- Published:
Heavy Metals in Tissues of the Mute Swan (Cygnus Olor)
Tungmetaller i vävnader från knölsvan (Cygnus olor)
Acta Veterinaria Scandinavica volume 20, pages 447–465 (1979)
Abstract
During the period 1973–1977, a number of mute swans (Cygnus olor) were submitted to the National Veterinary Institute in Stockholm and examined post mortem. Organ tissues from 58 swans were chemically analysed for concentrations of lead, cadmium, copper, zinc, iron and manganese. In 10 swans (17 %), elevated residues of lead were found indicating intoxication. Cadmium concentrations were significantly higher in adult than in juvenile swans; also in swans from the Swedish east coast compared with specimens from the west coast. Remarkably high copper concentrations were often found, with one exception yet without any signs of intoxication. High zinc and cadmium concentrations were often found in the same swans. The findings of iron and manganese were not remarkable.
Sammanfattning
Under tidsperioden 1973–1977 insändes ett antal döda knöl-svanar (Cygnus olor) till Statens veterinärmedicinska anstalt i Stockholm för undersökning. Organ från 58 av dessa svanar analyserades kemiskt på halter av bly, kadmium, koppar, zink, järn och mangan. Hos tio svanar (17 procent) påvisades stärkt förhöjda blyhalter, tydande på förgiftning. Kadmiumhalterna var signifikant högre hos vuxna än hos unga svanar och också hos svanar från den svenska ostkusten jämfört med svanar från västkusten. Anmärkningsvärt höga kopparhalter påträffades ofta, dock med ett undantag utan tecken på förgiftning. Höga zink- och kadmiumhalter påvisades ofta hos samma fåglar. Inga speciella kommentarer kan göras beträffande fynden av järn och mangan.
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