Concentrations and Interactions of Selected Elements in Tissues of Four Marine Mammal Species Harvested by Inuit Hunters in Arctic Alaska, With an Intensive Histologic Assessment, Emphasizing the Beluga Whale
Woshner, Victoria M.
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https://hdl.handle.net/2142/87145
Description
Title
Concentrations and Interactions of Selected Elements in Tissues of Four Marine Mammal Species Harvested by Inuit Hunters in Arctic Alaska, With an Intensive Histologic Assessment, Emphasizing the Beluga Whale
Author(s)
Woshner, Victoria M.
Issue Date
2000
Doctoral Committee Chair(s)
Val R. Beasley
Department of Study
Veterinary Clinical Medicine
Discipline
Veterinary Clinical Medicine
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Environmental Sciences
Language
eng
Abstract
Inorganic Hg was localized through autometallography in beluga hepatic and renal light microscopic sections. Metal grains occurred at high densities in kidney cortical tubular epithelium, with lower densities in medullary tubular epithelium. In liver, metal grain deposition showed marked zonation, accumulating in periportal regions of whales with lower tissue Hg. In belugas with higher hepatic Hg, metal grains were most abundant periportally, but also found pericentrally and midzonally. Metal grains concentrated in stellate macrophages, with much lower numbers in hepatocytic cytoplasm. Staining intensities correlated with tissue concentrations of inorganic, organic, and total Hg. Although hepatic lipofuscin and metal grains were sometimes co-localized, they more often were not. Because marked lipofuscin deposition occurs independent of Hg, causality between hepatic Hg concentration, lipofuscin deposition, and hepatic lesions cannot be inferred.
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