bascule de visibilité Search & Display Options

Tout Sélectionner    Désélectionner
 |   | 
Détails
   print
  Enregistrements Liens
Auteur Pool, T.K.; Grenouillet, G.; Villeger, S. url  doi
openurl 
  Titre Species contribute differently to the taxonomic, functional, and phylogenetic alpha and beta diversity of freshwater fish communities Type Article scientifique
  Année 2014 Publication (down) Revue Abrégée Diversity and Distributions  
  Volume 20 Numéro 11 Pages 1235-1244  
  Mots-Clés Beta diversity; fish conservation; functional and phylogenetic diversity  
  Résumé  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 1472-4642 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1172  
Lien permanent pour cet enregistrement
 

 
Auteur Toussaint, A.; Beauchard, O.; Oberdorff, T.; Brosse, S.; Villeger, S. url  doi
openurl 
  Titre Historical assemblage distinctiveness and the introduction of widespread non-native species explain worldwide changes in freshwater fish taxonomic dissimilarity Type Article scientifique
  Année 2014 Publication (down) Revue Abrégée Global Ecology and Biogeography  
  Volume 23 Numéro 5 Pages 574-584  
  Mots-Clés Beta diversity; differentiation; freshwater fish; homogenization; macroecology; partitioning; turnover  
  Résumé  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 1466-8238 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1174  
Lien permanent pour cet enregistrement
 

 
Auteur Triki, H.Z.; Daly-Yahia, O.K.; Malouche, D.; Komiha, Y.; Deidun, A.; Brahim, M.; Laabir, M. url  doi
openurl 
  Titre Distribution of resting cysts of the potentially toxic dinoflagellate Alexandrium pseudogonyaulax in recently-deposited sediment within Bizerte Lagoon (Mediterranean coast, Tunisia) Type Article scientifique
  Année 2014 Publication (down) Revue Abrégée Marine Pollution Bulletin  
  Volume 84 Numéro 1-2 Pages 172-181  
  Mots-Clés Alexandrium pseudogonyaulax; autocorrelation; bay; Benthic; blooms; cysts; dynamics; eutrophication; gonyaulax-excavata; gulf; Harmful algae; Mapping; Mediterranean Lagoon of Bizerte; resting cysts; Sediment characteristics; spatial-distribution; surface sediments  
  Résumé This study investigated the spatial distribution of Alexandrium pseudogonyaulax resting cysts in recently-deposited sediment of Bizerte lagoon (South-Western Mediterranean, Tunisia). This lagoon is the subject of many anthropogenic impacts, such as holding important fishing and aquaculture activities. A. pseudogonyaulax has been shown to produce Goniodomin A, which is a biologically-active compound. We showed that this dinoflagellate produces two types of resting cysts, which could be distinguished by the presence or the absence of a paratabulate wall. The average cyst density across the whole lagoon was rather high, reaching 639 cysts g(-1) of dry sediment (DS). Cyst densities varied widely among the sampled stations, with the highest density of 1685 cyst g(-1) DS being recorded at station 51 near a mussel farm. With respect to sediment characteristics, the highest cyst densities were found within silty sediments with high water content values. The distribution of A. pseudongoyaulax cysts in Bizerte lagoon appears to be related to hydrodynamic factors. (C) 2014 Elsevier Ltd. All rights reserved.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0025-326x ISBN Médium  
  Région Expédition Conférence  
  Notes <p>ISI Document Delivery No.: AL0GF<br/>Times Cited: 0<br/>Cited Reference Count: 45<br/>Triki, Habiba Zmerli Daly-Yahia, Ons Kefi Malouche, Dhafer Komiha, Yosr Deidun, Alan Brahim, Mouldi Iaabir, Mohamed<br/>JEAI ECO-BIZ (Jeune Equipe Associee, Ecologie de la lagune de Bizerte) program – IRD (Institut Francais pour la Recherche et le Developpement), IRD; TOTAL Foundation<br/>This work benefitted from financial supports from the JEAI ECO-BIZ (Jeune Equipe Associee, Ecologie de la lagune de Bizerte) program funded by IRD (Institut Francais pour la Recherche et le Developpement), IRD also funded 2 months stay of Dr. Mohamed Laabir in Tunis (INAT). Thanks to TOTAL Foundation for funding LAGUNOTOX project which supported financially the stay of Mrs Triki-Zmerli in Montpellier.<br/>Pergamon-elsevier science ltd<br/>Oxford</p> Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1175  
Lien permanent pour cet enregistrement
 

 
Auteur Villeger, S.; Grenouillet, G.; Brosse, S. url  doi
openurl 
  Titre Functional homogenization exceeds taxonomic homogenization among European fish assemblages Type Article scientifique
  Année 2014 Publication (down) Revue Abrégée Global Ecology and Biogeography  
  Volume 23 Numéro 12 Pages 1450-1460  
  Mots-Clés beta-diversity; exotic species; functional diversity; Non-native species; taxonomic dissimilarity; translocation  
  Résumé Aim Human activities and the consequent extirpations of native species and introductions of non-native species have been modifying the composition of species assemblages throughout the world. These anthropogenic impacts have modified the richness of assemblages as well as the biological dissimilarity among them. However, while changes in taxonomic dissimilarity (i.e. accounting for species composition) have been assessed intensively during the last decade there are still few assessments of changes in functional dissimilarity (i.e. accounting for the diversity of biological traits). Here, we assess the temporal changes in both taxonomic and functional dissimilarities for freshwater fish assemblages across Europe. Location Western Palaearctic, 137 river basins. Methods The Jaccard index was used to quantify the changes in both taxonomic and functional dissimilarity. We then partitioned dissimilarity to extract its turnover component and measured the changes in the contribution of turnover to dissimilarity. Results Functional homogenization exceeded taxonomic homogenization six-fold. More importantly, we found only a moderate positive correlation between these changes. For instance, 40% of assemblages that experienced taxonomic differentiation were actually functionally homogenized. Taxonomic and functional homogenizations were stronger when the historical level of taxonomic dissimilarity among assemblages was high and when a high number of non-native species were introduced in the assemblages. Moreover, translocated species (i.e. non-native species originating from Europe) played a stronger role than exotic species (i.e. those coming from outside Europe) in this homogenization process, while extirpation did not play a significant role. Main conclusions Change in taxonomic diversity cannot be used to predict changes in functional diversity. In addition, as functional diversity has been proven to be a better indicator of ecosystem functioning and stability than taxonomic diversity, further studies are required to test the potential effects of functional homogenization at the local scale.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 1466-8238 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1178  
Lien permanent pour cet enregistrement
 

 
Auteur Zhao, T.; Villeger, S.; Lek, S.; Cucherousset, J. url  doi
openurl 
  Titre High intraspecific variability in the functional niche of a predator is associated with ontogenetic shift and individual specialization Type Article scientifique
  Année 2014 Publication (down) Revue Abrégée Ecology and Evolution  
  Volume 4 Numéro 24 Pages 4649-4657  
  Mots-Clés functional traits; niche; ontogeny; overlap; stable isotope analyses  
  Résumé Investigations on the functional niche of organisms have primarily focused on differences among species and tended to neglect the potential effects of intraspecific variability despite the fact that its potential ecological and evolutionary importance is now widely recognized. In this study, we measured the distribution of functional traits in an entire population of largemouth bass (Micropterus salmoides) to quantify the magnitude of intraspecific variability in functional traits and niche (size, position, and overlap) between age classes. Stable isotope analyses (δ13C and δ15N) were also used to determine the association between individual trophic ecology and intraspecific functional trait variability. We observed that functional traits were highly variable within the population (mean coefficient variation: 15.62% ± 1.78% SE) and predominantly different between age classes. In addition, functional and trophic niche overlap between age classes was extremely low. Differences in functional niche between age classes were associated with strong changes in trophic niche occurring during ontogeny while, within age classes, differences among individuals were likely driven by trophic specialization. Each age class filled only a small portion of the total functional niche of the population and age classes occupied distinct portions in the functional space, indicating the existence of ontogenetic specialists with different functional roles within the population. The high amplitude of intraspecific variability in functional traits and differences in functional niche position among individuals reported here supports the recent claims for an individual-based approach in functional ecology.  
  Adresse  
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 2045-7758 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ collection 1183  
Lien permanent pour cet enregistrement
Tout Sélectionner    Désélectionner
 |   | 
Détails
   print

Save Citations:
Export Records: