Tree holes as larval habitats forAedes aegyptiin urban, suburban and forest habitats in a dengue affected area

Abstract

Aedes aegypti (L.) (Diptera: Culicidae), the main vector of dengue and urban yellow fever in the world, is highly adapted to the human environment. Artificial containers are the most common larval habitat for the species, but it may develop in tree holes and other phytotelmata. This study assessed whether tree holes in San Ramón de la Nueva Orán, a city located in subtropical montane moist forest where dengue outbreaks occur, are relevant as larval habitat for Ae. aegypti and if the species may be found in natural areas far from human habitations. Water holding tree holes were sampled during 3 years once a month along the rainy season using a siphon bottle, in urban and suburban sites within the city and in adjacent forested areas. Larvae and pupae were collected and the presence and volume of water in each tree hole were recorded. Finding Ae. aegypti in forested areas was an isolated event; however, the species was frequently collected from tree holes throughout the city and along the sampling period. Moreover, larvae were collected in considerably high numbers, stressing the importance of taking into account these natural cavities as potential reinfestation foci within dengue control framework.

Linked-read sequencing identifies abundant microinversions and introgression in the arboviral vector Aedes aegypti

“…We have not detected any directional introgression from African Aaf into global Aaa populations, suggesting this may be a concern limited to regions of secondary contact between Aaa and Aaf populations. Yet regions of mixed Aaa/Aaf genotypes and increased phenotypic diversity include areas outside sub-Saharan Africa [43,65] and importation of global Aaa is unlikely to be limited to east Africa and Mauritius, suggesting that this localized concern could become a global one.…”

Redescription of immatures of Dasyhelea flavifrons Guérin-Méneville (Culicomorpha: Ceratopogonidae) and new contribution to the knowledge of its larval habitats

“…The study area has been described in more detail in Mangudo et al (2015). Briefly, Orán is located in the pedemontane floor of the Yungas subtropical montane moist forest (Brown et al 2001), which remains mostly to the east and North of the city.…”

“…Tree holes were located in the city and in yunga forest patches to the north and east of An Acad Bras Cienc (2019) 91(1) e20180047 3 | 14 town, while snail shells were collected from forest patches only. For details on tree holes selection see Mangudo et al (2015Mangudo et al ( , 2018 and for snail shell sampling see Mangudo et al (2017). larvae were preserved in ethanol 80% and pupae were kept alive in the laboratory isolated in plastic vials (2 mm) holding water from the larval habitat and containing a piece of humid filter paper, to maintain the humidity inside the vials, until adult emergence.…”

Study on spatial-temporal distribution and environmental ties of Japanese B Encephalitis’s mosquito vector as well as landing rate in The Olympic forest park

“…The vector population is closed correlated to the environmental factor [9,10], which providing the breeding for larva and resting for adults [11][12][13]. So, studying the correlation of environmental factor with mosquito population could provide corresponded measures for the vector prevention and control.…”