Água de abastecimento público de consumo humano e oviposição de Aedes aegypti

Abstract

OBJECTIVE:To evaluate the effect of the quality of publicly supplied water in domestic water tanks on egg laying by female Aedes aegypti. METHODS:Laboratory study on immature Ae. aegypti, collected from watertanks in the municipality of Potim, SP, Southeastern Brazil. Each cage contained three types of water in which eggs could be laid: Three choice per test were simultaneously used to deposit the eggs, ovipositor (A) with water collected from a water tank in Taubaté, ovipositor (B) with distilled water (control) and ovipositor (C) water collected from a water tank in the municipality of Potim. Physiochemical parameters were analyzed. The Kruskall-Wallis test was used to analyze the mean number of eggs in each water sample and the Dwass-SteelCritchlow-Fligner test was used in making comparisons. To evaluate egg laying, an ovipositional activity index was adopted. RESULTS:A signifi cant difference in the number of eggs was found between the liquid solutions tested (H = 45; p < 0.0001). The number of eggs found in water tank samples originating from deep wells (C), was statistically superior to water samples from water tanks originating from superfi cial wells (A) (p < 0.0001) and from the Control (C) p < 0.0001. There was no signifi cant difference between the number of eggs in Control (B) and the surface water (A). In all three tests, the fi rst position was the most productive in all tested solutions. Only water sample (C) produced a positive index (0.54), i.e., attractive to egg laying. CONCLUSIONS:Water quality infl uences egg laying by Aedes aegypti. The high concentrations of ammonium nitrate in public water supplies suggest that this chemical component was responsible for attracting pregnant female Aedes aegypti to lay eggs in these environments.

Larvicidal activity of Syzygium aromaticum (L.) Merr and Citrus sinensis (L.) Osbeck essential oils and their antagonistic effects with temephos in resistant populations of Aedes aegypti

“… Marques et al (2013) reported the oviposition index (OI), ranging from -1 to +1, to evaluate oviposition-attractant or -repellent substances. A positive OI means that the substance has an attractant activity, while a negative value means the substance has a repellent activity.…”

“…The oviposition index (OI, Equation 2) was used to evaluate the oviposition response of females to different sites of oviposition ( Marques et al. 2013 ).…”

Perfuração Indiscriminada de Poços em Iracema/CE: Um Estudo Sobre o Paradoxo da Atual Crise Hídrica

“…Esta, exigiu a utilização de uma rede que transportasse determinada quantidade de água por habitante, diária e continuamente e de qualidade adequada. No entanto, foi no século vinte, devido em grande parte à generalizada expansão dos centros urbanos, que enormes investimentos em sistemas de distribuição de água foram dispendidos (MARQUES, 2013).…”

“…Segundo Marques (2013), logo no início, principalmente em países desenvolvidos, havia o entendimento de que quanto mais elevadas fossem as captações, maior o nível de vida das populações. Ou seja, quanto mais se consumisse, melhor.…”

Prevention of Dengue Hemorrhagic Fever (DHF) Associated with the Aedes aegypti Larvae Presence based on the Type of Water Source

“…It is determined by observations of various physical and chemical parameters [9]. A research by Gisela, et al [10] concluded that the water quality can affect the laying of eggs by the mosquito of A. aegypti. The mosquito's eggs will develop under conditions suitable with water characteristics.…”