Predicted diet composition of penguin chicks at Cape Shirreff, Livingston Island derived from stable isotope analysis using two variants of the SIAR two-source Bayesian mixing model.

Diet compositions were estimated using SIAR [21] and are presented as mean estimates with 95% credibility intervals (in parentheses). Model 1 uses the δ15N and δ13C values of a representative fish species, Pleuragramma antarcticum, as the ‘fish’ source while Model 2 use yearly and species-specific weighted ‘fish’ δ15N and δ13C values (Table S1 and S2).