Open AccessReproductive and developmental costs of deltamethrin resistance in the Chagas disease vector Triatoma infestans
Author(s) -
Germano Mónica Daniela,
Inés Picollo María
Publication year - 2015
Publication title -
journal of vector ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.688
H-Index - 51
eISSN - 1948-7134
pISSN - 1081-1710
DOI - 10.1111/jvec.12132
Subject(s) - triatoma infestans , biology , deltamethrin , fecundity , chagas disease , vector (molecular biology) , nymph , mating , triatominae , toxicology , triatoma , population , longevity , zoology , trypanosoma cruzi , reduviidae , ecology , hemiptera , pesticide , genetics , virology , demography , parasite hosting , sociology , world wide web , computer science , gene , recombinant dna
ABSTRACT Effective chemical control relies on reducing vector population size. However, insecticide selection pressure is often associated with the development of resistant populations that reduce control success. In treated areas, these resistant individuals present an adaptive advantage due to enhanced survival. Resistance can also lead to negative effects when the insecticide pressure ceases. In this study, the biological effects of deltamethrin resistance were assessed in the Chagas disease vector Triatoma infestans . The length of each developmental stage and complete life cycle, mating rate, and fecundity were evaluated. Susceptible and resistant insects presented similar mating rates. A reproductive cost of resistance was expressed as a lower fecundity in the resistant colony. Developmental costs in the resistant colony were in the form of a shortening of the second and third nymph stage duration and an extension of the fifth stage. A maternal effect of deltamethrin resistance is suggested as these effects were identified in resistant females and their progeny independently of the mated male's deltamethrin response. Our results suggest the presence of pleiotropic effects of deltamethrin resistance. Possible associations of these characters to other traits such as developmental delays and behavioral resistance are discussed.