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A Multi-detection Assay for Malaria Transmitting Mosquitoes
Published on: February 28, 2015
Geographic and ecologic distributions of the Anopheles gambiae complex predicted using a genetic algorithm
Rebecca S Levine1, A Townsend Peterson, Mark Q Benedict
1Division of Parasitic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30341-3717, USA. Rlevine@cdc.gov
The American Journal of Tropical Medicine and Hygiene
|March 3, 2004
Summary
Ecologic niche modeling reveals the potential distribution of malaria vectors Anopheles gambiae, A. arabiensis, and A. quadriannulatus in Africa. This study clarifies spatial discontinuities and identifies under-sampled regions, improving our understanding of vector distribution.
Area of Science:
- Medical entomology
- Ecology
- Biogeography
Background:
- The distribution of the Anopheles gambiae complex, crucial malaria vectors, is poorly understood across Africa due to extensive under-sampling.
- Accurate mapping of these vectors is essential for effective malaria control strategies.
Purpose of the Study:
- To predict the potential geographic distribution of three key Anopheles gambiae complex members: A. gambiae, A. arabiensis, and A. quadriannulatus.
- To statistically validate the predictive models and compare them with existing data.
- To retrospectively assess the likely origin of the Anopheles gambiae sensu lato introduction to Brazil in 1929.
Main Methods:
- Ecologic niche modeling was employed to predict species distributions based on environmental variables.
- Statistical significance of the developed models was rigorously assessed.
- Models were projected historically and geographically to South America to investigate past introductions.
Main Results:
- Model predictions align with previous distribution estimates but offer enhanced spatial detail, particularly for A. gambiae sensu stricto, showing discontinuities consistent with genetic data.
- Large areas in Africa were identified where A. arabiensis is predicted to occur but has been historically under-sampled.
- Retrospective analysis suggests that either A. gambiae sensu stricto or A. arabiensis could have been responsible for the 1929 introduction into Brazil.
Conclusions:
- Ecologic niche modeling provides a powerful tool for refining our understanding of Anopheles gambiae complex distribution in Africa.
- The study highlights significant knowledge gaps in vector distribution, particularly for A. arabiensis.
- This research offers valuable insights into historical vector introductions and informs future malaria control efforts.
