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. 5. Relative use of fields (as represented by transformed δ¹³C values) and mean minimum temperature for previous 21-d period, separated by age class, adults represented by black filled circles, juveniles by open circles. 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. The linear regression line of significantly increasing field use with declining temperature is shown in black for adults. The trend line shown for juveniles (dotted line) is for comparison only and is not significant. [See Erratum]