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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