Signal verification can promote reliable signalling

Area of Science:

• Evolutionary Biology
• Theoretical Ecology
• Animal Communication

Background:

• Communication theory often attributes signal reliability to the handicap principle, where costly signals deter deception.
• Alternative mechanisms for signal reliability, such as signal verification, remain less theoretically explored.
• Understanding reliability mechanisms is crucial for mutualistic and antagonistic ecological interactions.

Purpose of the Study:

• To model whether signal verification can lead to reliable communication in repeated interactions, specifically in mutualisms.
• To investigate if fruit consumers discriminating between plant qualities can select for reliable fruit signals.
• To determine if strategic signalling costs are a prerequisite for reliable communication.

Main Methods:

• Developed a theoretical model analyzing plant signalling and fruit consumer discrimination in repeated interactions.
• Assumed fixed signalling costs independent of plant quality.
• Simulated scenarios where consumers abandon unprofitable plants to assess reliability selection.

Main Results:

• Identified parameter combinations where discriminating consumers select for signal reliability by abandoning poor-quality plants.
• Demonstrated that consumer self-serving verification behavior imposes indirect costs on unrewarding plants, reducing signalling.
• Showed that reliable communication can emerge without inherent strategic costs to signalling.

Conclusions:

• Signal verification, driven by consumer discrimination, can be a sufficient mechanism for establishing reliable communication.
• This mechanism offers an alternative to costly signalling explanations for reliability in mutualistic consumer-resource interactions.
• The findings have broader implications for understanding reliability in various ecological interactions, including mimicry and aposematism.