The effect of a toxic dinoflagellate (Alexandrium tamarense) on the oxygen uptake of juvenile filter-feeding bivalve molluscs |
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| Affiliation: | 1. Laboratoire des Sciences de l''Environnement Marin LEMAR-UMR6539, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Place Copernic, Technopôle Brest-Iroise, 29280 Plouzané, France;2. Ifremer, Station de Biologie Marine, Place de la Croix, 29185 Concarneau, France;3. Ifremer, Dyneco/Pelagos, ZI de la Pointe du Diable, CS10070, 29280 Plouzané, France;1. Ifremer, DYNECO PELAGOS, 29280 Plouzané, France;2. Laboratoire Mer Molécule Santé, Le Mans Université, 72000 Le Mans, France;3. Laboratoire des Sciences de l''Environnement Marin, UMR 6539 CNRS/UBO – Institut Universitaire Européen de la Mer, Technopôle Brest-Iroise, 29280 Plouzané, France |
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| Abstract: | - 1.1. Oxygen uptake and grazing rates of juvenile bivalve molluscs Mytilus edulis, Mya arenaria, Geukensia demissa, Placopecten magellanicus and Crassostrea virginica were measured following 1 hr exposure to bloom concentrations (106 cells/1) of the toxic dinoflagellate Alexandrium tamarense (GT429) using a non-toxic clone of the same species (PLY 173) as control.
- 2.2. For all bivalves, prefeeding estimates of V̇O2 were similar to postfeeding values and values recorded 24 hr after exposure to bloom conditions.
- 3.3. V̇O2 was similar for bivalves fed on both the toxic and non-toxic strains of A. tamarense suggesting that there were no adverse effects on V̇O2 following 1 hr exposure to toxic GT429.
- 4.4. Bivalves differed in their rates of grazing between toxic GT429 and non-toxic PLY 173. Similar grazing rates were recorded for M. edulis and G. demissa. For P. magellanicus and M. arenaria reduced rates of clearance were recorded in GT429 compared with the non-toxic strain.
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