Technical Comments

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

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Science  16 Mar 2007:
Vol. 315, Issue 5818, pp. 1497
DOI: 10.1126/science.1138090

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Rodríguez-Trelles and Rodríguez advocate standardizing old and new collections by climate rather than by calendar and also propose that some of our samples were biased by inappropriate timing. Their first suggestion applies to few species, and its implementation alters photoperiodic cues. Their second point is valid, but our conclusions are robust: Observed genetic changes reflect global warming, not sampling artifacts.

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