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Relationships between vitamin A and PCBs in grey seal mothers and pups during lactation |
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| Authors: | Marie Vanden Berghe Stéphanie Polain Jean-Pierre Thomé |
| Institution: | a Institut des Sciences de la Vie, Unité de biochimie de la nutrition, Université catholique de Louvain, Croix du Sud 2/8, 1348 Louvain-la-Neuve, Belgium b Sea Mammal Research Unit, University of St Andrews, St Andrews, Fife KY16 9AJ, Scotland, United Kingdom c Laboratoire d'écologie animale et d'écotoxicologie, Université de Liège, Allée du 6 Août, 15, 4000 Sart-Tilman, Liège, Belgium d Unité d'économie rurale, Université catholique de Louvain, Croix du Sud 2/15, 1348 Louvain-la-Neuve, Belgium |
| Abstract: | A previous study has shown a simultaneous increase of vitamin A and PCBs in grey seal (Halichoerus grypus) milk at late lactation (Debier et al., 2004). Here we sought to understand this unexpected relationship by comparing the dynamics of vitamin A and PCBs in the different tissue compartments of transfer. Lactating grey seals and their pups were sampled longitudinally in Scotland during the 2006 breeding season. As blubber reserves decreased, concentrations of vitamin A and PCBs increased during lactation in the inner layer of maternal blubber. A concomitant rise was observed in milk and consequently in the serum of suckling pups. The similar dynamics of vitamin A and PCBs in milk and inner blubber suggest a common mechanism of mobilisation from maternal body stores and transfer into the milk. A panel data analysis highlighted a negative impact of PCBs in milk and pup serum on vitamin A status in pup serum. |
| Keywords: | Grey seal Lactation Vitamin A PCBs Blubber |
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