Avian Conservation and Ecology - Écologie et conservation des oiseaux: Stable Isotope Analysis Reveals that Agricultural Habitat Provides an Important Dietary Component for Non-Breeding Dunlin.

Fig. 3. Cubic regression fit for date versus predicted relative contribution of terrestrial diet for all Dunlin sampled over four winters. The predictive equation is: y = 0.1070 - 0.0012x + 0.0000084x² + 0.000000018x³, r² = 0.091, P = < 0.0001. The Y-axis represents a transformation of δ¹³C data (|δ¹³C|^-1) and is an index of relative use of each ecosystem (estuarine versus terrestrial) in Dunlin diet. [See Erratum]