Journal of Avian Biology, Vol. 36, No. 3 (May, 2005), pp. 210-221 (12 pages) We studied long-term trends and the yearly variation in mean spring passage time in 36 passerine bird species trapped at ...

The timing of arrival of 81 migratory species in response to the North Atlantic Oscillation (NAO) was studied at two Finnish bird observatories (1970-99). Timing was determined for the first migrants ...