Impact of Salivary Gland Hypertrophy Virus Infection on the Mating Success of Male Glossina pallidipes: Consequences for the Sterile Insect TechniqueReport as inadecuate




Impact of Salivary Gland Hypertrophy Virus Infection on the Mating Success of Male Glossina pallidipes: Consequences for the Sterile Insect Technique - Download this document for free, or read online. Document in PDF available to download.

Many species of tsetse flies are infected by a virus GpSGHV that causes salivary gland hypertrophy SGH. Female Glossina pallidipes Austen with SGH symptoms SGH+ have reduced fecundity and SGH+ male G. pallidipes are unable to inseminate female flies. Consequently, G. pallidipes laboratory colonies with a high prevalence of SGH have been difficult to maintain and have collapsed on several occasions. To assess the potential impact of the release of SGH+ sterile male G. pallidipes on the efficacy of an integrated control programme with a sterile insect technique SIT component, we examined the mating efficiency and behaviour of male G. pallidipes in field cages in relation to SGH prevalence. The results showed in a field cage setting a significantly reduced mating frequency of 19% for a male G. pallidipes population with a high prevalence of SGH 83% compared to 38% for a male population with a low prevalence of SGH 7%. Premating period and mating duration did not vary significantly with SGH status. A high percentage >80% of females that had mated with SGH+ males had empty spermathecae. The remating frequency of female G. pallidipes was very low irrespective of the SGH status of the males in the first mating. These results indicate that a high prevalence of SGH+ in G. pallidipes not only affects colony stability and performance but, in view of their reduced mating propensity and competitiveness, releasing SGH+ sterile male G. pallidipes will reduce the efficiency of a sterile male release programme.



Author: Gratian N. Mutika, Carmen Marin, Andrew G. Parker, Drion G. Boucias, Marc J. B. Vreysen, Adly M. M. Abd-Alla

Source: http://plos.srce.hr/



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