Divergent ecological adaptation in allopatry leads to behavioral isolation through female resistance.

We initially conducted all analyses both with and without the three morphological covariates, but only present the models including them because results were extremely similar—the only qualitative difference was a slight change from statistical significance ( p = 0.0158) to marginally non-significant ( p = 0.0596) for the interaction term in the model for male lateral displays.

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Low-predation males tended to perform more lateral displays toward foreign females from the same regime, while high-predation males showed a trend in the opposite direction (Fig. 3 a; marginally non-significant interaction term).

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