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Auteur (up) Clavier, J.; Chauvaud, L.; Carlier, A.; Amice, E.; van der Geest, M.; Labrosse, P.; Diagne, A.; Hily, C. url  openurl
  Titre Aerial and underwater carbon metabolism of a Zostera noltii seagrass bed in the Banc d'Arguin, Mauritania Type Article scientifique
  Année 2011 Publication Revue Abrégée Aquatic Botany  
  Volume 95 Numéro Pages 24-30  
  Mots-Clés Zostera noltii Seagrass Metabolism Intertidal Respiration Primary production Africa Isotope wadden sea marine angiosperms seasonal-variation coastal lagoon hornem photosynthesis oxygen respiration dynamics dioxide  
  Résumé Community respiration and primary production were measured in a dense intertidal Zostera noltii bed on the Banc d'Arguin, Mauritania (West Africa) under aerial and submerged conditions. Metabolism was studied in situ in dark and transparent benthic chambers. CO(2) fluxes in the air were measured over a series of short-term incubations (3 min) using an infrared gas analyzer. Dissolved inorganic carbon fluxes were calculated from concentration changes during one-hour underwater incubations. Air and underwater irradiance levels were measured every minute throughout the experiments. Carbon respiration was lower in the air (2.2 mmol m(-2) h(-1)) than underwater (5.0 mmol m(-2) h(-1)); similarly, a production-irradiance model fitted to the data indicated that gross maximal photosynthetic rate was markedly lower during emergence (6.0 mmol C m(-2) h(-1)) than under water (42.7 mmol C m(-2) h(-1)). The delta(13)C values observed in shoots indicated a decrease in atmospheric CO(2) contribution, compared to dissolved inorganic carbon, in Z. noltii metabolism along a depth gradient within a single location. As the seagrass bed remains under a thin layer of water at low tide at the studied site, the large difference in primary production can be mainly attributed to photosynthesis inhibition by high pH and oxygen concentration, as well as to the negative feedback of self-shading by seagrass leaves during emersion. The observed differences in respiration can be explained by the oxygen deficit at night during low tide near the sediment surface, a deficit that is consistent with the abundance of anoxia-tolerant species. (C) 2011 Elsevier B.V. All rights reserved.  
  Adresse [Clavier, Jacques] IUEM, CNRS, UMR 6539, LEMAR,Lab Sci Environm Marin, F-29280 Plouzane, France. [Van der Geest, Matthijs] NIOZ, Dept Marine Ecol, NL-1790 AB Den Burg, Netherlands. [Labrosse, Pierre; Diagne, Ahmed] IMROP, Nouadhibou, Mauritania. Clavier, J (reprint author), IUEM, CNRS, UMR 6539, LEMAR,Lab Sci Environm Marin, Pl Nicolas Copernic, F-29280 Plouzane, France. Jacques.Clavier@univ-brest.fr  
  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 0304-3770 ISBN Médium  
  Région Expédition Conférence  
  Notes ISI Document Delivery No.: 781BF Times Cited: 2 Cited Reference Count: 72 Clavier, Jacques Chauvaud, Laurent Carlier, Antoine Amice, Erwan Van der Geest, Matthijs Labrosse, Pierre Diagne, Ahmed Hily, Christian Franco-Mauritanian PACOBA project; Oceanographic and Fisheries Research Mauritanian Institute (IMROP); Banc d'Arguin National Park (PNBA) This study was funded by the Franco-Mauritanian PACOBA project. We thank the Oceanographic and Fisheries Research Mauritanian Institute (IMROP) and the Banc d'Arguin National Park (PNBA) for their support. Elsevier science bv Amsterdam Approuvé pas de  
  Numéro d'Appel MARBEC @ alain.herve @ 847 collection 1369  
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