Body size and hosts of Triatoma infestans populations affect the size of bloodmeal contents and female fecundity in rural northwestern Argentina

Autor: María del Pilar Fernández, María C. Cecere, Ricardo E. Gürtler, Joel E. Cohen
Jazyk: angličtina
Rok vydání: 2017
Předmět:
0301 basic medicine
Male
Rural Population
Physiology
Swine
Disease Vectors
Poultry
purl.org/becyt/ford/1 [https]
0302 clinical medicine
Residence Characteristics
key habitats
Medicine and Health Sciences
Body Size
Gamefowl
Triatoma
Triatoma infestans
2. Zero hunger
Mammals
biology
lcsh:Public aspects of medicine
Goats
Temperature
Eukaryota
Ruminants
Fecundity
Body Fluids
Geography
Blood
Infectious Diseases
Physiological Parameters
Vertebrates
Female
Seasons
Anatomy
Rural population
CIENCIAS NATURALES Y EXACTAS
Research Article
Trypanosoma
lcsh:Arctic medicine. Tropical medicine
animal structures
lcsh:RC955-962
Otras Ciencias Biológicas
Animal Types
030231 tropical medicine
Argentina
vector control
Body size
Host-Parasite Interactions
Ciencias Biológicas
Birds
03 medical and health sciences
Dogs
Population Metrics
parasitic diseases
Animals
Humans
Domestic Animals
Chagas Disease
purl.org/becyt/ford/1.6 [https]
Ecosystem
Population Biology
fungi
Public Health
Environmental and Occupational Health
Organisms
Biology and Life Sciences
lcsh:RA1-1270
biology.organism_classification
Insect Vectors
Species Interactions
030104 developmental biology
Fertility
Fowl
Amniotes
Cats
Humanities
Chickens
Zoology
Zdroj: PLoS Neglected Tropical Diseases
PLoS Neglected Tropical Diseases, Vol 11, Iss 12, p e0006097 (2017)
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
ISSN: 1935-2735
1935-2727
Popis: Human sleeping quarters (domiciles) and chicken coops are key source habitats of Triatoma infestans—the principal vector of the infection that causes Chagas disease—in rural communities in northern Argentina. Here we investigated the links among individual bug bloodmeal contents (BMC, mg), female fecundity, body length (L, mm), host blood sources and habitats. We tested whether L, habitat and host blood conferred relative fitness advantages using generalized linear mixed-effects models and a multimodel inference approach with model averaging. The data analyzed include 769 late-stage triatomines collected in 120 sites from six habitats in 87 houses in Figueroa, Santiago del Estero, during austral spring. L correlated positively with other body-size surrogates and was modified by habitat type, bug stage and recent feeding. Bugs from chicken coops were significantly larger than pig-corral and kitchen bugs. The best-fitting model of log BMC included habitat, a recent feeding, bug stage, log Lc (mean-centered log L) and all two-way interactions including log Lc. Human- and chicken-fed bugs had significantly larger BMC than bugs fed on other hosts whereas goat-fed bugs ranked last, in consistency with average blood-feeding rates. Fecundity was maximal in chicken-fed bugs from chicken coops, submaximal in human- and pig-fed bugs, and minimal in goat-fed bugs. This study is the first to reveal the allometric effects of body-size surrogates on BMC and female fecundity in a large set of triatomine populations occupying multiple habitats, and discloses the links between body size, microsite temperatures and various fitness components that affect the risks of transmission of Trypanosoma cruzi.
Author summary The few bug species of Triatominae that have become domesticated are the most important vectors of human Trypanosoma cruzi infection, which causes Chagas disease. Evolutionary theory predicts that the fitness of hematophagous species closely adapted to human habitations should increase with feeding on human hosts and insect body length (L). Testing these hypotheses is important for a better understanding of triatomine population dynamics, identifying key productive habitats, modeling parasite transmission and designing innovative vector control strategies. This study is the first to describe the distributions of L and total individual bloodmeal contents (BMC) of triatomines over bug stages and habitats in rural villages where Chagas disease is endemic, and provides a direct link between individual BMC and female fecundity, host-feeding choices and L. L positively and significantly correlated with other body-size surrogates and was modified by habitat and host associations. Feeding on humans was associated with larger BMC and maximal female fecundity in domestic triatomine populations. Human- and chicken-fed bugs had significantly larger BMC than bugs fed on other hosts. Goat-fed bugs ranked last over all habitats, in agreement with other evidence. This study demonstrates that identifiable habitat-host associations provide nearly optimal resources and conditions for T. infestans.
Databáze: OpenAIRE
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