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Interrelations in a microcosm with a suspension-feeder and a deposit-feeder. II: Modeling

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Interrelation in a microcosm with a suspension-feeder and a deposit-feeder. II : Modelling ___________________________________ o_c_E_A_N_O_L_O_G_IC_A __ A_C_TA __ 1_9_90 __ -_v_o_L._1_3_-_N_"_1~~r------- Interrelations in a microcosm with a suspension-feeder Suspension-feeders Deposit-feeders Pollutant Bioturbation Modelization Filtreurs Dépositivores Polluant Bioturbation Modélisation and a deposit-feeder. II: Modelling ABSTRACT RÉSUMÉ INTRODUCTION Jean-Michel AMOUROUX a, Jacques AMOUROUX b, Jean BASTIDE c, Guy CAHET d, Antoine GRÉMARE a a Centre National de la Recherche Scientifique, Laboratoire Arago 66650 Banyuls- sur-Mer, France. b École Nationale Supérieure de Chimie de Paris (ENSCP), Université Pierre-et-Marie- Curie, 4, place Jussieu, 75252 Paris Cedex 05, France. c Institut Universitaire de Technologie, Université de Perpignan, avenue de Villeneuve, 66000 Perpignan, France. d Laboratoire Arago, 66650 Banyuls-sur-Mer, France. Received 29/7/88, in revised fonn 24/4/89, accepted 28/4/89. A microcosm comprising a filter-feeding bivalve (Venerupis decussatus), a deposit- feeding annelid (Eupolymnia nebulosa), a live monospecific suspension and sediment was studied on the basis of a compartmental analysis. The consomption and biodeposi- tion of two different live suspensions of bacteria and algae by Venerupis decussatus were measured. Suspensions was labelled with 14C. A series of experiments of varying duration made it possible to quantify the diffusion of 14C from suspensions to animais and sediment. An analog mode! of radioactivity changes in the different compartments of the system was elaborated. Constants of exchanges of organic matter between compartments, and amounts of organic matter which transited through the different compartments were calculated. Annelids scraped the biodeposits of the bivalves and this bioturbation resulted in the resuspension of such particulate matter. The impact of a poilu tant on the kinetics of exchan

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