Average diet-tissue discrimination factors (mean <i>Δ</i> ± SD of cormorant tissue + catfish diet) for carbon, nitrogen, and sulfur stable isotopes (<i>Δ</i>¹³C, <i>Δ</i>¹⁵N, and <i>Δ</i>³⁴S) in wild Double-crested Cormorants (<i>Phalacrocorax auritus</i>) fed a diet of farm-raised catfish in captivity.

Tissue types that differed significantly from one another (p < 0.05) are indicated by different capital letters after parentheses within each column (ANOVA with post-hoc Tukey Kramer HSD).