Figure 4
From: Closely related gull species show contrasting foraging strategies in an urban environment
Estimated proportions of urban food (light grey) and marine prey (dark grey) in the diets of great black-backed gulls and herring gulls, respectively. Diet proportions were estimated using Bayesian isotopic mixing model (MixSIAR26) using δ15N and δ13C values of gull whole blood and gull diet-based urban food (bread, fast-food meat) and marine food (bivalves, crabs, fish) sources.
