Culicidae (Diptera) em área sob influência de construção de represa no Estado de São Paulo

Abstract

OBJECTIVE:To describe the culicidae fauna in an area impacted by environmental changes caused by the construction of a dam. METHODS:The studied area was the Porto Primavera dam construction site in Southeastern Brazil. Monthly culicidae samples were taken in six exploratory sites in the pre-fi lling period and in one fi xed site, one year before (1997)(1998) and after the fi rst fi lling (1999)(2000). Adult mosquitoes were captured in the morning with an aspirator and with Shannon and CDC traps during the evening twilight period. Immature stages were captured using a ladle in the larger breeding sites and with a pipette in the smaller ones. RESULTS:In the pre-fi lling period of the dam, a total of 944 immature culicidae specimens, from ten species, were captured. A total of 14,932 adults were captured, including 7,031 mosquitoes from ten species in the exploratory points and 7,901 specimens from eight genera in the fi xed site. After the fi rst stage of the dam fi lling, the immature stages total was 1,201, from four genera, and the captured mosquitoes total was 5,912, from nine genera. There was a population reduction of the genera Aedes and Psorophora and an increase of the following species populations: Aedeomyia, Anopheles, Culex (Melanoconion), Mansonia and Uranotaenia.

Effects of flooding of the River Paraná on the temporal activity of Anopheles (Nyssorhynchus) darlingi Root (Diptera: Culicidae), at the border state of Mato Grosso do Sul and São Paulo, Brazil

“…For this study, three areas were chosen: location A, situated in the town of Bataguassu in the State of Mato Grosso do Sul, with no direct connection with the flooding; location B, which suffered two successive floods; and location C, which suffered only one, both located in the town of Presidente Epitácio in the State of São Paulo 9,10 . This last location has no direct connection to the dam, since it is formed by a dam on the River Peixe, a tributary of the River Paraná 9 .…”

“…This technique consists of two people waiting for mosquitoes to land on their outfit. The second technique used was the Shannon trap (ST), which has multiple attractive stimulations 9,10 . In stage 1, captures in location A using HAT were conducted for the period from February 1998 to January 1999; captures using ST, in dawn twilight (dST), were conducted from January to November 1998; at location B, HAT was used from July 1997 to 1998.…”

Blood sucking Diptera (Culicidae, Psychodidae, Simuliidae) in forest fragment under impact of dam in the borderland of Rio Grande do Sul and Santa Catarina states, Brazil

“…These modifi cations may alter communities composition and population dynamics of several organisms, including Diptera related to transmission of human diseases, like Culicidae (PAULA & GOMES, 2007), Psychodidae (Phlebotominae) (REZENDE et al, 2009) and Simuliidae (ROSENBERG et al, 1997). In the last decade, many dams were erased along the Uruguai river, however very few data about the Diptera fauna with medical importance as vectorborne disease in this region are available.…”

Culicidae (Diptera) em área de barragem em Santa Catarina e no Rio Grande do Sul

“…Para outras localidades, a composição da fauna culicideana foi mais rica. No entanto, essa variabilidade depende da distribuição geográfica e do grau de preservação ou devastação ambiental (Teodoro et al 1995, Paula & Gomes 2007. Como a área de estudo situa-se em um vale de acentuado grau de degradação e o número de coletas foi reduzido, era esperada uma composição de culicídeos restrita; mesmo assim, 24 espécies foram assinaladas, tanto no ambiente antrópico como no de fragmentos florestais residuais.…”