Fig. 2. Isotopic values (mean ± SD δ15N and δ13C) for Dunlin whole blood (all years combined, n = 268), estuarine invertebrates (n = 21 samples), and terrestrial invertebrates (n = 16 samples). End points illustrated here are raw values and are not corrected by known fractionation factors. Samples of scoter (n = 5) and American robin (n = 5) are muscle tissue.