Carbon and nitrogen stable isotopic ratios of Dunlin (Calidris alpina)

Carbon and nitrogen stable isotopic signatures of dunlin (Calidris alpina) toenails, red blood cells (RBC) and plasma collected at the Tagus estuary (Portugal) and Banc d'Arguin (Mauritania) during the winters of 2012-2013 and 2013-2014, and at the Tagus estuary (Portugal) during spring migration of 2013 and 2014. Wintering origins of dunlins sampled during spring migration at the Tagus estuary, as determined by a discriminant analysis based on isotopic signatures of toenails (see Catry et al. 2016, 10.1016/j.baae.2015.10.005), are also included. Birds identified as originating from wintering areas outside Mauritania and Portugal (e.g. Morocco) are included in the dataset but were excluded from further analyses, as well as two birds with low classification scores