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Relationship between valve activity, microalgae concentration in the water and toxin accumulation in the digestive gland of the Pacific oyster Crassostrea gigas exposed to Alexandrium minutum |
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| Authors: | Haberkorn Hansy Tran Damien Massabuau Jean-Charles Ciret Pierre Savar Véronique Soudant Philippe |
| Institution: | a Laboratoire des Sciences de l’Environnement Marin, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, Place Copernic, Technopôle Brest-Iroise, 29280 Plouzané, France b Université Bordeaux 1, CNRS, UMR 5805 EPOC, Place du Dr Peyneau, 33120, Arcachon, France c IFREMER Centre de Nantes, Laboratoire Phycotoxines, BP 21105, 44311 Nantes, France |
| Abstract: | The complexity of the relationships between Alexandrium minutum (A.m.) concentration in the water (A.m.]w), Paralytic Shellfish Poisoning contamination in the digestive gland (PSP]dg) and valve behavior was explored in oysters Crassostrea gigas. Two experiments were conducted, during which oysters’ valve behaviour were analyzed. Oysters, first acclimated for 10-days with the non harmful microalgae Heterocapsa triquetra (H.t.), were exposed to four microalgae mixtures at constant total concentrations of 10 × 103 cells ml−1 (experiment-1) and 5 × 103 cells ml−1 (experiment-2): 100% A.m.; 50% A.m.-50% H.t.; 25% A.m.-75% H.t.; 100% H.t. At the end of experiment-2, PSP]dg were measured.At 10 × 103 cells ml−1, the microalgal ingestion decreased (p < 0.05) with increasing A.m.]w but not at 5 × 103 cells ml−1 (p > 0.05). The frequency of microclosures specifically increased with A.m.]w (p < 0.05) and the opening duration with PSP]dg (p < 0.0001). Oysters exhibiting the maximum increase in opening duration also exhibited the highest PSP]dg. The results are discussed in terms of oyster physiology and origin of the behavioral response. |
| Keywords: | Harmful algae Oysters Behavioral responses Algae concentration Toxin accumulation |
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