Figure 2

Example of the segmentation process of a First-Passage Time (FPT) profile. FPT profile from a female migratory caribou followed from winter 2004 to winter 2009. FPT is presented against time in days (d). Dashed vertical bars represent breakpoints. a) First run of the segmentation: winter breaks are identified and correspond to the segments with high FPT. The segments between two winter breaks were extracted. Horizontal bars topped by a letter indicate the segments used in b), c) and d) to illustrate the fine scale segmentation. b) Second run of the segmentation on the 2005’s path: solid vertical bars correspond to the beginning and the end of the spring migration. The migration started directly from the winter break and stopped with the beginning of the calving ground use detected in June (grey shade). The corresponding inter-winter path is represented on the map. The black line corresponds to the migration with the departure and arrival dates (black stars), and the dashed line corresponds to the rest of the inter-winter path. c) No calving (2007): a break is present at the beginning of the inter-winter profile, the migration starts at the end of this break. Despite a segment present in June (striped grey shade), no break was detected and the end of the migration was assessed by observing a change in path orientation. d) Uncertain calving ground use (2008): despite a short break was detected in June (grey shade), FPT value remained low. A visual control on the path was performed to confirm that a break occurred within the historical calving ground.