Baltic seal

Wiberg, K. Bergman, A. Olsson, M. Roos, A. Blomkvist, G. Haglund, R, Concentrations and enantiomer fractions of organochlorine compounds in Baltic seals hit hy reproductive impairment Environ. Toxicol. Chem. 2002, 21, 2452-2551. 

PCDE profiles in juvenile and adult Baltic seals have been different and higher chlorinated PCDEs have dominated in old seals [113]. There have also been differences between gray seals and ringed seals most likely being due to differences in metabolism and/or diet. Because the isomer patterns were similar between juvenile gray seals and salmon, fish has been suggested as one of the most likely sources of PCDEs in seals [113]. 

Jensen S, Jansson B, Olsson M. 1979. Number and identity of anthropogenic substances known to be present in Baltic seals and their possible effects on reproduction. Ann NY Acad Sci 320 436-448. 

As a photochemical oxidation product of DMS (Bentley et al., 1971) dimethyl sulphoxide may be detected in seawater which has been reported to inhibit photosynthesis in algae (Cheng et al., 1972). Methionine and biotin sulphoxides are oxidation products of methionine and biotin respectively, while microorganisms have been reported which reduce these compounds as well as DMDS (Zinder and Brock, 1978b). These authors also comment on the chemical stability of the sulphones. The methyl sulphones which have been identified in Baltic seal by Jensen and Jansson (1976) are, however, metabolically produced from PCB and DDE within the animal. 

Thinning of eggshells in certain species of birds, the decrease in Baltic Seal population, and adverse impacts on fish populations as a result of exposure to EDCs have been reported. 

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