changes in total mercury, methylmercury, and selenium blood levels during different life history stages of the baltic grey seal (halichoerus grypus grypus).using the blood of grey seal pups, the blood and milk of female grey seals inhabiting the hel marine station of gdansk university's institute of oceanography (hms), we monitored the transfer of total mercury (thg), methylmercury (mehg), and selenium (se) with blood during foetal life and nursing. changes in the concentration of mercury and selenium were characterised in the pups' blood during their first three months of life when they transition from suckling, to a post-weaning fast, to eating f ...201931048158
fur and faeces - routes of mercury elimination in the baltic grey seal (halichoerus grypus grypus).this study focused on evaluating the elimination of hg by baltic grey seals (halichoerus grypus grypus) via faeces and pelage. in addition, we investigated the potential for ecosystem contamination via these routes. faeces and fur were collected in 2014-2017 from captive adult grey seals and their pups. the concentrations of total mercury (thg) and methylmercury (mehg) were measured in the samples. the amount of mercury eliminated in a labile form (the sum of the bioavailable hg(ii) and methylme ...202032062253
could biotransport be an important pathway in the transfer of phenol derivatives into the coastal zone and aquatic system of the southern baltic?bird guano and the faeces of marine mammals appear to be a significant yet undisclosed biotransporter of endocrine disrupting compounds in the marine environment. the authors determined the concentration of bisphenol a (bpa), 4-tert-octylphenol (4-t-op) and 4-nonylphenol (4-np) removed from birds and seals in their droppings into the coastal zone of the gulf of gdansk (southern baltic sea).the research was carried out on samples of bird guano collected during the breeding season and after in 201 ...202032443210
transfer of mercury and phenol derivatives across the placenta of baltic grey seals (halichoerus grypus grypus).the placenta is an intermediary organ between the female and the developing foetus. some chemical substances, including the most harmful ones, exhibit the ability to accumulate in or penetrate through the placenta. the aim of the study was to determine the role of the placenta of the baltic grey seal (halichoerus grypus grypus) in the transfer of endocrine disrupting compounds (edcs) - (bisphenol a, 4-tert- octylphenol, 4- nonylphenol), as well as total and organic mercury. 30 placentas were col ...201728898953
dental pulp exposure, periapical inflammation and suppurative osteomyelitis of the jaws in juvenile baltic grey seals (halichoerus grypus grypus) from the late 19th century.the systematic analysis of museum collections can provide important insights into the dental and skeletal pathology of wild mammals. here we present a previously unreported type of dental defect and related skull pathology in five juvenile baltic grey seals that had been collected in the course of a seal culling program along the danish coast in 1889 and 1890. all five skulls exhibited openings into the pulp cavities at the crown tips of all (four animals) or two (one animal) canines as well as ...201930978237
analytical methods for determination of bisphenol a, 4-tert-octylphenol and 4-nonylphenol in herrings and physiological fluids of the grey seal.•the aim of this work was to develop the methods of determination for phenol derivatives: bisphenol a (bpa), 4-tert-octylphenol (op) and 4-nonylphenol (np), in the whole body of herring clupea harengus and in physiological fluids of the baltic grey seal halichoerus grypus grypus (blood and milk).•methods were based on liquid chromatography coupled with a fluorescence detector (hplc-fl).•these methods were satisfactorily validated, each showing good recovery (>80%) and precision (rsd < 15%). rega ...201830294560
maternal transfer of phenol derivatives in the baltic grey seal halichoerus grypus grypus.studies of circulating levels in difference sex and age classes, and maternal transfer of bisphenol a, 4-tert-octylphenol and 4- nonylphenol in the baltic grey seal were performed from 2014-2017. blood was collected from long-term captive adult males, pregnant females and pups. milk was collected from nursing females. the aim of this study was not only to determine the concentrations of phenol derivatives, i.e. bisphenol a (bpa), 4-tert-octylphenol (op) and 4-nonylphenol (np), but also to try to ...201830072224
Displaying items 1 - 7 of 7