1. Advanced Facility for Avian Research, University of Western Ontario 1 Department of Biology , , London, ON , Canada , N6A 5B7
2. University of Rhode Island 2 Department of Natural Resources Science , , Kingston, RI 02881 , USA
3. Institute of Environmental Sciences 3 , Faculty of Biology , , 30-387 Krakow , Poland
4. Jagiellonian University 3 , Faculty of Biology , , 30-387 Krakow , Poland
5. Nencki Institute of Experimental Biology, Polish Academy of Sciences 4 , 02-093 Warsaw , Poland