Abstract:ABSTRACT. Life cycles compared to Aedes aegypti (Diptera, Culicidae) in the semi-arid region of Paraíba. The present work aims at comparing the life cycle between samples from different populations of Aedes aegypti (Linnaeus, 1762) collected in ten municipalities in the semi-arid region of state of Paraíba, Brazil. The life cycles were studied under 26 ± 2°C, a relative humidity of 60 ± 10% and a 12 h photophase. The development period, egg viability, and larval and pupal survival, were evaluated daily, as wel… Show more
“…Our finding of prolonged times in both larvae and pupae development in three populations is not rare since, for example, larval development times in populations of Ae. aegypti with ranges from 9.15 to 10.89 days have been reported, similar to what we found for Riohacha [ 37 ]. These long development times may represent a disadvantage since larvae and pupae are exposed longer to predators and other factors that can eliminate them and, therefore, may influence the behavior of these populations in the field [ 92 , 93 , 94 ].…”
Section: Discussionsupporting
confidence: 92%
“…The ability of Ae. aegypti to vary its biology and adapt to different environmental conditions can influence population densities, favoring its permanence in areas with virus transmission [ 37 , 38 ]. Thus, Ae.…”
Dengue, Zika, and chikungunya are arboviral diseases for which there are no effective therapies or vaccines. The only way to avoid their transmission is by controlling the vector Aedes aegypti, but insecticide resistance limits this strategy. To generate relevant information for surveillance and control mechanisms, we determined life cycle parameters, including longevity, fecundity, and mortality, of Colombian Ae. aegypti populations from four different geographical regions: Neiva, Bello, Itagüí, and Riohacha. When reared at 28 °C, Bello had the shortest development time, and Riohacha had the longest. Each mosquito population had its own characteristic fecundity pattern during four gonotrophic cycles. The survival curves of each population were significantly different, with Riohacha having the longest survival in both males and females and Bello the shortest. High mortality was observed in mosquitoes from Neiva in the egg stage and for Bello in the pupae stage. Finally, when mosquitoes from Neiva and Bello were reared at 35 °C, development times and mortality were severely affected. In conclusion, each population has a unique development pattern with an innate trace in their biological characteristics that confers vulnerability in specific stages of development.
“…Our finding of prolonged times in both larvae and pupae development in three populations is not rare since, for example, larval development times in populations of Ae. aegypti with ranges from 9.15 to 10.89 days have been reported, similar to what we found for Riohacha [ 37 ]. These long development times may represent a disadvantage since larvae and pupae are exposed longer to predators and other factors that can eliminate them and, therefore, may influence the behavior of these populations in the field [ 92 , 93 , 94 ].…”
Section: Discussionsupporting
confidence: 92%
“…The ability of Ae. aegypti to vary its biology and adapt to different environmental conditions can influence population densities, favoring its permanence in areas with virus transmission [ 37 , 38 ]. Thus, Ae.…”
Dengue, Zika, and chikungunya are arboviral diseases for which there are no effective therapies or vaccines. The only way to avoid their transmission is by controlling the vector Aedes aegypti, but insecticide resistance limits this strategy. To generate relevant information for surveillance and control mechanisms, we determined life cycle parameters, including longevity, fecundity, and mortality, of Colombian Ae. aegypti populations from four different geographical regions: Neiva, Bello, Itagüí, and Riohacha. When reared at 28 °C, Bello had the shortest development time, and Riohacha had the longest. Each mosquito population had its own characteristic fecundity pattern during four gonotrophic cycles. The survival curves of each population were significantly different, with Riohacha having the longest survival in both males and females and Bello the shortest. High mortality was observed in mosquitoes from Neiva in the egg stage and for Bello in the pupae stage. Finally, when mosquitoes from Neiva and Bello were reared at 35 °C, development times and mortality were severely affected. In conclusion, each population has a unique development pattern with an innate trace in their biological characteristics that confers vulnerability in specific stages of development.
“…The transience of breeding grounds, conditioned by the presence of water, necessitates rapid development of the larval and pupal stages, because the need for the cycle to be complete prior to evaporation of the water-containing vessel (CONSOLI and OLIVEIRA, 1994). The development cycle of Ae.aegypti is holometabolous, involving egg phases (resistant up to 450 days), four larval stages (from seven to nine days) and pupa (two to three days), being the temperature a relevant factor in its development, that is, at high temperatures the life cycle of the mosquito is faster (CASTRO et al, 2013;LOPES et al, 2014) and the females lay the eggs in batches of 50 to 500 eggs (CONSOLI and OLIVEIRA, 1994). Ae.…”
Aedes mosquitoes are known to be infected by arboviruses causing disease such as dengue, zika fever, and chikunguya fever, and subsequently transmit them, to humans through the bite of infected females. Chemical control is a measure adopted as part of sustainable management and integrated vector control for public health. There are four principal classes of insecticides used for controlling mosquitoes, all being neurotoxic: organochlorides, organophosphates, carbamates, and pyrethroids. The objective of this work was to review reports on the environmental effects of the insecticides most commonly used for controlling Ae. aegypti. This bibliographic study was conducted using articles and books available in the literature with no time restriction. The databases accessed were: Google Scholar, Pubmed, SciELO, and ScienceDirect. These insecticides exhibit toxicity to the environment, and may accumulate in food and water and in the body of vertebrates. Resistance to different insecticides is a problem when the mode of control is chemical, because insects survive insecticide application and higher doses are necessary for controlling the vectors. Considering these results, the ideal method would be the newly proposed means of mosquitoes control using technology related to modern biotechnology.
“…Há uma concentração deste mosquito nas vilas e cidades, onde há um maior contingente populacional, onde as condições ambientais e sociais contribuem para o estabelecimento de suas populações, embora também possa ser encontrado distante dos aglomerados urbanos (Consoli;Oliveira, 1994;Natal, 2002). O estudo com as diferenças de ciclos biológicos verificadas entre as populações de A. aegypti apresenta capacidade desse inseto sofrer variações na sua biologia e se adaptar às diferentes condições ambientais, favorecendo a permanência deste nessas áreas com aumento do risco de transmissão do vírus da dengue (Castro JR et al, 2013).…”
A eficiência de um programa de controle do Aedes aegypti depende do conhecimento sobre genéticas que ocorrem entre as suas populações. A presente pesquisa teve por objetivo comparar variabilidade genética entre populações de A. aegypti coletadas em diferentes regiões do semiárido paraibano. A análise da estrutura gênica das populações foi realizada através das Extrações de DNAs totais e análise por RAPD-PCR. Os índices de variabilidade genética apresentaram maior diversidade na população de Barra de Santana (P = 93,33 %; Ho = 0,373) e o menor na população de Cuité (P = 60,00%; Ho = 0,171). Em função dos resultados verificou-se que há um padrão diferenciado de desenvolvimento entre as populações de A. aegypti procedentes de diferentes municípios do semiárido paraibano. Os índices de diversidade genética heterozigosidade Ho e polimorfismos sugerem elevada variação genética intrapopulacional e baixa variabilidade interpopulacional. Tal fato pode indicar constantes migrações de vetores para essas localidades com elevado número de indivíduos.
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