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Bibliographie de l'Institut Maurice-Lamontagne

Mollusques - Céphalopodes / Sepia officinalis / Seiche commune

LACOUE-LABARTHE, T., R. VILLANUEVA, C. ROULEAU, F. OBERHÄNSLI, J.-L. TEYSSIÉ, R. JEFFREE, P. BUSTAMANTE, 2011. Radioisotopes demonstrate the contrasting bioaccumulation capacities of heavey metals in embryonic stages of cephalopod species. PLoS ONE, 6(11): 1-5 art no e27653.

[Résumé disponible seulement en anglais]
Cephalopods play a key role in many marine trophic food webs and also constitute alternative fishery resources in the context of the ongoing decline in finfish stocks. Most coastal cephalopod species of commercial importance migrate into shallow waters during the breeding season to lay their eggs, and are consequently subjected to coastal contamination. Eggs of common cuttlefish Sepia officinalis, European squid Loligo vulgaris, common octopus Octopus vulgaris and the sepiolid Rossia macrosoma were exposed during embryonic development to dissolved 110mAg, 109Cd, 60Co, 54Mn and 65Zn in order to determine their metal accumulation efficiencies and distribution among different egg compartments. Cuttlefish eggs, in which hard shells enclose the embryos, showed the lowest concentration factor (CF) values despite a longer duration of exposure. In contrast, octopus eggs, which are only protected by the chorionic membrane, accumulated the most metal. Uptake appears to be linked to the selective retention properties of the egg envelopes with respect to each element. The study also demonstrated that the octopus embryo accumulated 110mAg directly from the dissolved phase and also indirectly through assimilation of the contaminated yolk. These results raise questions regarding the potential contrasting vulnerability of early life stages of cephalopods to the metallic contamination of coastal waters.©2011 PLoS ONE

LACOUE-LABARTHE, T., M. WARNAU, M. METIAN, F. OBERHÄNSLI, C. ROULEAU, P. BUSTAMANTE, 2009. Biokinetics of Hg and Pb accumulation in the encapsulated egg of the Common Cuttlefish Sepia officinalis : radiotracer experiments. Sci. Total Environ., 407(24): 6188-6195 .

[Résumé disponible seulement en anglais]
Uptake and depuration kinetics of dissolved 203Hg and 210Pb were determined during the entire embryonic development of the eggs of the cuttlefish, Sepia officinalis (50d at 17 °C). 203Hg and 210Pb were accumulated continuously by the eggs all along the development time reaching load/concentration ratio (LCR) of 467 ± 43 and 1301 ± 126 g, respectively. During the first month, most of the 203Hg and 210Pb remained associated with the eggshell indicating that the latter acted as an efficient shield against metal penetration. From this time onwards, 203Hg accumulated in the embryo, indicating that it passed through the eggshell, whereas 210Pb did not cross the chorion during the whole exposure time. It also demonstrated that translocation of Hg associated with the inner layers of the eggshell is a significant source of exposure for the embryo. This study highlighted that the maturing embryo could be subjected to the toxic effects of Hg in the coastal waters where the embryonic development is taking place.©2009 Elsevier B.V.