Journal
SCIENCE
Volume 308, Issue 5722, Pages 691-693Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1109523
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Geographical clines in genetic polymorphisms are widely used as evidence of climatic selection and are expected to shift with climate change. We show that the classic latitudinal cline in the alcohol dehydrogenase polymorphism of Drosophila melanogaster has shifted over 20 years in eastern coastal Austratia. Southern high-latitude populations now have the genetic constitution of more northerly populations, equivalent to a shift of 40 in latitude. A similar shift was detected for a genetically independent inversion polymorphism, whereas two other linked polymorphisms exhibiting weaker clinal patterns have remained relatively stable. These genetic changes are likely to reflect increasingly warmer and drier conditions and may serve as sensitive biomarkers for climate change.
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