Outline Research activities on polar bears and their ecosystem


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Outline

  • Research activities on polar bears and their ecosystem

  • Background: ecology

  • Geographic variation

  • Hints on possible effects…

  • Trends in persistent organic pollutants





Ocean currents in the Arctic



Air currents







Study area





FOOD WEB - INTERACTIONS



MARGINAL ICE ZONE FOOD WEB



Diet composition

  • Understanding diet is a key component for understanding movement of pollutants through an ecosystem

  • 2 “new” methods being used

    • Carbon and nitrogen isotopes
      • see papers by K.A. Hobson
    • Fatty acid composition
      • see Iverson et al. 2004 Ecological Monographs




Home ranges of 3 female polar bears





Effects of Pollution



Polychlorinated biphenyls











Immune system - PCB relationships



Field experiment





Effects of age



PCB in plasma associated with nutritional index



Transfer of pollution to young



Concentration of POPs in polar bear milk





Monitoring

    • repeated assessment of status of some quantity to detect change over time


Organochlorine changes between 1967 and 1994 for adult males and females sampled at Svalbard



Trend of PCB-153 in blood for polar bears in the Norwegian Arctic



Pollution in polar bears may impact:




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