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Table 2 Assignment conditions adopted for stable isotope-based location of puffins and razorbills against isoscapes derived from jellyfish tissue [58]

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

Variable Isoscape Jellyfish Seabird Assignment
Puffin Razorbill
2007/08 2014/15 2007/08 2014/15
Measurement error (σ) δ13C & δ15N: 0.2 δ13C & δ15N: 0.2
Between-individual variance (measured) δ13C: 0.78, δ15N: 1.02 δ13C: 0.60,
δ15N: 2.74
δ13C: 0.52, δ15N: 0.91 δ13C: 0.63,
δ15N: 2.10
δ13C: 0.51, δ15N: 0.58
Calibration-Offset and variance values NA Derived – see Results Table 3 below.
Threshold odds ratio NA 1.42