- Data from: The dual role of rivers in facilitating or hindering movements of the false heath fritillary butterfly(2016-01-27) Cabeza, Mar; Fabritius, Henna; Lehtomäki, Joona; Ovaskainen, Otso; Rönkä, Katja; Wahlberg, Niklas; University of Helsinki - Fabritius, Henna; University of Helsinki - Ovaskainen, Otso; University of Helsinki - Rönkä, Katja