Preliminary data on the performance of Aedes aegypti and Aedes albopictus immatures developing in water-filled tires in Rio de Janeiro

Dengue fever has become the most important vector-borne viral disease in Brazil. Human facilitated transport of desiccation-resistant eggs has led to its two most important vectors, Aedes aegypti and Ae. albopictus, becoming widespread. In this paper, we report seasonal and spatial variation in larval abundances of Ae. aegypti and Ae. albopictus across a small-scale transition zone between an urban area and an urban wooded/forested area within Rio de Janeiro, Brazil. We installed 400 ovitraps across 10 sites with different human population densities and vegetation coverage. Eggs and larvae were collected for three weeks during the wet and dry seasons of 2002 and 2003. Ae. albopictus was predominantly found in the forested areas of the study site whereas in the urbanized area Ae. aegypti was more abundant. Both species peaked during the wet season. This distribution pattern, which may reflect adult flight range, may favor the co-occurrence of larvae of these species in a small-scale urban/urban forest transition zone.

show abstract

“…albopictus (Figures 2, 3, and 6). This is in concordance with previous studies in Rio de Janeiro 6 . In the dry season of 2002, Ae.…”

Section: Discussionsupporting

confidence: 94%

“…aegypti and Ae. albopictus are sympatric species that tend to breed in similar sites, most commonly in artificial containers 5,6 . Inter-specific competition between these species has been documented.…”

Section: Introductionmentioning

confidence: 99%

The spatial distribution of Aedes aegypti and Aedes albopictus in a transition zone, Rio de Janeiro, Brazil

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…Dibo et al 43 , by means of weekly collections of eggs and larvae in the city of Mirassol, state of São Paulo, Southeastern region of Brazil, from November 2004 to November 2005, confirmed the results that have already been described here about Ae. aegypti proliferation, which shows that the number of eggs, larvae and mosquitoes is larger in periods of higher temperatures and rainfall indexes 25,26,37,44 .…”

Section: Rainfallmentioning

confidence: 99%

“…Many studies that employed entomological surveys 22,23,26,29,[37][38][39] have shown higher values of infestation of eggs, larvae and vectors in the rainy period; however, the positive breeding sites persist in the drought period, a fact that is favored by the mosquito's facility to adapt to the human environment, through natural and/or artificial reservoirs 31,34,40,41 . The rainfall data referring to the months of highest number of notification of cases showed a slight relationship among one another.…”

Section: Rainfallmentioning

confidence: 99%

A ocorrência da dengue e variações meteorológicas no Brasil: revisão sistemática

Viana

Ignotti

2013

Rev. bras. epidemiol.

102

View full text Add to dashboard Cite

Introduction: Dengue is configures in recent decades as an important cause of morbidity and mortality in Brazil and around the world reaching the tropical and subtropical areas. Objective: To review the scientific literature on the occurrence of dengue in Brazil and its relationship with meteorological variables. Method: A systematic review of studies published in databases (SciELO, PubMed, MEDLINE, Lilacs) using descriptors related to weather variations and dengue fever in Brazil, published between 1991 to 2010. It was selected 31 articles that had the study area nationwide. Results: Most epidemiological studies use ecological design, the studies make use of entomological trapping, are common also series of studies of the disease and spatial analysis. It is evident relationship between dengue incidence with temperature and rainfall, the association is more significant from the second to fourth months of the year. Comparative studies of drought and rain show seasonal behavior of the disease. There are difficulties in establishing unique pattern of seasonality of disease incidence and weather variables for the country. Conclusion: Dengue is strongly related to meteorological variables. The seasonal variation in temperature and rainfall influences the dynamics of the vector and the incidence of the disease throughout the country, regardless of the climate category. The number of cases of classic dengue and of dengue hemorrhagic fever has been increasing on an annual basis. It is estimated that 550 thousand hospitalizations with 20 thousand deaths occur per year among a total of approximately 2.5 billion exposed people 4,5 , and an average of 80 million new cases are reported every year 2 . KeywordsAs a reemerging endemic or pandemic disease, it occurs practically in all the tropical and subtropical regions of the planet 1 . The countries located in these regions are more susceptible due to diverse conditioning factors, such as: global changes, climate changes, weather variability, land use, water storage and irrigation, human population growth and urbanization 6 . Such factors, among others, significantly contribute to the proliferation and development of the Aedes aegypti mosquito -the virus vector 7-9 . Climate changes contribute to increase the number of people exposed to dengue to more than 2 billion and the projections for 2085 suggest that approximately 5 to 6 billion people (50 to 60% of the world's population) will be at risk regarding the disease transmission 10 .The seasonal dynamics of the dengue vector is commonly associated with climate changes and fluctuations 9,11 , which include: temperature increase and variations in rainfall and relative air humidity, conditions that favor a higher number of available breeding sites and, consequently, the development of the vector. The latter presents two distinct stages: aquatic, with the development phases of egg, larva and pupa, and terrestrial, which corresponds to the adult mosquito. Both stages are subject to environmental and climate changes 12,13 ...

show abstract

“…It is very difficult to control these vectors due to their remarkable ability to adapt to various environments, their close contact with humans, and their reproductive biology. The rich organic content, stagnant water, low illumination, and small orifice of the coconut shells in rubber plantations favor intense breeding (Honorio et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF Gliricidia sepium LEAVES EXTRACTS ON Aedes aegypti: LARVICIDAL ACTIVITY

Krishnaveni¹,

ThaiyalNayaki²,

Balasubramanian³

2015

View full text Add to dashboard Cite

Mosquitoes are the single most important group of insects in terms of the public health significance and causing diseases. They are the vectors for the transmission of many viral pathogens and pose serious threat to human health. Chemical insecticides are widely used, but they are non-selective and harmful to beneficial organisms. In the present study, Gliricidia sepium leaves extracts were used to analyze its effect against Aedes aegypti, to compare the mortality rate while using different solvent extracts of the leaf, to identify the solvent extract which give a high rate of larval mortality, and to characterize the compounds present in the corresponding leaf extract using phytochemical analysis. The ethanolic extract of G. sepium leaves constitutes flavonoids, steroids, glycoside, carbohydrate, and saponins compound. Thus, it was found to have an inhibitory effect on the growth of larvae than other solvent extracts. In the statistical analysis, the highest significant difference was observed between 1.5 and 2.0 g/l concentration of ethanolic extract and other extracts. However, no significant difference was observed in other concentrations. The larvicidal activity of the plant extract may be attributed to the presence of active compounds such as terpenoids, saponins, and steroids.

show abstract

Preliminary data on the performance of Aedes aegypti and Aedes albopictus immatures developing in water-filled tires in Rio de Janeiro

Cited by 29 publications

References 14 publications

The spatial distribution of Aedes aegypti and Aedes albopictus in a transition zone, Rio de Janeiro, Brazil

The spatial distribution of Aedes aegypti and Aedes albopictus in a transition zone, Rio de Janeiro, Brazil

A ocorrência da dengue e variações meteorológicas no Brasil: revisão sistemática

EFFECT OF Gliricidia sepium LEAVES EXTRACTS ON Aedes aegypti: LARVICIDAL ACTIVITY

Contact Info

Product

Resources

About