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Auteur Blanchet, M.; Pringault, O.; Panagiotopoulos, C.; Lefevre, D.; Charriere, B.; Ghiglione, J.-F.; Fernandez, C.; Aparicio, F.L.; Marrase, C.; Catala, P.; Oriol, L.; Caparros, J.; Joux, F. doi  openurl
  Titre When riverine dissolved organic matter (DOM) meets labile DOM in coastal waters: changes in bacterial community activity and composition Type Article scientifique
  Année 2017 Publication Revue Abrégée Aquat. Sci.  
  Volume 79 Numéro 1 Pages 27-43  
  Mots-Clés Bacterial community composition; bacterioplankton; biodegradation; carbon; coastal waters; Dissolved organic matter; Fluorescence; growth efficiency; lake water; marine; Mediterranean Sea; open-ocean; Priming effect; rhone river; terrestrial  
  Résumé Heterotrophic bacterial communities in marine environments are exposed to a heterogeneous mixture of dissolved organic compounds with different bioreactivity that may control both their activity and composition. The coastal environment is an example of a mixing area where recalcitrant allochthonous organic matter from rivers can encounter labile organic matter from marine phytoplanktonic blooms. The objective of this study was to explore the effects of mixed qualities of dissolved organic matter (DOM) on bacterial community activity (BCA) and bacterial community composition (BCC) and to test for a priming effect when DOM sources are added in combination. Coastal marine bacterial communities were incubated separately with a mixture of amino acids and with natural riverine DOM or with both sources together for 42 days. Addition of amino acids alone or in combination with riverine DOM led to a similar stimulation of BCA compared to control condition, whereas addition of riverine DOM alone did not modify BCA compared to the control. On the contrary, BCC analyzed by 16S rRNA gene pyrosequencing was not affected by the addition of amino acids alone, but changed dramatically with riverine DOM alone or in combination with amino acids. Our results show that changes in BCA and BCC can be driven by different types of DOM, but that these changes are not necessarily coupled. Moreover, the addition of labile DOM did not modify the microbial decomposition of riverine DOM, nor the BCC, suggesting that a priming effect did not occur under these experimental conditions.  
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  Langue English Langue du Résumé Titre Original  
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  Volume de collection Numéro de collection Edition  
  ISSN 1015-1621 ISBN Médium  
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Auteur Morat, F.; Letourneur, Y.; Blamart, D.; Pecheyran, C.; Darnaude, A.M.; Harmelin-Vivien, M. url  doi
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  Titre Offshore-onshore linkages in the larval life history of sole in the Gulf of Lions (NW-Mediterranean) Type Article scientifique
  Année 2014 Publication Revue Abrégée Estuarine Coastal and Shelf Science  
  Volume 149 Numéro Pages 194-202  
  Mots-Clés age; bristol channel; common sole; fish otoliths; isotope ratios; microchirus-variegatus; nursery grounds; otolith microchemistry; Rhone River; river flood event; sea; seasonal-variation; shape-analysis; Solea solea; stable isotope  
  Résumé Understanding individual dispersion from offshore natal areas to coastal nurseries during pelagic larval life is especially important for the sustainable management of exploited marine fish species. For several years, the hatching period, the larval life duration, the average growth rate and the otolith chemical composition (delta C-13, delta O-18, Sr:Ca and Ba:Ca) during the larval life were studied for young of the year (YOY) of sole collected in three main nurseries of the Gulf of Lions (GoL) (Thau, Mauguio and Berre). We investigated the spatial variation in the origin of the sole larvae which colonised the nurseries around the GoL, and whether temporal differences in environmental conditions during this life stage affected growth and larval life duration. The hatching period ranges from October to March, depending on year and site. Average ages at metamorphosis varied between 43 and 50 days, with the lowest and highest values consistently found for Mauguio and Berre, respectively. Otolith growth rates ranged between 2.7 and 3.2 mu m d(-1), with the lowest values in Thau and Mauguio and the highest in Berre. Otolith chemical composition during the larval life also varied, suggesting contrasted larval environmental histories in YOY among nurseries. In fishes from Berre and Mauguio, larval life was more influenced by the Rhone River, showing consistently higher larval Ba:Ca ratios (10/23 mu mol mol(-1)) and lower delta C-13 (-6.5/-6.1 parts per thousand) and delta O-18 values (-1.6/0.1 parts per thousand) than for Thau (with Ba:Ca ratios < 8 mu mol mol(-1), delta C-13 similar to-2.3 parts per thousand and delta O-18 similar to 1.5 parts per thousand). Differences in larval otolith composition were observed for 2004, with higher Ba:Ca and lower delta C-13 and delta O-18 values than in the two other years. These differences were explained by changes in composition and chemical signatures of water masses after an exceptional flooding event of the Rhone River in late 2003. (C) 2014 Elsevier Ltd. All rights reserved.  
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  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 0272-7714 ISBN Médium  
  Région Expédition Conférence  
  Notes <p>ISI Document Delivery No.: AW3ZF<br/>Times Cited: 0<br/>Cited Reference Count: 75<br/>Morat, Fabien Letourneur, Yves Blamart, Dominique Pecheyran, Christophe Darnaude, Audrey M. Harmelin-Vivien, Mireille<br/>PACA Region; Total foundation; Agence de l'Eau Rhone Mediterranee Corse; French National Research Agency (ANR) through the young scientist program LAGUNEX [07-JCJC-0135]<br/>Fabien Morat was funded by Ph.D stipends from the PACA Region, the Total foundation, and the Agence de l'Eau Rhone Mediterranee Corse and by the French National Research Agency (ANR) through the young scientist program LAGUNEX (07-JCJC-0135). We thank Jean-Pierre Quignard and fishermen for Thau and Mauguio lagoons samples, and Gipreb members for Berre lagoon samples. The authors express their thanks to Christian Marschal and Chantal Mahe-Bezac for their technical help in age estimation, Olivier Radakovitch for elemental data of the Rhone River waters, and Michael Paul, a native English speaker scientific translator, for language correction. We are grateful to anonymous reviewers for their valuable suggestions and criticisms that have enabled us to improve the article.<br/>Academic press ltd- elsevier science ltd<br/>London</p> Approuvé pas de  
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