1. The Helsinki Lab of Ornithology (HelLO), Finnish Museum of Natural History, Univ. of Helsinki; Helsinki FI-00014 Finland
2. Centre for Ecological and Evolutionary Synthesis (CEES), Dept of Biosciences; Univ. of Oslo; Norway
3. Aronia Coastal Zone Research Team; Åbo Akademi Univ. and Novia Univ. of Applied Sciences; Ekenäs Finland