Persistent organic pollutants in liver. ΣDDT – sum of 5 individual dichloro-diphenyl-trichloroethanes

Pollution: Contaminants in seabirds
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DDT was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and other insect-borne human diseases among military and civilian populations.

It was also used for insect control in crop and livestock production, institutions, homes, and gardens. Today, DDT is classified as a probable human carcinogen. There have been restrictions on the use of DDT since 1972. However, DDT has a limited use in mosquitoes control and prevention of malaria.

The two predatory bird species; great black-backed gull and glaucous gull had significantly higher liver concentrations of DDT than the other seabird species. The variation and uneven distribution of the data make it difficult to analyze regional and temporal differences and no such differences were found. 

Levels of ΣDDT in seabird liver 

  Species Species Species
  Levels in Black guillemot Levels in Brünnichs guillemot Levels in Common eider
  Levels in Common guillemot Levels in Northern fulmar Levels in Great black-backed gull
  Levels in Glaucous gull Levels in Herring gull Levels in King eider
  Levels in Black-legged kittiwake  Levels in Little auk  Levels in Levels of liver-SDDT in Long-tailed duck.
  Levels in Atlantic puffin