Technical Comments

Response to Comment on "Rapid Advance of Spring Arrival Dates in Long-Distance Migratory Birds"

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Science  02 Feb 2007:
Vol. 315, Issue 5812, pp. 598
DOI: 10.1126/science.1136920

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Both's comment questions our suggestion that the advanced spring arrival time of long-distance migratory birds in Scandinavia and the Mediterranean may reflect a climate-driven evolutionary change. We present additional arguments to support our hypothesis but underscore the importance of additional studies involving direct tests of evolutionary change.

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