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Differential inhibition of egg hatching in Aedes aegypti populations from localities with different winter conditions

Published online by Cambridge University Press:  27 November 2020

Raúl E. Campos
Affiliation:
Instituto de Limnología ‘Dr Raúl A. Ringuelet’, Universidad Nacional de La Plata-CONICET, CCT La Plata, Boulevard 120 y 62, No. 1437, La Plata (B 1900), Buenos Aires, Argentina
Gabriela Zanotti
Affiliation:
Departamento de Ecología, Genética y Evolución, and Instituto IEGEBA (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, 4to piso, Laboratorio 54, C1428EHA, Buenos Aires, Argentina
Cristian M. Di Battista
Affiliation:
Instituto de Limnología ‘Dr Raúl A. Ringuelet’, Universidad Nacional de La Plata-CONICET, CCT La Plata, Boulevard 120 y 62, No. 1437, La Plata (B 1900), Buenos Aires, Argentina
Javier O. Gimenez
Affiliation:
Instituto de Medicina Regional, Área de Entomología, Universidad Nacional del Nordeste (UNNE), Avda. Las Heras, 727, 3500, Resistencia, Chaco, Argentina
Sylvia Fischer*
Affiliation:
Departamento de Ecología, Genética y Evolución, and Instituto IEGEBA (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, 4to piso, Laboratorio 54, C1428EHA, Buenos Aires, Argentina
*
Author for correspondence: Sylvia Fischer, Email: sylvia@ege.fcen.uba.ar

Abstract

In Argentina, the mosquito Aedes aegypti (L.) (Diptera: Culicidae) is distributed from subtropical to temperate climates. Here, we hypothesized that the expansion of Ae. aegypti into colder regions is favoured by high-phenotypic plasticity and an adaptive inhibition of egg hatching at low temperatures. Thus, we investigated the hatching response of eggs of three populations: one from a subtropical region (Resistencia) and two from temperate regions (Buenos Aires City and San Bernardo) of Argentina. Eggs collected in the field were raised in three experimental colonies. F1 eggs were acclimated for 7 days prior to immersion at 7.6 or 22°C (control eggs). Five immersion temperatures were tested: 7.6, 10.3, 11.8, 14.1 and 16°C (range of mean winter temperatures of the three localities). A second immersion at 22°C was performed 2 weeks later to assess the inhibition to hatch under favourable conditions. After the first immersion, we compared the proportions of hatched eggs and dead larvae among treatment levels, whereas after the second immersion we compared the hatching response among the three populations. The factors that most influenced the egg hatching response were the geographical origin of the populations and the immersion temperature, but not the acclimation temperature. The proportions of hatching and larval mortality at low temperatures were higher for Resistencia than for Buenos Aires and San Bernardo, whereas the hatching response at ambient temperature was lower for San Bernardo than for Buenos Aires and Resistencia. The results support the hypothesis that populations from colder regions show an adaptive inhibition of egg hatching.

Type
Research Paper
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press.

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