Respuesta de Philornis downsi Dodge & Aitken, 1968 (Diptera, Muscidae) frente a olores emitidos con fines reproductivos por individuos recién eclosionados
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2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
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En el laboratorio de la Unidad Entomológica de la Fundación Charles Darwin se realizan estudios para obtener información sobre la biología y ecología de la mosca parásita de aves Philornis downsi. En este estudio evaluamos la atracción de olores de dos tratamientos: pupas cerradas y pupas recién abiertas frente a machos del campo mediante el método del olfatómetro. Se obtuvieron reacciones positivas de parte de los machos frente a las pupas recién abiertas y ausencia de reacción frente a las pupas cerradas. Para determinar si el olor de las pupas recién abiertas estimula a los machos a la reproducción, se colocaron cinco pupas próximas a abrirse, al eclosionar los individuos machos fueron retirados, las hembras se mantuvieron encerradas con un macho mayor a cinco días de vida en un período de dos días, obteniendo resultados negativos ya que no se evidenció líquido seminal en las espermatecas de las hembras jóvenes. Se cree que la dieta inadecuada, la falta de espacio, la ausencia de luz solar y factores externos influyen en la falta de cópula. Se realizaron observaciones in situ por medio de filmaciones, las cuales lograron determinar la presencia de 13 comportamientos relacionadas con la reproducción, entre ellos un reporte de observación de cópula en el campo.
The entomologic division of Charles Darwin Foundation performs studies to record information regarding the biology and ecology of the fly Philornis downsi, a bird’s parasite. In this study, we analyzed the attraction response of wild males using an olfatomether, in two treatments: males exposed to the smell of unhatched pupae and of recently hatched pupae. We recorded male’s positive reaction to recently hatched pupae, and no response to unhatched pupae. To determine whether the smell from recently hatched pupae trigger reproductive behaviors in males, we enclosured a male, older than five days, with five pupae close to hatched. After hatching, new male individuals were removed while females were kept together with the older male for two more days. There were negative results as there was no evidence of seminal fluid in the females’ spermatic sac. Based on the results here found, it is conceived that the inadequate feeding regime, the restricted space, the lack of sunlight and external factors explain the lack of mating. In situ observations were also performed and recorded. There were 13 behaviors associated to reproduction, and also we described one event of mating.
The entomologic division of Charles Darwin Foundation performs studies to record information regarding the biology and ecology of the fly Philornis downsi, a bird’s parasite. In this study, we analyzed the attraction response of wild males using an olfatomether, in two treatments: males exposed to the smell of unhatched pupae and of recently hatched pupae. We recorded male’s positive reaction to recently hatched pupae, and no response to unhatched pupae. To determine whether the smell from recently hatched pupae trigger reproductive behaviors in males, we enclosured a male, older than five days, with five pupae close to hatched. After hatching, new male individuals were removed while females were kept together with the older male for two more days. There were negative results as there was no evidence of seminal fluid in the females’ spermatic sac. Based on the results here found, it is conceived that the inadequate feeding regime, the restricted space, the lack of sunlight and external factors explain the lack of mating. In situ observations were also performed and recorded. There were 13 behaviors associated to reproduction, and also we described one event of mating.
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PHILORNIS DOWNSI, CÓPULA, OLORES, OLFATÓMETRO, PUPAS