Tiger moth responses to a simulated bat attack: timing and duty cycle

Area of Science:

• Ecology
• Bioacoustics
• Animal Behavior

Background:

• Night-flying insects, like tiger moths, use escape maneuvers against bat attacks.
• Tiger moths emit sounds as a defense, potentially to jam bat echolocation or warn of toxicity (aposematism).
• The jamming hypothesis predicts moth sounds are most effective when timed with the final bat attack phase.

Purpose of the Study:

• To investigate the temporal response of tiger moths to simulated bat echolocation attacks.
• To test predictions of the jamming hypothesis regarding moth acoustic signaling timing and duty cycle.

Main Methods:

• Playback of bat echolocation attack sequences to a group of tiger moths.
• Recording and analyzing the timing and characteristics of tiger moth acoustic responses.

Main Results:

• Tiger moths responded to bat attack sequences with a significant delay, peaking well before the terminal attack phase.
• Moth responses occurred outside the predicted timing for maximum jamming efficacy.
• No correlation was found between the duty cycle of moth calls and their temporal response patterns.

Conclusions:

• The study's findings challenge the current assumptions of the jamming hypothesis for tiger moth acoustic defense.
• The results suggest that the timing of tiger moth calls may not be optimized for jamming bat echolocation.
• Further research is needed to determine the actual function of tiger moth sounds in bat-moth interactions.