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dc.contributor.advisorJenssen, Bjørn Munronb_NO
dc.contributor.advisorCiesielski, Tomasznb_NO
dc.contributor.authorHelsingen, Even Buvarpnb_NO
dc.date.accessioned2014-12-19T13:12:11Z
dc.date.available2014-12-19T13:12:11Z
dc.date.created2011-11-14nb_NO
dc.date.issued2011nb_NO
dc.identifier456228nb_NO
dc.identifierntnudaim:6775nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/244908
dc.description.abstractConcentrations of Ag, As, B, Ba, Bi, Ca, Cd, Ce, Co, Cs, Cu, Dy, Er, Fe, Ga, Ge, Hg, Ho, K, La, Li, Lu, Mg, Mn, Mo, Na, Nd, Ni, P, Pb, Pr, Rb, S, Sb, Se, Si, Sm, Sn, Sr, Tb, Th, Tl, V, W, Y, Yb and Zn in the livers of grey seals obtained from stranded, hunted and by-caught animals from the Swedish and Polish Baltic coasts were determined by ICP-MS. Stable isotope analysis of δ13C and δ15N was applied to link chemical element concentrations to feeding preferences (pelagic vs. benthic) and trophic position of the seals, respectively. Isotopic ratios in the seals increased in seals from the north towards the southern Baltic Sea, with markedly higher isotopic signatures in seals inhabiting the Polish coast . Analysis of covariance revealed differences in chemical element concentrations between areas for As, B, Cu, Ni, Rb, Sr, Tl with most of these elements exhibiting higher concentrations in seals from the southern Baltic Sea. Additionally age related differences in concentrations of several trace elements were found. Silver, B, Bi, Cd, Co, Hg, Mo, Sb, Se, Sn, V and Zn and the rare earth elements (REE) were found to increase with age. The role of Se in detoxification of Hg was confirmed by high correlation between these two elements (r = 0.99, p < 0.0001). Significantly higher Se:Hg molar ratio were observed in yearlings compared to juvenile and adult seals . Several other elements also revealed statistically significant interrelationships, especially pronounced for the REEs.nb_NO
dc.languagenornb_NO
dc.publisherInstitutt for biologinb_NO
dc.subjectntnudaim:6775no_NO
dc.subjectMSENVITOX Environmental Toxicology and Chemistryno_NO
dc.subjectEnvironmental Toxicologyno_NO
dc.titleBioaccumulation of chemical elements in grey seals (Halichoerus grypus) from the Baltic Seanb_NO
dc.title.alternativeBioaccumulation of chemical elements in grey seals (<i/>Halichoerus grypus<i>) from the Baltic Seanb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber73nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for biologinb_NO


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