title: Effect of the physiognomy of Attalea butyracea (Arecoideae) on population density and age distribution of Rhodnius prolixus (Triatominae).
abstract: BACKGROUND
  Rhodnius prolixus Stål, 1859 is one of the main vectors of Trypanosoma (Schyzotrypanum) cruzi Chagas, 1909. In its natural forest environment, this triatomine is mainly found in palm tree crowns, where it easily establishes and develops dense populations. The aim of this study was to evaluate the effect of the physiognomy and reproductive status of Attalea butyracea on the population relative density and age structure of R. prolixus and to determine the vector's population stratification according to the vertical and horizontal profile of an A. butyracea forest.
  
  
  METHODS
  Using live bait traps, 150 individuals of A. butyracea with different physiognomy and 40 individuals with similar physiognomy (crown size, number of leaves, palm tree height, diameter at breast height, reproductive status) were sampled for triatomines in Yopal, Casanare-Colombia. Temperature and relative humidity were measured in the crown of the palm tree. Entomological indices and natural infection rates were also determined.
  
  
  RESULTS
  The relative population density of R. prolixus on natural A. butyracea groves is associated with the palm's height, number of leaves and crown volume. The young immature stages were present mostly at the crown's base and the advanced immature stages and adults were present mostly at the crown of the palm tree. This distribution correlates with the temperature stability and relative humidity in the base and the fluctuation of both environmental variables in the palm's crown. A higher density of R. prolixus was found as the palm tree height increased and as the distance of the palm with respect to the forest border decreased, especially towards anthropically intervened areas. A density index of 12.6 individuals per palm tree with an infestation index of 88.9% and a colonization index of 98.7% was observed. 85.2% was the infection index with T. cruzi.
  
  
  CONCLUSIONS
  The physiognomy of palm trees affects the relative population density and the distribution of developmental stages of R. prolixus. Therefore, they constitute a risk factor for the potential migration of infected insects from wild environments towards residential environments and the subsequent epidemiological risk of transmission of T. cruzi to people.
authors.affiliation: Centro de Investigaciones en Microbiología y Parasitología Tropical - CIMPAT, Universidad de los Andes, Carrera 1 No. 18A-10, Bloque A, Bogotá, Colombia. plurbanus@gmail.com.
authors.forename: Plutarco
authors.initials: P
authors.lastname: Urbano
authors.affiliation: Centro de Investigaciones en Microbiología y Parasitología Tropical - CIMPAT, Universidad de los Andes, Carrera 1 No. 18A-10, Bloque A, Bogotá, Colombia. cristinapovedac@gmail.com.
authors.forename: Cristina
authors.initials: C
authors.lastname: Poveda
authors.affiliation: Centro de Investigaciones en Microbiología y Parasitología Tropical - CIMPAT, Universidad de los Andes, Carrera 1 No. 18A-10, Bloque A, Bogotá, Colombia. jmolina@uniandes.edu.co.
authors.forename: Jorge
authors.initials: J
authors.lastname: Molina
mesh_terms: D000818:Animals; D028023:Arecaceae / Q000469:parasitology* / Q000502:physiology*; D003105:Colombia; D045303:Cytochromes b / Q000235:genetics; D008969:Molecular Sequence Data; D011156:Population Density; D012239:Rhodnius / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D017422:Sequence Analysis, DNA
chemical_list: D045303:Cytochromes b