Table 1.

Summary of the data available and used for modelling. (Here, we list the number of individuals for each capture site and treatment. The number of individuals is given as the number for which data were available, and the number originally tagged in parentheses. The locations available for modelling are the subset of the total location dataset that could be annotated with all environmental layers.)

group	treatment	release date	sample size	no. of locations for modelling
Finland	control	24 May–2 June	34 (36)	6'825
Solovki Island	control	18–19 August	20 (20)	(both groups combined)
Helgoland	translocated	16 August	12 (12)	888
Kazan	translocated	19 August	10 (10)	675