Intermittent releases: a modelling approach for sterile insect technique in mosquito control

Area of Science:

• Ecology
• Mathematical Biology
• Pest Management

Background:

• The Sterile Insect Technique (SIT) is an environmentally friendly method for mosquito control.
• Effective SIT implementation requires strategic planning of sterile male mosquito releases.
• Continuous release strategies may not be optimal for managing wild-type mosquito populations.

Purpose of the Study:

• To examine a stage-structured model for mosquito populations using intermittent Sterile Insect Technique (SIT).
• To investigate a density-dependent threshold for releasing sterile male mosquitoes.
• To optimize SIT by aligning sterile mosquito releases with wild-type and sterile mosquito population densities.

Main Methods:

• A stage-structured mathematical model was developed for mosquito population dynamics.
• Filippov's modelling approach was employed to analyze intermittent releases using piecewise-smooth functions.
• Filippov's convex method and differential inclusions were used to analyze system dynamics and bifurcations.

Main Results:

• The study identified the minimum sterile mosquito release rate required for effective population suppression.
• Intermittent releases were found to be a more effective alternative to continuous release strategies.
• Factors influencing the required release rate include wild-type mosquito immigration and sterile mosquito fitness.

Conclusions:

• Intermittent SIT, guided by a density-dependent threshold, offers a promising strategy for sustainable mosquito management.
• The model provides insights into optimizing sterile mosquito release rates for enhanced control.
• Accurate mosquito surveillance and consideration of biological factors are crucial for successful SIT implementation.