Population size regulation is density-dependent in Rhodnius prolixus (Hemiptera: Reduviidae) through an irritability mechanism.

Background: Physical factors can determine the level of triatomine abundance, but do not regulate their population densities, and neither do natural enemies.

Objectives: To identify the processes associated with density-dependent triatomine population regulation.

Methods: We set-up a laboratory experiment with four interconnected boxes; the central box harbored Rhodnius prolixus bugs and one hamster.