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1 June 2015 Reproductive and Developmental Costs of Deltamethrin Resistance in the Chagas Disease Vector Triatoma infestans
Mónica Daniela Germano, María Inés Picollo
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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.

Mónica Daniela Germano and María Inés Picollo "Reproductive and Developmental Costs of Deltamethrin Resistance in the Chagas Disease Vector Triatoma infestans," Journal of Vector Ecology 40(1), 59-65, (1 June 2015).
Received: 3 September 2014; Accepted: 1 December 2014; Published: 1 June 2015

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deltamethrin resistance
developmental delay
fitness cost
life cycle
Triatoma infestans
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