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Scientific Correspondence
Nature 399, 213 (20 May 1999) | doi:10.1038/20335
Birds extend their ranges northwards
Chris D. Thomas1 & Jack J. Lennon1
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Abstract
We have analysed the breeding distributions of British birds over a 20-year period. After controlling for overall population expansions and retractions, we find that the northern margins of many species have moved further north by an average of 18.9 km during this time. This general northward shift took place during a period of climatic warming, which we propose might be causally involved.
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