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. 6. Relative use of fields (as represented by transformed δ¹³C values) and mean total precipitation 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. ASY refers to after-second-year birds, and SY to second-year birds. The linear regression line of significantly increasing field use with increasing precipitation is shown in black for adults. The dotted line shown for juveniles is for comparison only and is not significant. [See Erratum]