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Auteur (up) Rossi, F.; Colao, E.; Martinez, M.J.; Klein, J.C.; Carcaillet, F.; Callier, M.D.; De Wit, R.; Caro, A. url  doi
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  Titre Spatial distribution and nutritional requirements of the endosymbiont-bearing bivalve Loripes lacteus (sensu Poli, 1791) in a Mediterranean Nanozostera noltii (Hornemann) meadow Type Article scientifique
  Année 2013 Publication Revue Abrégée Journal of Experimental Marine Biology and Ecology  
  Volume 440 Numéro Pages 108-115  
  Mots-Clés bacteria; Bivalve; codakia-orbicularis; food web; lucinoma-aequizonata; marine-invertebrates; mediterranean; new-zealand fjords; production; Seagrass; seagrass habitats; secondary; solemya-velum; Stable isotopes; sulfide-rich habitats; Symbiosis; thalassia-testudinum  
  Résumé Sulphur-oxidising endosymbiont-bearing bivalves often inhabit seagrass meadows, where they can control sulphide levels and variably contribute to carbon cycling, by feeding on endosymbiotic bacteria and/or on particulate organic matter from the water column. The patterns of variability in their feeding mode and their spatial distribution within the seagrass meadows are however poorly studied. Seagrass beds form naturally patchy habitats with seagrass-sand edges that may have variable effects on different organisms. The present study aims at understanding differences in feeding mode and abundance of the endosymbiont-bearing bivalve Loripes lacteus (sensu Poli, 1791) as well as the physiological conditions of its endosymbiotic populations between edge and inner portion of meadows of the eelgrass Nanozostera noltii (Hornemann). In July 2010, Loripes specimens were sampled in 4 eelgrass patches at 2 different locations in the Thau lagoon, South of France. There was a clear negative edge effect on the abundance of small individuals of Loripes, while large individuals were homogeneously distributed between edge and inner part of the meadow. Although Loripes isotopic signatures (delta C-13 and delta N-15) were always closer to those of its symbiotic bacteria than to those of suspension-feeding bivalves, eelgrass edge enhanced mixotrophic behaviour of small animals, which assimilated less bacterial carbon and nitrogen at the edge than in the inner part of the eelgrass meadow. No differences related to eelgrass edges were instead found for the bacterial populations harboured by Loripes. Rather, flow cytometry revealed large variability at small spatial scales. Although bacteria were always important for the nutrition of Loripes, these findings showed that seagrass edges may contribute to regulate feeding mode and population structure of Loripes, which may have implications for seagrass functioning. (C) 2012 Elsevier B.V. All rights reserved.  
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  Langue English Langue du Résumé Titre Original  
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  ISSN 0022-0981 ISBN Médium  
  Région Expédition Conférence  
  Notes <p>ISI Document Delivery No.: 105SJ<br/>Times Cited: 0<br/>Cited Reference Count: 57<br/>Rossi, Francesca Colao, Elodie Jose Martinez, Maria Klein, Judith C. Carcaillet, Frederique Callier, Myriam D. de Wit, Rutger Caro, Audrey<br/>Ec2co<br/>The authors wish to thank Patrice Got for its support in cytometric analyses. This work was partly supported by the EC2CO funded project “Le Cycle du carbone dans les reseaux trophiques des Herbiers face a l' Augmentation de la tempeRature et des sels nutritifs dans les lagunes Mediterraneennes (CHARM)” attributed to FR. [ST]<br/>Elsevier science bv<br/>Amsterdam</p> Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 965  
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