Fig. 1

Profiles of measurement parameters in a free-swimming Risso’s dolphin over 11 days. The temperature of the muscle–blubber interface (Tmbi) and external acceleration averaged over 60 s (EA60) were recorded every 15 min. Heart rate (HR) was recorded every 30 min, and the water temperature (Tw) was recorded every 5 min. The black short lines on the bottom indicate feeding time. The bars on the bottom indicate the time of heavy rain (light gray), the bay swimming time (dark gray), and the night phase (black)