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Tsetse: the limits to population growth
1ODA Tsetse Research Project, Tsetse and Trypanosomiasis Control Branch, Causeway, Zimbabwe.
Medical and Veterinary Entomology
|July 1, 1988
Summary
Tsetse fly population growth is sensitive to adult death rates, with a 1% increase causing a tenfold change in growth rate. Eradicating tsetse populations requires a sustained 4% daily mortality, achievable with methods like odour-baited targets.
Area of Science:
- Entomology
- Population Dynamics
- Mathematical Biology
Background:
- Tsetse fly populations are critical vectors of trypanosomiasis.
- Understanding tsetse population dynamics is essential for disease control and eradication strategies.
Purpose of the Study:
- To estimate tsetse population growth rates using Leslie matrices.
- To investigate the impact of key demographic parameters on population growth.
- To develop a model for predicting tsetse population dynamics and resilience.
Main Methods:
- Calculated dominant eigenvalues of Leslie matrices to estimate growth rates.
- Varied pre-adult and adult survival, interlarval period, and pupal duration to assess their effects.
- Developed a linear model incorporating vital parameters and their interactions.
Main Results:
- Growth rate (R) showed approximate linear relationships with adult/pre-adult death rates and log fecundity/pupal duration.
- A 1% increase in adult death rate led to a tenfold change in R.
- Pupal duration's effect on growth rate varied with population growth status (positive, negative, or equilibrium).
Conclusions:
- Tsetse population growth is highly sensitive to adult mortality rates.
- Sustained daily mortality of 4% is sufficient for tsetse eradication, irrespective of density dependence.
- Odour-baited targets offer a viable, sustainable method for achieving eradication by imposing necessary mortality rates.