Context-dependent discrimination and the evolution of mimicry.

Area of Science:

• Evolutionary Biology
• Behavioral Ecology
• Game Theory

Background:

• Mimetic organisms evolve close resemblances, challenging identification based on appearance alone.
• Subtle differences in activity patterns, behavior, or microhabitat use can offer additional identification cues.
• Signal receivers' ability to flexibly adjust response thresholds based on external cues is known but its effect on signalers is less understood.

Purpose of the Study:

• To investigate the impact of context-dependent discrimination by signal receivers on the evolution of mimicry.
• To model how external background cues influence signal receiver decision-making in distinguishing mimics from models.
• To explore the consequences for signalers (mimics and models) when receivers can adjust their discrimination thresholds.

Main Methods:

• Development of an optimality model for mimetic discrimination.
• Incorporation of signal receiver's ability to obtain information from external background cues.
• Analysis of how flexible response thresholds affect signaler-receiver interactions and evolutionary outcomes.

Main Results:

• The presence of external cues can lead to varied outcomes: benefiting models, harming mimics, harming both, or benefiting both, contingent on ecological factors.
• Context-dependent discrimination can significantly alter mimetic evolution, especially when mimetic traits are costly or mimics are related to neighbors.
• Small-scale synchrony in model and mimic activity patterns is a key factor in context-dependent discrimination.

Conclusions:

• External cues and flexible discrimination by signal receivers introduce complex dynamics into mimicry evolution.
• The evolutionary trajectory of mimicry is sensitive to ecological context, signaler traits, and receiver behavior.
• Understanding context-dependent discrimination is crucial for a comprehensive view of mimicry systems and their evolutionary stability.