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Science 16 March 2007:
Vol. 315. no. 5818, p. 1497
DOI: 10.1126/science.1136298
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Technical Comments

Comment on "Global Genetic Change Tracks Global Climate Warming in Drosophila subobscura"

Francisco Rodríguez-Trelles1* and Miguel Ángel Rodríguez2

Balanyà et al. (Reports, 22 September 2006, p. 1773) build on earlier claims that chromosomal inversion polymorphisms of Drosophila subobscura are rapidly evolving in response to global warming. However, that conclusion is not adequately buttressed by their data, because they overlooked the lag between calendar and climatological dates created by the progressive lengthening of the growing season in their sampling approach.

1 Grupo de Medicina Xenómica, Hospital Clínico Universitario, Universidade de Santiago de Compostela, 15706 Santiago, Spain.
2 Department of Ecology, University of Alcalá, 28871 Alcalá de Henares, Madrid, Spain.

* To whom correspondence should be addressed. E-mail: ftrelles{at}usc.es

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Science. ISSN 0036-8075 (print), 1095-9203 (online)