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Morphometric variations of two populations of Anopheles albitarsis F (Diptera: Culicidae) in the Orinoquia region, Colombia
Variaciones morfométricas de poblaciones de Anopheles albitarsis F (Diptera: Culicidae) en la Orinoquía colombiana
Palabras clave:
Anopheles, Body Size, Malaria (en)Anopheles, Tamaño corporal, Malaria (es)
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Introduction: Anopheles albitarsis F has been reported with natural infection by Plasmodium falciparum. In the Orinoquía, this species is in sympatry with Anopheles darlingi, a major malaria vector.
Objective: To determine morphometric variations in diagnostic characters of wings and hind legs in adult mosquitoes of two populations of the Orinoquia region, where malaria is a major public health issue.
Materials and methods: Using linear and geometric morphometry approaches, wing patterns of Costa veins from wild females, females obtained from entomological series and isofamilies were analyzed. Shape and wing size were estimated. The second hindtarsomere was analyzed by means of linear morphometry.
Results: Two patterns of spots on the Costa vein of the wings were observed. Significant statistical differences (p<0.05) were found in wing size and shape between wild females and females obtained under laboratory conditions. In the populations studied, a PHD/HP ratio of 1.17-1.19 in the Costa vein and a 0.38-0.54 for the DSIII2/TaIII2 ratio in the second posterior tarsomere of the hind legs, proposed as diagnostic characters.
Conclusion. The studied populations of An. albitarsis F showed significant differences between wild females and those obtained under laboratory conditions, not only in wing size, but also in shape. New ranges presented for the diagnostic characters of the species.
Introducción. Anopheles albitarsis F ha sido registrada con infección natural por Plasmodium falciparum. En la Orinoquía, se encuentra en simpatría con Anopheles darlingi, un vector primario de malaria.
Objetivo. Determinar variaciones morfométricas en caracteres diagnósticos de ala y pata posterior de mosquitos adultos procedentes de dos poblaciones naturales de la Orinoquía, donde la malaria constituye un problema de salud pública.
Materiales y métodos. Se analizaron, mediante morfometría lineal y geométrica, los patrones de manchas de la vena Costa del ala de hembras silvestres, de hembras obtenidas de series entomológicas y de isofamilias. Se estimó la forma y el tamaño alar. El segundo tarsómero posterior se analizó por morfometría lineal.
Resultados. Se observaron dos patrones de manchas de la vena Costa; se encontraron diferencias estadísticamente significativas en el tamaño y forma alar (p<0.05) entre las hembras silvestres y las obtenidas en condiciones de laboratorio. Para las poblaciones estudiadas, se proponen como caracteres diagnósticos la proporción PHD/HP de 1.17-1.19 en la vena Costa y 0.38-0.54 para la proporción DSIII2/TaIII2 del segundo tarsómero posterior de la pata posterior.
Conclusión. Las poblaciones estudiadas de An. albitarsis F presentaron diferencias significativas entre las hembras silvestres y las obtenidas en condiciones de laboratorio, no solo en el tamaño de las alas, sino también en la forma. Se presentan nuevos rangos para los caracteres diagnósticos de la especie.
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