Detection of activity cycles of tsetse from capture–recapture data |
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Authors: | DAVID J ROGERS SARAH E RANDOLPH |
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Institution: | Department of Zoology, University of Oxford |
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Abstract: | ABSTRACT. - 1 Activity cycles of female tsetse (Glossina palpalis palpalis Robineau-Desvoidy) in the field are contrasted with those of males, using mark-release-recapture data from continuous biconical trap samples over a period of 80 days in two villages in Ivory Coast.
- 2 Variability in recapture rates was examined using the techniques of autocorrelation and spectral analysis. In order to do this a two-dimensional diffusion model incorporating both mortality and emigration was first fitted to corrected recapture rate data to produce a trend line, deviations from which were subjected to the analysis.
- 3 The autocorrelations for the data for males suggest considerable variability in activity, presumably associated with feeding, around a mean period of about 4 days in one village and seven in the other.
- 4 Data for females show a strong regular periodicity of about 9–10 days, reflecting the pregnancy cycle, and shorter, more variable periodicities probably corresponding to feeding.
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Keywords: | Tsetse feeding pregnancy cycles capture-recapture spectral analysis |
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