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IDIDAS : References: Spatial patterns of sterile Mediterranean fruit fly dispersal.

Title

Spatial patterns of sterile Mediterranean fruit fly dispersal.

Year

2012

Source

Entomologia Experimentalis et Applicata 142: 17–26

Abstract

The success of the sterile insect technique (SIT) for the control of the Mediterranean fruit fly ormedfly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), depends largely on the ability of sterile flies to spread in the target area and compete with the wild males for wild females. Our objectives in the present study were three-fold: (1) to evaluate the dispersal ability of sterile male medflies and compare their spatial dispersion patterns with that of wildmales, (2) to evaluate how different release methods affect subsequent spatial dispersal, and (3) to determine whether manipulating the prerelease diet of sterile males affects their dispersal. To achieve these objectives, we conducted three experiments in the field where we quantified and analyzed the spatial and temporal dispersal patterns of sterilemedflies and the dispersion of resident wild males. Overall, ca. 5% of the released sterile flies were recaptured 100 m from the release point, and ca. 2% were recaptured 200 m from the release point. The released flies rarely survived longer than 5–7 days. We repeatedly found that the spatial dispersion patterns of sterile males significantly correlated with those of wild males. Release methods strongly affected subsequent fly dispersal in the field as significantly more flies were recaptured following a scattered release vs. a central one. Finally, we show that enriching sterile fly pre-release diet with protein did not affect subsequent dispersal in the field.We conclude that sterile males are able to match the dispersion patterns of wild males, an outcome that is highly important for SIT success. Large releases from central points distant from each other may leave many areas uncovered. Accordingly, scattered releases, repeated twice a week, will provide better coverage of all available aggregations sites. The spatial performance of protein-fed males suggests that pre-release diet amendments may be used without detriment as a sexual stimulant in SIT programs.

Authors

Gavriel Sagi, Gazit Yoav, Leach Adrian, Mumford John & Yuval1 Boaz.

Keywords

Ceratitis capitata, sterile insect technique, dispersion, mark–release–recapture, nutritional ecology, Diptera, Tephritidae, medfly, SIT

Attachments

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Created at 17/06/2013 15:57 by NAIR, Deepu
Last modified at 17/06/2013 15:57 by NAIR, Deepu