour cet enregistrement |
