Dinámica poblacional de Aedes aegypti (Diptera: Culicidae) en Córdoba Capital.

DOMÍNGUEZ, MARTHA CECILIA; LUDUEÑA ALMEIDA, FRANCISCO FELIPE; ALMIRÓN, WALTER RICARDO

REVISTA DE LA SOCIEDAD ENTOMOLóGICA ARGENTINA

Año: 2000 vol. 59 p. 41 - 50

0373-5680

Seasonal fluctuations in population size of Ae. aegypti, and basic population parameters were estudied. Eggs were collected using ovitraps during spring, summer and autumn, however a continuous record was only kept from the last week of November up to the first week of April. Most eggs were collected between December and March, with an abundance peak in late December-early January. No eggs were found when temperature dropped under 17º C, which could be the species activity thermal threshold. The number of eggs collected each week was correlated with the mean temperature, and accumulate rainfall, relative humidity, and photoperiod recorded during that week, and also considering a one to four week delay, being only significant for a four-week delay period (r = 0.81; p < 0.05). Basic population parameters were estimated by means of cohorts of immature stages kept under natural conditions. No embryonic development was recorded under winter temperatures, while from spring through autumn the development time varied between 3.18 and 4.43 days. Larval and pupal development time varied between 8.91 and 20.81, and 2.90 and 6.85 days respectively, increasing as temperature dropped. Pre-adult stage development rate was significantly correlated with temperature (r = 0.97; p < 0.05). A development thermal threshold of 12.8º C was estimated. A 68.8% of hatching was recorded flooding eggs for the first time after winter, that is, eggs containing a fully formed embryo perfectly resist Córdoba’s low temperatures.