Schematic representation of our mate choice experiment.

<p>All females participated in one SC trial and one DC trial, each of which included two males, one from SAA and one from CPN. In all cases, DC trials included a pure blue male from CPN and a pure white male from SAA. In trial pairings with an identical morph SC trial, the males included in the SC trial were either both pure yellow or both yellow-orange. In trial pairings with a dosage effect SC trial, the possible male pairings in the SC trial were blue-orange (CPN) vs. white-orange (SAA) or blue-yellow (CPN) vs. white-yellow (SAA).</p>