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

被引:9
作者
Campos, Raul E. [1 ]
Zanotti, Gabriela [2 ,3 ]
Di Battista, Cristian M. [1 ]
Gimenez, Javier O. [4 ]
Fischer, Sylvia [2 ,3 ]
机构
[1] Univ Nacl La Plata, Inst Limnol Dr Raul Ringuelet, CONICET, CCT La Plata, Blvd 120 & 62 1437, RA-1437 Buenos Aires, DF, Argentina
[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ecol Genet & Evolut, Ciudad Univ,Pabellon 2,4To Piso,Lab 54, Buenos Aires, DF, Argentina
[3] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Inst IEGEBA, UBA CONICET, Ciudad Univ,Pabellon 2,4To Piso,Lab 54, Buenos Aires, DF, Argentina
[4] Univ Nacl Nordeste UNNE, Inst Med Reg, Area Entomol, Avda Heras 727, RA-3500 Chaco, Argentina
关键词
Acclimation; Aedes aegypti; Argentina; hatching response; low temperature; mortality; DIPTERA-CULICIDAE; PHOTOPERIODIC RESPONSE; STEGOMYIA AEGYPTI; BUENOS-AIRES; TEMPERATURE; MOSQUITO; RECORDS; SURVIVAL; DENGUE; CHIKUNGUNYA;
D O I
10.1017/S0007485320000681
中图分类号
Q96 [昆虫学];
学科分类号
摘要
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 degrees C (control eggs). Five immersion temperatures were tested: 7.6, 10.3, 11.8, 14.1 and 16 degrees C (range of mean winter temperatures of the three localities). A second immersion at 22 degrees 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.
引用
收藏
页码:323 / 330
页数:8
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