Increase in Developmental Instability in a Field-Collected Chironomus Population Maintained Under Laboratory Conditions - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg Accéder directement au contenu
Article Dans Une Revue Bulletin of Environmental Contamination and Toxicology Année : 2015

Increase in Developmental Instability in a Field-Collected Chironomus Population Maintained Under Laboratory Conditions

Résumé

In order to be a relevant indicator of exposure towards teratogenic stressors, morphological defects should not be passed on to the next generation. In this study, we compare morphological variations in Chironomids collected from a contaminated river stretch with those of their progeny, reared in uncontaminated sediment under laboratory conditions. We focused on mentum defects (deformities, fluctuating asymmetry and mean shape change), measured by geometric morphometrics. We observed no significant variation in deformity rate between the parental generation and its progeny. On the contrary, we observed a significant increase in fluctuating asymmetry and a significant decrease in mentum centroid size in the offspring. Our results suggest that shape defects are not caused by direct exposure to teratogenic stressors alone. We propose four hypotheses to explain this: (a) teratogenic contaminants are present in egg-clutches, (b) contaminants at the sampling site have mutagenic effects, (c) costs of tolerance, and (d) contamination-induced genetic impoverishment.
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Dates et versions

hal-01410111 , version 1 (06-12-2016)

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Hélène Arambourou, Philippe Branchu, Jean-Nicolas Beisel. Increase in Developmental Instability in a Field-Collected Chironomus Population Maintained Under Laboratory Conditions. Bulletin of Environmental Contamination and Toxicology, 2015, 94 (6), pp.681-687. ⟨10.1007/s00128-015-1497-5⟩. ⟨hal-01410111⟩
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