Bivalve population health: Multistress to identify hot spots |
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| Authors: | X de Montaudouin I Paul-Pont P Gonzalez F Jude M Baudrimont F Le Grand L Bourasseau |
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| Institution: | a University Bordeaux 1, EPOC CNRS UMR 5805, Station Marine d’Arcachon, 2 rue du Pr Jolyet, 33120 Arcachon, France
b University Bretagne Occidentale, IUEM, LEMAR CNRS UMR 6539, Place Copernic, Technopôle Brest Iroise, 29280 Plouzané, France |
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| Abstract: | This study investigated some stress (metals, parasites) and response (immunity, metallothionein) factors in two cockle and two Manila clam populations. Data from eight seasons were averaged to obtain global baseline values. Stress/response characteristics of each population were compared to population health status that was determined through population dynamics parameters. Four different scenarios were discussed: (1) a lightly stressed cockle population with correct population health but with a risk of deterioration (hot spot); (2) a lightly stressed introduced cockle population threatened of extinction. In this case ecological factors were suspected; (3) a moderately stressed clam population with moderate adaptative response. The population was sustainable but the level of stress should not increase (hotspot); and (4) a stressed clam population and unfavourable ecological conditions preventing clam settlement. This monitoring highlighted that the discrepancy between population health and stress levels could be due to insufficient response by bivalves and/or by unfavourable ecological factors. |
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| Keywords: | Bivalves Multistress Metals Parasites Immunity Metallothionein |
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