Ethological description of a fixed action pattern in a kissing bug (Triatominae): vision, gustation, proboscis extension and drinking of water and guava

  • Oscar Páez-Rondón
  • Elis Aldana
  • Joseph Dickens
  • Fernando Otálora-Luna
Video Article

Abstract

Triatomines (Heteroptera, Reduviidae) are vectors of Trypanosoma cruzi, the etiological agent of Chagas disease in America. These true bugs have traditionally been considered to be blood suckers, although some species have been catalogued as being entomophagous. By using their highly specialized mouthparts, these insects have evolved a stereotyped habit which includes lifting up the proboscis, piercing and sucking, when the occasion arises. Most triatomines bite their sleeping and unaware vertebrate or invertebrate hosts, but they can also search for other targets, guided, in part, by visual and chemical stimuli. In this study, we observed that triatomines apparently visually identify a drop of water in the distance, then taste it with their legs, upon which proboscis extension and sucking ensues. This invariant behavior or fixed action pattern, observed in several triatomine species (Rhodnius prolixus, Triatoma infestans and Panstrongylus geniculatus), was also elicited by a dummy drop of water and guava fruit. We discuss evolutionary and ethological aspects of this innate behavior. Digital video images related to this article are available at http://www.momo-p.com/showdetail-e.php?movieid=momo180314rp01a and http://www.momo-p.com/showdetail-e.php?movieid=momo180314rp03a.

Keywords

Proboscis-extension reflex Innate releasing mechanism Rostrum Behavioral sequence Intuition Kleptophagy 

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Copyright information

© Japan Ethological Society and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Unidad de Articulación Comunitaria, Centro Multidisciplinario de CienciasInstituto Venezolano de Investigaciones CientíficasMéridaBolivarian Republic of Venezuela
  2. 2.Laboratorio de Entomología “Herman Lent,” Departamento de Biología, Facultad de CienciasUniversidad de Los AndesMéridaBolivarian Republic of Venezuela
  3. 3.Department of BiologyUniversity of RichmondRichmondUSA
  4. 4.Laboratorio de Ecología Sensorial, Centro Multidisciplinario de CienciasInstituto Venezolano de Investigaciones CientíficasMéridaBolivarian Republic of Venezuela

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