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Table 3 Population median and standard deviation δ13C and δ15N feather values of puffins and razorbills and the population calibration-offset values and standard deviations calculated from the difference between median isoscape extracted isotope values within the population kernel density areas for each feather type and median measured feather isotope values of razorbills and puffins in winters 2007/8 and 2014/15

From: Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North Sea

Feather Type Puffin 2007/08 Puffin 2014/15 Razorbill 2007/08 Razorbill 2014/15
Body Cheek Body Cheek Body Body Cheek
δ13C: Median & (σ) −15.87 (0.38) −15.65 (0.33) −16.81 (0.72) −16.46 (0.27) − 16.47 (0.71) −16.48 (0.68) − 16.77 (0.31)
δ15N: Median & (σ) 12.58 (2.94) 14.52 (1.95) 15.15 (0.58) 16.43 (0.09) 16.44 (1.40) 17.79 (0.46) 15.76 (0.65)
Δ13Cf-j: Cal. offset & (σ) −0.02 (0.71) 0.57 (0.95) −0.60 (1.03) −0.21 (0.99) 0.65 (1.45) 1.11 (0.86) −0.07 (1.13)
Δ15Nf-j: Cal. offset & (σ) 1.74 (2.99) 4.29 (2.19) 4.63 (0.92) 6.02 (0.99) 6.13 (2.00) 6.30 (1.73) 4.78 (1.22)