Demography of a genetic sexing strain of Anastrepha ludens (Diptera: Tephritidae): effects of selection based on mating performance :
Periodo de realización: 2018/06/01 al 2018/01/01
Tipo: Artículo científico
Lugar(es) de estudio: Metapa de Domínguez, Chis., México, San Cristóbal de las Casas, Chis., México, Tapachula, Chis., México
Resumen: "Tapachula-7 is a genetic sexing strain of Anastrepha ludens (Loew) (Diptera:
Tephritidae) developed for the application of the sterile insect technique (SIT). To
improve the sexual performance of this strain, a mass-reared colony was established
from males selected for their sexual competitiveness.
Males from selected colonies are more sexually competitive than nonselected males.
The present study aimed to analyse the demographic changes recorded in the study
colony throughout four consecutive generations, comparing this colony with the
parental colony and a wild strain.
The results obtained showed that, in the selected strain, fecundity increased, whereas
survival diminished, compared with the laboratory parental strain. The increases in
fecundity rates were observed at the first generation after selection. No changes were
observed in the duration of the reproductive period in the selected strain.
Compared with wild flies, selected flies had lower life expectancy, earlier and shorter
reproductive period, and greater daily fecundity at young ages (10–30 days), although
with lower lifetime fecundity rates.
The four generations of the selected colony showed similar patterns of survival and
reproduction. The better mating performance and the increase in early fecundity suggest
that selection could contribute to improve rearing efficiency and SIT effectiveness.