Fig. 1.

a Sampling and temperature logger locations. b Daily average seawater temperature (n = 240 readings per day) from January 2001 to December 2015. Temperatures recorded by a logger submerged to 10 m depth at Saulmore Point (mouth of Loch Etive, opposite Dunstaffnage Bay [056° 27′ N, 005° 24′ W], a). Data provided by Martin Sayer from the UK National Facility for Scientific Diving. Dashed line and grey region represents experimental holding temperatures (16 ± 1 °C)