Animal personality aligns task specialization and task proficiency in a spider society.

Area of Science:

• Behavioral Ecology
• Animal Social Systems
• Evolutionary Biology

Background:

• Classic division of labor theories assume task specialization increases proficiency.
• This assumption may not apply to animal societies lacking distinct worker castes.
• The spider Anelosimus studiosus exhibits docile and aggressive female phenotypes instead of castes.

Purpose of the Study:

• To investigate task performance and proficiency in mixed-phenotype colonies of Anelosimus studiosus.
• To determine if behavioral phenotypes align with specific task proficiencies.
• To understand the role of division of labor in maintaining within-colony variation.

Main Methods:

• Observing task participation (prey capture, web building, parental care, defense) in mixed-phenotype colonies.
• Measuring individual performance outcomes for each phenotype in isolation.
• Analyzing the heritability of docile and aggressive phenotypes.

Main Results:

• Aggressive females showed higher participation and proficiency in prey capture, web building, and colony defense.
• Docile females showed higher participation and proficiency in parental care and brood rearing.
• Task propensity and proficiency were adaptively aligned with behavioral phenotypes.

Conclusions:

• Division of labor based on heritable behavioral phenotypes enhances colony efficiency in Anelosimus studiosus.
• Behavioral specialization, rather than morphological castes, can drive adaptive division of labor.
• Within-colony variation is maintained by the benefits of specialized task performance.