Fitness of Mass-Reared Males of Anastrepha obliqua (Diptera: Tephritidae) Resulting From Mating Competition Tests in Field Cages

Periodo de realización: 2017/06/01 al 2017/01/01

Tipo: Artículo científico

Lugar(es) de estudio: Metapa de Domínguez, Las Rosas, Tapachula de Córdova y Ordoñez, Chis., México
Resumen: "The sterile insect technique uses males that have been mass-reared in a controlled environment.The insects, once released in the eld, must compete to mate. However, the mass-rearing condition supposes a loss of tness that will be noticeable by wild females.To compare the tness of wild males and mass-reared males, three competition settings were established. In setting 1, wild males, mass-reared males and wild females were released in eld cages. In setting 2, wild females and wild males were released without competition, and in setting 3, mass-reared males and mass-reared females were also released without competition. Male tness was based on their mating success, fecundity, weight and longevity. The tness of the females was measured based on weight and several demographic parameters. The highest percentage of mating was between wild males and wild females between 0800 and 0900 h in the competition condition, while the mass-reared males started one hour later.The successful wild males weighed more and showed longer mating times, greater longevity and a higher number of matings than the mass-reared males. Although the mass-reared males showed the lowest percentage of matings, their fecundity when mating with wild females indicated a high tness. Since the survival and fecundity of wild females that mated with mass-reared males decreased to become similar to those of mass-reared females that mated with mass-reared males, females seem to be in uenced by the type of male (wild or mass-reared)."

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