Stable isotope data from: Use of marine vs. freshwater proteins for egg-laying and incubation by sea ducks breeding in Arctic tundra

<p>This data archive contains data used in analyses of protein sources for egg membranes and whole blood of long-tailed ducks (<em>Clangula hyemalis</em>) and Steller's (<em>Polysticta stelleri</em>), spectacled (<em>Somateria fischeri</em>), and king <em>(Somateria spectabilis)</em> eiders. These data have been published in Miller et al. (2022): Use of marine vs. freshwater proteins for egg-laying and incubation by sea ducks breeding in Arctic tundra (Ecosphere).</p>