Evidence of migratory coupling between grey wolves and migratory caribou

We collected data on grey wolf movements in northern Québec in the annual range of the Rivière-aux-Feuilles migratory caribou herd (RFH). In February and March of 2011–2019, we captured 59 adult grey wolves within the RFH range from a helicopter and using either a net gun or a tranquilizer dart gun with Telazol (10 mg.kg-1). We equipped grey wolves with GPS collars (Lotek, Vectronic, Telonics) programmed to record a location every 1 to 5 hours depending on the collar model and year. Individual grey wolves monitoring lasted on average 419 + 227 days (mean + SD). We defined each wolf-year as 1 April to 31 March of the following year. We captured caribou in the RFH range between December and March each year as part of the long-term population monitoring conducted by the Ministère de l’Environnement, de la Lutte aux changements climatiques, de la Faune et des Parcs (MELCCFP) and Caribou Ungava. We captured caribou from a helicopter with a net gun and equipped them with GPS collars (Vectronic). GPS collars were set to record a location every 1 to 13 hours. A total of 431 females from the RFH were monitored for 741.5 days on average. Please, refer to Material and Methods for more details about the data cleaning and processing.