Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 2 2009 10.5194/bg-6-157-2009 http://www.biogeosciences.net/6/157/2009/ http://www.biogeosciences.net/6/157/2009/bg-6-157-2009.html http://www.biogeosciences.net/6/157/2009/bg-6-157-2009.pdf 157 170 2009-02-10 High frequency Barium profiles in shells of the Great Scallop <i>Pecten maximus</i>: a methodical long-term and multi-site survey in Western Europe A. Barats D. Amouroux david.amouroux@univ-pau.fr L. Chauvaud C. Pécheyran A. Lorrain J. Thébault T. M. Church O. F. X. Donard Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) – Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux (IPREM), UMR 5254 CNRS – Université de Pau et des Pays de l'Adour (UPPA), Hélioparc Pau-Pyré Laboratoire des sciences de l'Environnement MARin (LEMAR) – Institut Universitaire Européen de la Mer (IUEM), UMR 6539 CNRS – Université de Bretagne Occidentale (UBO), Technopole Brest-Iroise, Place Nicolas Copernic, 29280 Plouzané, France Institut de Recherche pour le Développement (IRD) – Laboratoire des sciences de l'Environnement MARin (LEMAR), Centre IRD de Brest, BP 70, 29280 Plouzané, France College of Marine and Earth Studies, University of Delaware, Newark, Delaware, 19716-3501, USA now at: Laboratoire de Radiochimie et des Sciences Analytiques et Environnement (LRSAE/EA 1175) – Université de Nice Sophia Antipolis (UNSA), 28 avenue Valrose, 06108 Nice Cedex 2, France now at: Johannes Gutenberg University, Institute of Geosciences, Department of Applied and Analytical Paleontology, Johann-Joachim-Becher-Weg 21, 55099 Mainz, Germany Skeletal barium/calcium ([Ba]/[Ca])_shell ratios were measured every third daily striae in 39 flat valves of the Great Scallop <i>Pecten maximus</i> collected in temperate coastal environments of Western Europe. A methodical evaluation of the ([Ba]/[Ca])_shell ratio was performed for the first time and demonstrates that ([Ba]/[Ca])_shell profiles are reproducible for several scallop individuals from the same population (2-year old; 3 shells/year), over a 7-year period (1998–2004), and from different coastal environments in France (42–49&deg; N). As previously determined in the shells of other bivalve species, ([Ba]/[Ca])_shell profiles generally exhibited a background ratio punctuated by two transient maxima occurring in early and late summer. Background partition coefficient (D_Ba=0.11&plusmn;0.03, in 2000) was similar to that previously reported in <i>P. maximus</i> shells, suggesting a direct shell uptake of dissolved seawater Ba (Gillikin et al., 2008). The 7-year survey in the Bay of Brest of the high frequency ([Ba]/[Ca])_shell profiles in the scallop's shell was exploited to better constrain both the occurrence and the amplitude of the summer Ba relative enrichments as influenced by environmental processes. Seawater Ba contents in 2000 underlined significant particulate Ba inputs at the sediment water interface (SWI) during ([Ba]/[Ca])_shell peak events. These Ba inputs are thus suggested to be subsequently induced by a pelagic biogenic process, which mainly occurs under summer post-bloom conditions in relationship to the cycling of particulate organic matter and associated Ba. The long term survey reveals that such pelagic Ba cycling processes are responsible for particulate Ba inputs to the sediment water interface (SWI). Subsequent indirect Ba uptake by the bivalve results in higher ([Ba]/[Ca])_shell ratios, in that archived Ba within the shell cannot be used as a direct paleo productivity tracer. Our methodical approach, based on a multi-year and multi-site-survey of ([Ba]/[Ca])_shell ratio in Scallop bivalves, allows us to establish the potential application of such high frequency archives for further biogeochemical and ecological investigations of bivalves in the coastal environment. % vor jede Referenz Alldredge, A. L., Gotschalk, C., Passow, U., and Riebesell, U.: Mass aggregation of diatom blooms: Insights from a mesocosm study, Deep-Sea Res., Pt. 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