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Activity patterns in Glossina longipennis: a field study using different sampling methods

J N Makumi1, C Green, M Baylis

  • 1Kenya Trypanosomiasis Research Institute, Kikuyu, Kenya. chg@geendev.u-net.com

Medical and Veterinary Entomology
|November 24, 1998
PubMed
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Glossina longipennis, a tsetse fly, exhibits crepuscular activity, with peak activity at dawn and dusk. Mobile baits captured more males, which had higher nutritional reserves than females.

Area of Science:

  • Veterinary Entomology
  • Insect Ecology
  • African Trypanosomiasis Vector Research

Background:

  • Glossina longipennis is a significant vector of African trypanosomiasis.
  • Understanding the daily activity patterns of tsetse flies is crucial for effective vector control strategies.

Purpose of the Study:

  • To investigate the daily activity patterns of Glossina longipennis at Galana Ranch.
  • To compare the effectiveness of different sampling methods (stationary vs. mobile baits) in capturing Glossina longipennis.
  • To analyze the demographic and physiological differences between sexes and among flies captured by different methods.

Main Methods:

  • Daily activity of Glossina longipennis was monitored using black odour-baited electrocuting targets.
  • Stationary sampling methods included traps and a stationary ox.

Related Experiment Videos

  • Mobile baits were also employed to assess fly activity throughout the day.

    • Main Results:

    • Glossina longipennis displayed a crepuscular activity pattern, with peaks at dawn (06:00-06:30) and dusk (18:30-19:00).
    • Females constituted 60% of the total catch, with males being more prevalent in mobile bait catches.
    • Mobile baits captured more males with higher fat and haematin reserves, and fewer older females and younger males compared to stationary baits.

    Conclusions:

    • The crepuscular activity of Glossina longipennis is confirmed, with distinct morning and evening activity periods.
    • Mobile baits are more effective in capturing males, potentially those with higher nutritional status, and may bias age-related sampling.
    • Findings highlight the importance of considering sampling methodology when assessing tsetse fly populations and their characteristics.