Fig. 1

Annual horizontal migration and depth–temperature envelope for shark 1 (red) and shark 2 (blue) over 365-day deployments. a Most probable tracks with daily positions, tagging locations (downward triangles) and pop-up locations (upward triangles). b Depth–temperature envelopes based on hourly median depth and temperature data for each shark (n = 2 × 8760 h). Isopleths encompass 50% (solid lines) and 95% (dashed lines) of the data. Marginal densities for depth and temperature are displayed along the respective axes. For visualization purposes, the plot was restricted to 0 °C and 1000 m depth, excluding 13 datapoints