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Wing length and host location in tsetse (Glossina spp.): implications for control using stationary baits

Research output: Contribution to journalArticle

Original languageEnglish
Article number24
Number of pages13
JournalParasites and Vectors
Volume12
Issue number24
Early online date11 Jan 2019
DOIs
DateAccepted/In press - 19 Dec 2018
DateE-pub ahead of print - 11 Jan 2019
DatePublished (current) - 11 Jan 2019

Abstract

Background
It has been suggested that attempts to eradicate populations of tsetse (Glossina spp.) using stationary targets might fail because smaller, less mobile individuals are unlikely to be killed by the targets. If true, tsetse caught in stationary traps should be larger than those from mobile baits, which require less mobility on the part of the flies.
Results
Sampling tsetse in the Zambezi Valley of Zimbabwe, we found that the number of tsetse caught from stationary traps, as a percent of total numbers from traps plus a mobile vehicle, was ~5% for male G. morsitans morsitans (mean wing length 5.830 mm; 95% CI: 5.800–5.859 mm) and ~10% for females (6.334 mm; 95% CI: 6.329–6.338 mm); for G. pallidipes the figures were ~50% for males (6.830 mm; 95% CI: 6.821–6.838 mm) and ~75% for females (7.303 mm, 95% CI: 7.302–7.305 mm). As expected, flies of the smaller species (and the smaller sex) were less likely to be captured using stationary, rather than mobile sampling devices. For flies of a given sex and species the situation was more complex. Multivariable analysis showed that, for females of both species, wing lengths changed with ovarian age and the month, year and method of capture. For G. pallidipes, there were statistically significant interactions between ovarian age and capture month, year and method. For G. m. morsitans, there was only a significant interaction between ovarian age and capture month. The effect of capture method was, however, small in absolute terms: for G. pallidipes and G. m. morsitans flies caught on the mobile vehicle had wings only 0.24 and 0.48% shorter, respectively, than flies caught in stationary traps. In summary, wing length in field samples of tsetse varies with ovarian age, capture month and year and, weakly, with capture method. Suggestions that a target-based operation against G. f. fuscipes in Kenya caused a shift towards a smaller, less mobile population of tsetse, unavailable to the targets, failed to account for factors other than capture method.
Conclusions
The results are consistent with the successful use of targets to eradicate populations of tsetse in Zimbabwe. Until further, more nuanced, studies are conducted, it is premature to conclude that targets alone could not, similarly, be used to eradicate G. f. fuscipes populations in Kenya.

    Research areas

  • Animals, Body Size, Feeding Behavior, Female, Flight, Animal/physiology, Insect Control/methods, Male, Species Specificity, Tsetse Flies/anatomy & histology, Wings, Animal/anatomy & histology

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via BMC at DOI: 10.1186/s13071-018-3274-x. Please refer to any applicable terms of use of the publisher.

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    Licence: CC BY

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