Distribution of Anopheles gambiae along the Gambia River
Author Information
Author(s): Caputo Beniamino, Nwakanma Davis, Jawara Musa, Adiamoh Majidah, Dia Ibrahima, Konate Lassana, Petrarca Vincenzo, Conway David J, della Torre Alessandra
Primary Institution: Istituto Pasteur-Fondazione Cenci-Bolognetti, Università 'La Sapienza', Rome, Italy
Hypothesis
The geographic and temporal distribution of M and S molecular forms of Anopheles gambiae s.s. has not been investigated in detail.
Conclusion
The study supports a bionomic divergence between the M and S-forms and suggests higher-than-expected hybridization between the two forms in the western extreme of their distribution.
Supporting Evidence
- Over 4,000 An. gambiae s.l. adult females were collected and identified.
- M-form was mainly found in areas with water-retaining alluvial deposits.
- S-form prevailed in rural savannah areas of Eastern Senegal.
- Hybrids between M and S-forms were found at frequencies ranging from 0.6% to 7%.
- Anopheles melas and An. arabiensis frequencies were generally lower in rainy season samples.
Takeaway
Scientists studied mosquitoes along the Gambia River and found that two types of malaria-carrying mosquitoes live in different areas, with some mixing together more than expected.
Methodology
Indoor-resting An. gambiae s.l. females were collected along a 400 km transect and identified by PCR-RFLP.
Potential Biases
Potential underestimation of An. melas and An. arabiensis due to their behavior.
Limitations
The study may be biased by the collection method, which focused on indoor-resting mosquitoes.
Participant Demographics
The study involved collections from various ecological zones along the Gambia River.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% CI
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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