Effects of flooding and temperature on Aedes albifasciatus development time and larval density in two rain pools at Buenos Aires University City
Mem. Inst. Oswaldo Cruz
;
95(6): 787-93, Nov.-Dec. 2000. ilus, tab, graf
Article
in English
| LILACS
| ID: lil-273432
RESUMO
Aedes albifasciatus is a floodwater mosquito that breeds in temporary waters. This semi-domestic species, widely distributed in Argentina, is a competent vector of the western equine encephalitis. The present study was carried out in two rain pools of the city of Buenos Aires, from April 1998 through March 1999. Samples were taken twice a week during the cold season and daily during the warmer months, starting from October. Immature mosquitoes were collected with a dipper, being the number of dippers proportional to the flooded area. The estimated rainfall thresholds to initiate cohorts of Ae. albifasciatus were 16-17 mm in the fall-winter period, 25 mm in the spring, and 30 mm in the summer. The development time of the different cohorts and the mean air temperature of their respective periods were estimated in all seasons, ranging from six days (at 24o.C) to 32 days (at 13o.C). The equation that best expresses the relationship between development time and mean air temperature is dt =166,27.e-0,1435.T (R2=0,92). Significantly shorter development times were recorded for larvae of the first three stages as compared to the fourth larval stage and pupae
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Rain
/
Temperature
/
Water
/
Aedes
/
Insect Vectors
Limits:
Animals
Country/Region as subject:
South America
/
Argentina
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2000
Type:
Article
Affiliation country:
Argentina
Institution/Affiliation country:
Universidad de Buenos Aires/AR
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