Fig. 4

Example of temperature gradients of A. digitata, left, and A. gregorii, right. Curves are smoothed, average temperature per 1 min. Left: Temperature gradient of 6 tc’s. Each 2 black dotted, light grey and dark grey lines are temperatures outside downwards, inside the shell downwards and in the centre. Heat exposure 06:25. Record time 37 min. Right: temperature gradient of 4 tc’s. Black dotted, light grey and dark grey lines are temperatures outside downwards, inside the shell downwards and in the centre. Grey dotted line is outside sidewards. Heat exposure 6 min. Record time 17 min