Modality interactions alter the shape of acoustic mate preference functions in gray treefrogs

Area of Science:

• Animal Behavior
• Evolutionary Biology
• Sensory Ecology

Background:

• Sexual selection occurs in complex environments with multi-modal sensory inputs.
• Female mate choice can be influenced by interactions between different sensory modalities.

Purpose of the Study:

• To investigate how visual stimuli affect female gray treefrogs' (Hyla versicolor) responses to male acoustic advertisement calls.
• To determine if multimodal sensory integration alters female preference functions and thus sexual selection pressures on male signals.

Main Methods:

• Measured female preference functions for acoustic call traits under unimodal (acoustic only) and multimodal (acoustic + visual animation) conditions.
• Compared female responsiveness and preference strengths between unimodal and multimodal stimulus presentations.
• Inferred selection pressures on male calls by comparing preference functions to male call characteristic distributions.

Main Results:

• Female gray treefrogs exhibited greater responsiveness to multimodal stimulus presentations.
• Preferences for temporal call characteristics were weaker in the multimodal condition compared to the unimodal condition.
• Modality interactions were found to modify the female preference functions for male advertisement calls.

Conclusions:

• Interactions between acoustic and visual modalities significantly influence female mate choice in gray treefrogs.
• Multimodal sensory integration can alter the selective landscape for male signal evolution.
• Understanding modality interactions is crucial for comprehending sexual selection dynamics.