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      Fluctuación estacional de Aedes aegypti en Chaco, Argentina Translated title: Seasonal fluctuation of Aedes aegypti in Chaco Province, Argentina

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          Abstract

          OBJETIVO: Estudiar la fluctuación estacional de Aedes aegypti y correlacionar su abundancia con factores ambientales. MÉTODOS: Las colectas fueron realizadas entre octubre de 2002 y noviembre de 2003, en la ciudad de Resistencia, província del Chaco, Argentina. Fueron hechos muestreos semanales empleando ovitrampas. El número de huevos colectados fue correlacionado con la temperatura, humedad relativa ambiente, evaporación y precipitaciones registradas en dicha localidad. Se utilizó el test de correlación de Pearson con los respectivos datos climáticos semanales, realizándose correlaciones simples y múltiples. RESULTADOS: La ocurrencia de huevos fue registrada de manera discontinua, desde la última semana de octubre de 2002, hasta la última de junio de 2003, a partir de la cual no fueron encontrados hasta noviembre de 2003. Se observó un pico de abundancia (70%) en noviembre y diciembre, que coincidió con el período de temperaturas altas y mayores precipitaciones. Otro pico, aunque de menor importancia, fue observado en abril y coincidió con las lluvias de otoño. Las correlaciones fueron significativas solamente para las precipitaciones acumuladas mensuales (r=0,57; P<0,05). No se registraron oviposturas en invierno cuando la temperatura media semanal fue inferior a 16,5ºC. CONCLUSIONES: Los resultados muestran correlación entre la oviposición y las precipitaciones, pues los períodos de mayor actividad de Aedes aegypti ocurrieron en el final de la primavera, comienzos del verano y en el inicio del otoño. Estos serían los períodos de mayor riesgo epidemiológico especialmente ante la aparición de personas infectadas.

          Translated abstract

          OBJECTIVE: To study the seasonal fluctuation of Aedes aegypti and to correlate its abundance with climate conditions. METHODS: Samples were weekly collected in ovitraps in the city of Resistencia, Chaco Province, Argentina, between October 2002 and November 2003. The number of eggs collected was correlated with temperature, relative humidity, evaporation and rainfalls recorded. Pearson's correlation test with the respective weekly climate data was used in single and multiple correlation analyses. RESULTS: The first record of eggs took place in the last week of October 2002 and continued irregularly up to the last week of June 2003, when no more eggs were seen until November 2003. The highest peak of abundance (70%) was observed in November-December 2002, which coincided with the season of high temperatures and rainfalls. A second less important peak was seen in April coinciding with autumn rainfalls. Significant correlations were found only for monthly accumulated rainfall (r=0.57; p<0.05). No ovipositions were recorded during the winter when temperature dropped below 16.5ºC. CONCLUSIONS: The results show a correlation between oviposition and rainfall, as the periods of high activity of Aedes aegypti were in the end of spring-beginning of summer, and beginning of fall. These are periods of major epidemiological risk if an infected person gets to Resistencia.

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          Dengue y dengue hemorrágico en las Américas: guías para su prevención y control

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            Mosquito ecology: field sampling methods

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              Oviposition activity and seasonal pattern of a population of Aedes (Stegomyia) aegypti (L.) (Diptera: Culicidae) in subtropical Argentina

              Monthly oviposition activity and the seasonal density pattern of Aedes aegypti were studied using larvitraps and ovitraps during a research carried out by the Public Health Ministry of Salta Province, in Tartagal, Aguaray and Salvador Mazza cities, in subtropical Argentina. The A. aegypti population was active in both dry and wet seasons with a peak in March, accordant with the heaviest rainfall. From May to November, the immature population level remained low, but increased in December. Ae. aegypti oviposition activity increased during the fall and summer, when the relative humidity was 60% or higher. Eggs were found in large numbers of ovitraps during all seasons but few eggs were observed in each one during winter. The occurrence and the number of eggs laid were variable when both seasons and cities were compared. The reduction of the population during the winter months was related to the low in the relative humidity of the atmosphere. Significant differences were detected between oviposition occurrences in Tartagal and Aguaray and Salvador Mazza cities, but no differences in the number of eggs were observed. Two factors characterize the seasonal distribution pattern of Ae. aegypti in subtropical Argentina, the absence of a break during winter and an oviposition activity concomitant of the high relative humidity of the atmosphere.
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                Author and article information

                Journal
                rsp
                Revista de Saúde Pública
                Rev. Saúde Pública
                Faculdade de Saúde Pública da Universidade de São Paulo (São Paulo, SP, Brazil )
                0034-8910
                1518-8787
                August 2005
                : 39
                : 4
                : 559-564
                Affiliations
                [01] Chaco orgnameUniversidad Nacional del Nordeste orgdiv1Instituto de Medicina Regional Argentina
                [02] Córdoba orgnameUniversidad Nacional de Córdoba orgdiv1Facultad de Ciencias Exactas, Físicas y Naturales orgdiv2Centro de Investigaciones Entomológicas de Córdoba Argentina
                Article
                S0034-89102005000400007 S0034-8910(05)03900407
                10.1590/S0034-89102005000400007
                408fe90e-4ad5-425c-8612-56c9be31ba84

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 18 April 2005
                : 03 April 2004
                : 01 February 2005
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 13, Pages: 6
                Product

                SciELO Public Health

                Self URI: Texto completo solamente en formato PDF (ES)

                Climatic changes,Oviposition,Aedes,Seasonal variations,Oviposición,Variaciones estacionales,Cambios climáticos

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