Anopheles cruzii parity in dense rain forest in Southern Brazil

To determine the parity and ovarian development of Anopheles cruzii species during the seasons. Collections were carried out fortnightly in the morning in the Palmito State Park in the municipality of Paranaguá, Southern Brazil, between April 2004 and April 2005. Adult mosquitoes were captured using...

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Bibliographic Details
Published in:Revista de saúde pública 2006-12, Vol.40 (6), p.1118-1123
Main Authors: Bona, Ana Caroline Dalla, Navarro-Silva, Mário A
Format: Article
Language:Portuguese
Subjects:
Animals
Anopheles - physiology
Brazil
Chi-Square Distribution
Dissection - methods
Female
Humidity
Insect Vectors - physiology
Ovary - physiology
Oviposition - physiology
Periodicity
Photoperiod
Population Density
Seasons
Temperature
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Summary:To determine the parity and ovarian development of Anopheles cruzii species during the seasons. Collections were carried out fortnightly in the morning in the Palmito State Park in the municipality of Paranaguá, Southern Brazil, between April 2004 and April 2005. Adult mosquitoes were captured using human landing rate. Dissections were performed using Detinova's and Polovodova's methods and follicular development was assessed following Christophers and Mer's criteria. A total of 208 specimens of Anopheles cruzii were dissected. Most females dissected were nulliparous in the seasons; 14.4% of them were found to be nulliparous above Christophers and Mer's stage II, which shows previous blood meal prior to the first oviposition. It was observed that Anopheles cruzii populations comprised young mosquitoes, probably due to high mortality among parous females. The likely gonotrophic discordance is epidemiologically relevant because female mosquitoes can search for more than one host to complete the maturation of their eggs.
ISSN:0034-8910
DOI:10.1590/S0034-89102006000700023