Table 1.

Sea surface temperature gradients (gSST, means ±s.e.) for all locations of the 43 king penguin trips.

trip phases	gSST (%)	U-test (versus slowing-down episodes)
transit	2.13±1.28	p<0.001
central
slowing-down episodes	2.95±1.80
speed-up episodes	2.65±1.61	p=0.023
return	2.19±1.36	p<0.001