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A reduction in ecological niche for Trypanosoma cruzi-infected triatomine bugs

Authors
  • Villalobos, Guiehdani1, 2
  • Nava-Bolaños, Angela2
  • De Fuentes-Vicente, José A.3
  • Téllez-Rendón, Juan Luis4
  • Huerta, Herón4
  • Martínez-Hernández, Fernando1
  • Rocha-Ortega, Maya1
  • Gutiérrez-Cabrera, Ana E.5
  • Ibarra-Cerdeña, Carlos N.6
  • Córdoba-Aguilar, Alex2
  • 1 Hospital General “Dr. Manuel Gea González”, Secretaría de Salud, Mexico City, Mexico , Mexico City (Mexico)
  • 2 Universidad Nacional Autónoma de México, Departamento de Ecología Evolutiva, Instituto de Ecología, Mexico City, Mexico , Mexico City (Mexico)
  • 3 Universidad de Ciencias y Artes de Chiapas, Tuxtla Gutiérrez, Instituto de Ciencias Biológicas, Chiapas, Mexico , Chiapas (Mexico)
  • 4 Instituto de Diagnóstico y Referencia Epidemiológicos, Secretaría de Salud, Mexico City, Mexico , Mexico City (Mexico)
  • 5 CONACyT-Centro de Investigación sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, Mexico , Cuernavaca (Mexico)
  • 6 Centro de Investigación y Estudios Avanzados del IPN (Cinvestav), Unidad Mérida, Departamento de Ecología Humana, Mérida, Yucatán, 97310, Mexico , Mérida (Mexico)
Type
Published Article
Journal
Parasites & Vectors
Publisher
Springer (Biomed Central Ltd.)
Publication Date
May 16, 2019
Volume
12
Issue
1
Identifiers
DOI: 10.1186/s13071-019-3489-5
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundTheory predicts that parasites can affect and thus drive their hosts’ niche. Testing this prediction is key, especially for vector-borne diseases including Chagas disease. Here, we examined the niche use of seven triatomine species that occur in Mexico, based on whether they are infected or not with Trypanosoma cruzi, the vectors and causative parasites of Chagas disease, respectively. Presence data for seven species of triatomines (Triatoma barberi, T. dimidiata, T. longipennis, T. mazzottii, T. pallidipennis, T. phyllosoma and T. picturata) were used and divided into populations infected and not infected by T. cruzi. Species distribution models were generated with Maxent 3.3.3k. Using distribution models, niche analysis tests of amplitude and distance to centroids were carried out for infected vs non-infected populations within species.ResultsInfected populations of bugs of six out of the seven triatomine species showed a reduced ecological space compared to non-infected populations. In all but one case (T. pallidipennis), the niche used by infected populations was close to the niche centroid of its insect host.ConclusionsTrypanosoma cruzi may have selected for a restricted niche amplitude in triatomines, although we are unaware of the underlying reasons. Possibly the fact that T. cruzi infection bears a fitness cost for triatomines is what narrows the niche breadth of the insects. Our results imply that Chagas control programmes should consider whether bugs are infected in models of triatomine distribution.

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