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Table 4 Average puffin and razorbill feather carbon and nitrogen isotope values across all feather type samples collected in winter 2007/8, average pipefish isotope values extracted from pipefish carbon and nitrogen isoscapes, produced from samples collected in winter 2007/8, within the highest likely foraging regions during moult of both puffins and razorbills, and the difference between these values

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

 

Puffin

Razorbill

Carbon

Nitrogen

Carbon

Nitrogen

Average feather isotope values (‰)

−15.76

13.55

−16.47

16.77

Average pipefish isotope values in most likely foraging locations during feather moult (‰)

−18.22

9.88

−18.12

9.96

Difference between pipefish isotope values and seabird isotope values (‰)

2.46

3.67

1.65

6.81