Early ontogeny social deprivation modifies future agonistic behaviour in crayfish

Area of Science:

• Animal Behavior
• Developmental Biology
• Crustacean Biology

Background:

• Social deprivation early in life causes irreversible behavioral changes in vertebrates.
• The effects of social deprivation are documented in insects like eusocial insects and cockroaches.
• Evidence for social deprivation in crustaceans has been limited.

Purpose of the Study:

• To investigate the effects of social deprivation on subsocial decapod crustaceans.
• To determine if social deprivation in crayfish leads to behavioral alterations comparable to vertebrates.

Main Methods:

• Analysis of video-recorded agonistic encounters of juvenile red swamp crayfish (Procambarus clarkii).
• Comparison of behavioral repertoires, numbers, and frequencies between maternally incubated and isolated crayfish.

Main Results:

• Isolated juvenile crayfish exhibited altered repertoires of agonistic interactions compared to maternally incubated counterparts.
• The frequency and number of agonistic interactions were significantly different between isolated and grouped crayfish.
• Observed behavioral changes in crayfish resemble those documented in vertebrate social deprivation studies.

Conclusions:

• This study provides the first evidence of social deprivation effects in subsocial decapod crustaceans.
• The findings suggest that the social deprivation syndrome is a ubiquitous trait in species with developed maternal care.
• Social isolation in early development can have profound and lasting impacts on behavior across diverse taxa.