title: 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.
abstract: BACKGROUND
  Study of the temporal activity of malaria vectors during the implantation of a hydroelectric power station on the River Paraná, intended to generate electrical energy. The river separates the States of São Paulo and Mato Grosso do Sul, in Brazil. The objective was to verify whether alterations occurred in the wealth and diversity indices of Anopheles, following two successive floods, extended to the temporal activity and nycthemeral rhythm followed over a five year period.
  
  
  METHODS
  Mosquito capture was performed monthly using the Human Attraction Technique and Shannon Traps. The first, executed for 24h, provided the nycthemeral rhythm and the second, lasting 15 h, permitted the tracking of Anopheles during the two floods.
  
  
  RESULTS
  The bimodal pattern of Anopheles darlingi defined before these floods was modified throughout the environment interventions. The same effect had repercussions on the populations of An albitarsis s.l., An triannulatus and An galvaoi. Activity prior to twilight was less affected by the environment alterations.
  
  
  CONCLUSIONS
  The dam construction provoked changes in Anopheles temporal activity patterns, permitting classification of the area as an ecologically steady and unstable situation. Differences observed in Anopheles behavior due to the capture methods revealed the influence of solo and multiple attractiveness inside the populations studied.
authors.affiliation: Department of Epidemiology, School of Public Health, University of São Paulo, São Paulo, SP, Brazil.
authors.forename: Almério de Castro
authors.initials: Ade C
authors.lastname: Gomes
authors.forename: Marcia Bicudo de
authors.initials: MB
authors.lastname: Paula
authors.forename: Delsio
authors.initials: D
authors.lastname: Natal
authors.forename: Sabina Léa Davidson
authors.initials: SL
authors.lastname: Gotlieb
authors.forename: Luis Filipe
authors.initials: LF
authors.lastname: Mucci
mesh_terms: D000818:Animals; D000852:Anopheles / Q000145:classification / Q000502:physiology*; D044822:Biodiversity; D001938:Brazil; D002940:Circadian Rhythm / Q000502:physiology*; D055868:Floods; D007303:Insect Vectors / Q000502:physiology*; D011156:Population Density; D011157:Population Dynamics; D011210:Power Plants