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flocks used to be common near London, but the number of finches has been declining for decades. Since 1995, the number of london has fallen by 71%. Now, researchers believe they have found the cause: a mosquito-borne disease called avian malaria.
scientists collected data from 11 sparrow habitats around London for three years. They count the original bird population each year and collect blood and faeces from individuals.
results show that seven of the 11 populations of birds are disappearing, with about 74 per cent of sparrows carrying malaria. This is the highest parasitic infection rate found in wild birds in northern Europe, researchers report in the Journal of the Royal Society Open Science. Bird malaria may also have led to declines in bird populations in Western Europe, North America and India, the team said.
similar to other forms of malaria, which is transmitted when mosquitoes bite birds and feed on their blood. The disease can cause deadly infections in birds and can be passed on to future generations.
team found that most sparrows carry the parasite, but in a declining population, the number of parasites found in each sparrow has increased significantly, especially in young birds.
do not know why malaria is particularly prevalent in birds, but they say further research could provide clues. (
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relevant paper information: