Fig. 1From: Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North SeaBiplots of δ13C and δ15N isotope values of puffin (a) and razorbill (b) feathers grown in the winters of 2007/2008 (poor survival year; circles) and 2014/2015 (high survival year; triangles)Back to article page