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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

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.


Figure 1 Fig. 1. Schematic depiction of the hypothetical influence of a lengthened growing season on the seasonal cycle (pi) of a typically southern inversion in the Northern Hemisphere (9). Inversion frequencies begin to rise earlier in spring and to decline later from midsummer in the present (outer cycle) than historically (inner cycle). Sampling the same calendar date (red dot) as in the past (black dot) gives frequencies that are systematically upwardly shifted ({Delta} pi) with respect to the old ones, despite no change in the long-term level of the inversion. [View Larger Version of this Image (16K GIF file)]
 

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