Mate choice decision rules: Trait synergisms and preference shifts.

In the model that included the cheek score, beak score, and the product of these trait values, the beak × cheek product score was the only variable that approached significance (model 16); a likelihood ratio (LR) test indicated that model 16 is better than model 15 (LR χ 2 (1) = 3.93, p = .047).

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Both the additive and product score models (models 5 and 6 in Table 2 ) were highly significant and remained so after correction for multiple comparisons: males that had both large cheeks and high beak scores were more likely to display success in pairing trials.

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