Adaptation to temperate climates: Evidence of photoperiod-induced embryonic dormancy in Aedes aegypti in South America

Fischer, Sylvia; Majo, María Sol De; Battista, Cristian Di; Montini, Pedro; Loetti, Verónica; Campos, Raúl E.

doi:10.1016/j.jinsphys.2019.05.005

Cited by 44 publications

(20 citation statements)

References 59 publications

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“…O controle do Aedes aegypti em ambiente urbano continua sendo um grande desafio mundial. A grande capacidade de adaptação do mosquito, alterações em seus hábitos de vida como oviposição em água insalubre, alterações de horário de repasto sanguíneo e resistência a inseticidas estão entre algumas dificuldades encontradas [12][13][14][15] .…”

Section: Discussionunclassified

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

et al. 2020

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Introdução: a intermitência ou deficiência da oferta de água pode ser considerada uma condição de vulnerabilidade para a reprodução do Aedes aegypti. Objetivo: avaliar a efetividade do uso de capas para proteção de reservatório de água, como estratégia de controle do Aedes aegypti. Metodologia: estudo de intervenção não controlado, realizado entre os anos 2015 e 2016, em um bairro do município de Riachão do Jacuípe, localizado na macrorregião centro-leste do estado da Bahia, Brasil. A coleta de dados aconteceu em quatro momentos: visita inicial para avaliação da necessidade de capas e pesquisa de larvas nos reservatórios existentes, seguida de três visitas para monitoramento e inspeção dos reservatórios de água beneficiados com as capas protetoras. O tratamento químico foi aplicado, quando necessário. As visitas foram realizadas durante nove meses, com intervalos de 45 a 60 dias. O estudo foi aprovado pelo CEP/UNEB, Parecer número 1.066.424, CAAE 33095114.0.0000.0057. Resultados: foram pesquisados 273 reservatórios de água (capacidade de 200L, 250L, 500L e 1000L) destes, 87,2% permaneceram com as capas em todas as três visitas de monitoramento. Entre os que apresentaram larvas de mosquitos, incluindo Aedes aegypti, 55,6% não apresentavam capa ou estavam dispostas de maneira inadequada. Observou-se, também, incremento de positividade da presença de larvas entre aqueles que se encontravam com capas colocadas, adequadamente, no momento da visita. Conclusão: a aplicação de capas de poliéster em reservatórios de água como estratégia de controle vetorial pode não ser efetiva se não ocorrer uma vigilância constante sobre o uso correto.

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Section: Discussionunclassified

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

et al. 2020

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“…A recent study showed a lower hatching response of Ae. aegypti eggs from Buenos Aires (Argentina) with a shortday parental photoperiod, and a trend to higher hatching with longer egg storage time in all different photoperiod treatment combinations [44]. These authors suggested that Ae.…”

Section: High-resolution Experimental Designmentioning

confidence: 96%

“…These authors suggested that Ae. aegypti might have adapted to local climatic conditions which may have or can also cause the evolution of diapause [44]. Thus, experiments on the diapause of Ae.…”

Section: High-resolution Experimental Designmentioning

confidence: 99%

Does winter cold really limit the dengue vector Aedes aegypti in Europe?

et al. 2020

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Background: Aedes aegypti is a potential vector for several arboviruses including dengue and Zika viruses. The species seems to be restricted to subtropical/tropical habitats and has difficulties in establishing permanent populations in southern Europe, probably due to constraints during the winter season. The aim of this study was to systematically analyze the cold tolerance (CT) of Ae. aegypti in its most cold-resistant life stage, the eggs. Methods: The CT of Ae. aegypti eggs was compared with that of Ae. albopictus which is well established in large parts of Europe. By systematically studying the literature (meta-analysis), we recognized that CT has been rarely tested in Ae. aegypti eggs, but eggs can survive at zero and sub-zero temperatures for certain exposure periods. To overcome potential bias from experimental differences between studies, we then conducted species comparisons using a harmonized high-resolution CT measuring method. From subtropical populations of the same origin, the survival (hatching in %) and emergence of adults of both species were measured after zero and sub-zero temperature exposures for up to 9 days (3 °C, 0 °C and − 2 °C: ≤ 9 days; − 6 °C: ≤ 2 days). Results: Our data show that Ae. aegypti eggs can survive low and sub-zero temperatures for a short time period similar to or even better than those of Ae. albopictus. Moreover, after short sub-zero exposures of eggs of both species, individuals still developed into viable adults (Ae. aegypti: 3 adults emerged after 6 days at − 2 °C, Ae. albopictus: 1 adult emerged after 1 day at − 6 °C). Conclusions: Thus, both the literature and the present experimental data indicate that a cold winter may not be the preventing factor for the re-establishment of the dengue vector Ae. aegypti in southern Europe.

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“…A recent study suggested that local Ae. aegypti specimens from the temperate city of Buenos Aires can inhibit egg hatching when parents were exposed to short‐day photoperiods (Fischer et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Temperature and photoperiod effects on dormancy status and life cycle parameters in Aedes albopictus and Aedes aegypti from subtropical Argentina

Garzón

Maffey

Lizuain

et al. 2020

Medical Vet Entomology

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Aedes albopictus (Diptera: Culicidae) distribution is bounded to a subtropical area in Argentina, while Aedes aegypti (Diptera: Culicidae) covers both temperate and subtropical regions. We assessed thermal and photoperiod conditions on dormancy status, development time and mortality for these species from subtropical Argentina. Short days (8 light : 16 dark) significantly increased larval development time for both species, an effect previously linked to diapause incidence. Aedes albopictus showed higher mortality than Ae. aegypti at 16 °C under long day treatments (16 light : 8 dark), which could indicate a lower tolerance to a sudden temperature decrease during the summer season. Aedes albopictus showed a slightly higher percentage of dormant eggs from females exposed to a short day, relative to previous research in Brazilian populations. Since we employed more hours of darkness, this could suggest a relationship between day‐length and dormancy intensity. Interestingly, local Ae. aegypti presented dormancy similar to Ae. albopictus, in accordance with temperate populations. The minimum dormancy in Ae. albopictus would not be sufficient to extend its bounded distribution. We believe that these findings represent a novel contribution to current knowledge about the ecophysiology of Ae. albopictus and Ae. aegypti, two species with great epidemiological relevance in this subtropical region.

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Adaptation to temperate climates: Evidence of photoperiod-induced embryonic dormancy in Aedes aegypti in South America

Cited by 44 publications

References 59 publications

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

Efetividade do uso de capas em reservatórios de água para prevenção de Aedes aegypti

Does winter cold really limit the dengue vector Aedes aegypti in Europe?

Temperature and photoperiod effects on dormancy status and life cycle parameters in Aedes albopictus and Aedes aegypti from subtropical Argentina

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