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Jul

13

2009
 
 

New Diagnosis?



Vitamin deficiency could explain puzzling bird deaths

Vitamin pillsBirds in Europe have been suffering from a mysterious disease that causes paralysis, seizures, and eventually death. Now, a study in the Proceedings of the National Academy of Sciences says the ailment is due to lack of a B vitamin called thiamine.

Researchers have reported occurrences of this paralytic disease in birds near the Baltic Sea since 1982. To find out the cause, a team studied more than 800 specimens from three bird species – the herring gull, common starling, and common eider – in northern Europe. Herring gull eggs had 28 to 41 percent less thiamine than unaffected birds in Iceland, they found, and starlings and eiders also showed signs of thiamine deficiency in the liver and brain. When the researchers treated paralyzed herring gulls with thiamine injections, 15 out of 16 birds recovered.

The disease could help explain why some bird populations in Europe have been declining over the past 30 years, the authors say. But the cause of the deficiency is still unknown and will need to be investigated. – Roberta Kwok

Source: Balk, L. et al. 2009. Wild birds of declining European species are dying from a thiamine deficiency syndrome. Proceedings of the National Academy of Sciences DOI: 10.1073/pnas.090203106

Image © anthonyjhall, iStockPhoto.com

Filed Under Biodiversity, Monitoring | 

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