Technical Comments

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

Science  02 Feb 2007:
Vol. 315, Issue 5812, pp. 598
DOI: 10.1126/science.1136148

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Abstract

Jonzén et al. (Reports, 30 June 2006, p. 1959) proposed that the rapid advance of spring migration dates of long-distance migrants throughout Europe reflects an evolutionary response to climate change. However, most migrants should not advance their migration time because the phenology of their breeding grounds has not changed. It is more likely that migration speed has changed in response to improved environmental circumstances.

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