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Male and female percent benthic carbon measured using male liver isotopes and female egg isotopes were significantly correlated in nests collected on the southeast shore (rm*e = 0.453 P = 0.039; A). The residuals of the relationships between male and female isotopes with measured habitat variables were also significantly correlated (r = 0.568, P = 0.007) suggesting assortative mating is not simply explained by habitat (B).
