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Science 2 February 2007:
Vol. 315. no. 5812, p. 598
DOI: 10.1126/science.1136920
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Technical Comments

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

Niclas Jonzén,1 Andreas Lindén,2 Torbjørn Ergon,4 Endre Knudsen,4 Jon Olav Vik,4 Diego Rubolini,5 Dario Piacentini,6 Christian Brinch,4 Fernando Spina,6 Lennart Karlsson,7 Martin Stervander,8 Arne Andersson,8 Jonas Waldenström,9 Aleksi Lehikoinen,3 Erik Edvardsen,10 Rune Solvang,10 Nils Chr. Stenseth4*

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.

1 Department of Theoretical Ecology, Ecology Building, Lund University, SE-22362 Lund, Sweden.
2 Department of Biological and Environmental Sciences, Integrative Ecology Unit, Post Office Box 65 (Viikinkaari 1), FIN-00014, Helsinki University, Finland.
3 Department of Biological and Environmental Sciences, Bird Ecology Unit, Post Office Box 65 (Viikinkaari 1), FIN-00014, Helsinki University, Finland.
4 Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, Post Office Box 1066, Blindern, N-0316 Oslo, Norway.
5 Dipartimento di Biologia Animale, Università degli Studi di Pavia, piazza Botta 9, I-27100 Pavia, Italy.
6 Istituto Nazionale per la Fauna Selvatica, via Ca' Fornacetta 9, I-40064 Ozzano Emilia (BO), Italy.
7 Falsterbo Bird Observatory, Fyren, SE-23940 Falsterbo, Sweden.
8 Ottenby Bird Observatory, Post Office Box 1500, SE-38065 Degerhamn, Sweden.
9 Section for Zoonotic Ecology and Epidemiology, Department of Environmental Sciences, Kalmar University, SE-39182 Kalmar, Sweden.
10 Jomfruland Bird Observatory, Post Office Box 1076, N-3704 Skien, Norway.

* To whom correspondence should be addressed. E-mail: n.c.stenseth{at}bio.uio.no.

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