Influence of anthropogenic stress on fitness and behaviour of a key-species of estuarine ecosystems, the ragworm Nereis diversicolor |
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Authors: | C Mouneyrac H Perrein-Ettajani C Amiard-Triquet |
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Institution: | a MMS, EA2160, Faculté de pharmacie, 1 rue G. Veil, BP 53508, 44035 Nantes Cedex 1, France b Institut de Biologie et Ecologie Appliquée, CEREA, Université Catholique de l'Ouest, 3 Place André Leroy, Angers, 44 rue Rabelais, 49008 Angers Cedex 01, France c CNRS, Université de Nantes, MMS, EA2160, Faculté de pharmacie, 1 rue G. Veil, BP 53508, 44035 Nantes Cedex 1, France |
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Abstract: | Fitness, (biometric measurements, reproduction) and behaviour that are ecologically relevant biomarkers in assessing the quality of estuarine sediments were studied by comparing the responses of the polychaete worm Nereis diversicolor - a key species in estuaries - along a pollution gradient. Intersite differences were shown for all the measured parameters: size-weight relationships, energy reserves as glycogen and lipids, sexual maturation patterns, total number of oocytes per female, total and relative fecundity, burrowing behaviour. The physiological and behavioural status of N. diversicolor was consistently disturbed in the larger, most contaminated estuaries (Loire and Seine, Fr.) compared to reference sites (Bay of Bourgneuf, Goyen estuary, Fr.). Many classes of potentially toxic chemicals present in these estuaries most likely contribute to these impairments but food availability may act as a confounding factor, interfering with the potential impact of contaminants. |
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Keywords: | Nereis diversicolor Fitness Reproduction Behaviour Ecologically relevant biomarkers |
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