Feature saltation and the evolution of mimicry

Area of Science:

• Evolutionary biology
• Behavioral ecology
• Predator-prey dynamics

Background:

• Batesian mimicry involves harmless prey mimicking unpalatable models.
• Previous theories suggested a two-step evolution: a large mutation for approximate similarity, followed by smaller refinements.
• The initial step's mechanism, particularly predator perception, remained unclear.

Purpose of the Study:

• To investigate the initial evolutionary step in Batesian mimicry.
• To understand how predators perceive initial mimicry mutants.
• To explain the origin of imperfect mimicry.

Main Methods:

• Theoretical evolutionary simulations.
• Reconstruction of empirical examples of mimicry evolution.
• Analysis of predator categorization psychology.

Main Results:

• Batesian mimicry can initiate via a mutation conferring a key categorical trait.
• Predators use specific features to categorize prey as unsuitable.
• This feature-based categorization explains imperfect mimicry and allows reconstruction of initial mimetic appearances.

Conclusions:

• Mimicry evolution can start with a single mutation affecting predator categorization (feature saltation).
• Predator psychology, specifically feature-based categorization, is crucial for initiating mimicry.
• The theory explains the common occurrence of imperfect mimicry.