Studies on mosquitoes (Diptera: Culicidae) and anthropic environment: 3- Survey of adult stages at the rice irrigation system and the emergence of Anopheles albitarsis in South-Eastern, Brazil

Abstract

A study of adult Culicidae ecology was carried out from January 1992 through January 1993 at the rice irrigation system of the Ribeira Valley Experimental Station. The adaptation of Anopheles albitarsis to the anthropic environment became evident through the adult collections made at its various habitats represented by the irrigation system and the edge of the residual pond, as well as at those made within the local patchy residual woods. Other potential disease vectors were prevalent in the irrigated system too. There were Aedes scapularis, Culex nigripalpus and Cx. ribeirensis that were collected at various habitats. Remarkable differences among their prevalences were obtained such as between the natural forest and anthropic environments. In the former An. albitarsis was practically non-existent, thus suggesting that it might be considered as eusynathropic. As the populations of other species seemed to increase in the anthropic environment, they may be regarded as hemisynanthropes. Observations suggest the hypothesis that the development of irrigated land may be a factor in the emergence of An. albitarsis, and some other species, as well as the possibility of an increase in the transmission of mosquito-borne diseases such as malaria.

Studies on entomological monitoring: mosquito species frequency in riverine habitats of the Igarapava Dam, Southern Region, Brazil

“…Anopheles albitarsis s.l. is also dominant in anthropic agricultural environment in our region and as pointed out by FORATTINI et al 9 seems to alternate and to be related to flooding and emptying in rice paddies. In our study, we remind the forest patch is riparian and it is surrounded by breeding sites from the river banks and from pasture, so females from An.…”

“…Other studies focusing on the anopheline species were made to verify if the reservoirs were favorable breeding places to Anopheles darlingi when malaria was endemic in São Paulo 4,5,21 . Afterwards, studies to know the mosquito vector species potentially involved on the transmission and epidemiology of malaria and sylvatic arboviruses were performed mainly before the construction and flooding of dams 2,6,9,20,26,27 .…”

Mosquito Frequency and Feeding Habits in an Enzootic Canine Dirofilariasis Area in Niterói, State of Rio de Janeiro, Brazil

“…Ae. scapularis was also shown to feed on human, canine and feline hosts, besides being regarded as a hemisynanthropic species (Forattini et al 1987b(Forattini et al , 1993(Forattini et al , 1995.…”

Studies on mosquitoes (Diptera: Culicidae) and anthropic environment: 7- Behaviour of adults Nyssorhynchus anophelines with special reference to Anopheles albitarsis s.l. in South-Eastern Brazil

“…Adult collections were performed at an Experimental Station (ES) described in Forattini et al 9,10,11 (1993,1994). Outdoor and indoor adult collections were carried out at ES area in rural dwellings of the "Sitio Barra do Capinzal" (BC) (Forattini et al 9 , 1993), a site nearly one kilometer, in a straight line, away from the rice paddies.…”

“…Outdoor and indoor adult collections were carried out at ES area in rural dwellings of the "Sitio Barra do Capinzal" (BC) (Forattini et al 9 , 1993), a site nearly one kilometer, in a straight line, away from the rice paddies. For purposes of comparison, collections were made also at an area known as "Sítio Galiléia" (GA).…”