Lactational Transfer of Polychlorinated-Biphenyls (PCBs) and Other Organochlorines in St. Lawrence Beluga Whales (Delphinapterus leucas)

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• 作者：Marc A. Cadieux ; Derek C. G. Muir…
• 刊名：Archives of Environmental Contamination and Toxicology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：70
• 期：1
• 页码：169-179
• 全文大小：850 KB
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• 作者单位：Marc A. Cadieux (1)
  Derek C. G. Muir (2)
  Pierre Béland (3)
  Brendan E. Hickie (1)
  
  1. Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, ON, K9J 7B8, Canada
  2. Aquatic Ecosystem Protection Research Division, Environment Canada, Burlington, ON, L7R 4A6, Canada
  3. St. Lawrence National Institute of Ecotoxicology, Montréal, QC, H2J 3C3, Canada
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Terrestrial Pollution
  Agriculture
  Ecology
  Forestry
  Environment
  Soil Science and Conservation
  
• 出版者：Springer New York
• ISSN：1432-0703

文摘

This study uses an individual-based contaminant bioaccumulation model for marine mammals to explore factors controlling the transfer of PCBs from mother to calf via nursing in beluga from the St. Lawrence Estuary. Beluga blubber samples (n = 46), along with four matched milk samples from stranded animals over the 1986–1994 period were used for comparison with modelled results. Based on 68 POPs, including 48 PCBs and 20 other organochlorine compounds, milk:blubber ratios were 0.65 between log K _OW 3–6.5, then decreased to 0.1 at log K _OW 8. Model simulations based on this relationship indicated females were transferring PCBs that were relatively very hydrophobic and highly chlorinated less readily than their lower chlorinated counterparts, resulting in an enriched concentration of very hydrophobic congeners in nursing females relative to adult males. There was very good agreement between observed and modelled male:female PCB concentration ratios. Four females within our dataset (15 %) had male-like ΣPCB concentrations as well as male-like congener profiles, suggesting that these individuals may have had a reduced or limited nursing history.