Conspecific attraction and shelter selection in gregarious insects

Area of Science:

• Ecology
• Animal Behavior
• Behavioral Ecology

Background:

• Habitat selection is often non-uniform due to conspecific presence, even in equally viable habitats.
• Group-living species integrate social cues and environmental resources for settlement decisions.
• The interplay between social attraction and individual resource preferences in habitat choice remains an area of investigation.

Purpose of the Study:

• To investigate the interactive effects of conspecific attraction and individual resource preferences on habitat selection.
• To determine the relative importance of social cues versus environmental resource preferences in group-living species.
• To examine how social context influences refuge choice in cockroaches.

Main Methods:

• Experiments were conducted using groups of cockroaches (nymphs and adult males) in controlled environments.
• Shelters of varying sizes, scaled to nymph and adult male dimensions, were offered to single-sex and mixed-sex groups.
• A numerical model was developed and parameterized using experimental data to simulate individual spatial distribution.

Main Results:

• Male cockroach refuge choices remained consistent regardless of social context.
• Nymphs exhibited a shift in shelter preference, with the presence of males overriding their affinity for size-scaled shelters.
• The numerical model suggested that differential attraction based on body size and social context explains observed spatial distributions.

Conclusions:

• Social context significantly influences habitat selection decisions in group-living species.
• In cockroaches, social attraction, particularly the presence of larger individuals (males), can override individual preferences for environmental resources.
• The findings provide a framework for understanding how social dynamics shape spatial distributions across various scales.