The evolution of startle displays: a case study in praying mantises

Area of Science:

• Evolutionary Biology
• Animal Behavior
• Predator-Prey Dynamics

Background:

• Anti-predator defenses are often static, but startle displays are dynamic performances involving movements, colors, and sounds.
• The mechanisms, evolutionary drivers, and conditions for the performance and evolution of startle displays remain poorly understood.

Purpose of the Study:

• To conduct the first phylogenetically controlled comparative analyses of startle displays using behavioral data in praying mantises.
• To investigate the evolutionary correlates of startle display presence and complexity, including primary defenses and body size.

Main Methods:

• Phylogenetically controlled comparative analyses were performed on 58 praying mantis species.
• Data on startle displays, morphological traits, behavioral traits, and body size were collected and analyzed.
• Phylogenetic signal strength for display presence and complexity was estimated.

Main Results:

• Startle displays and morphological traits exhibited strong phylogenetic conservation.
• Behavioral components of startle displays were found to be highly labile.
• Body size was not correlated with the presence or complexity of startle displays in phylogenetically controlled analyses.
• Species-rich clades were more likely to possess startle displays.

Conclusions:

• Startle displays appear to be involved in lineage diversification in praying mantises.
• Future research should incorporate quantitative display components, habitat, and predator communities to understand display evolution.
• Understanding startle display evolution is crucial for predator-prey dynamics theory.