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INFLUENCE OF BREEDING SITES FEATURES ON GENETIC DIFFERENTIATION OF AEDES AEGYPTI POPULATIONS ANALYZED ON A LOCAL SCALE IN PHNOM PENH MUNICIPALITY OF CAMBODIA

This study analyzed genetic differentiation of 20 Aedes aegypti populations collected along a street in Phnom Penh Municipality of Cambodia. Using allozyme and microsatellite variations, we demonstrated that populations were differentiated and the pattern of differentiation was dependent on the type of breeding sites. Moreover, insecticide treatments with temephos mostly affect the population functioning of discarded containers. Low gene flow detected could limit the natural diffusion of resistant populations that might instead take advantage of human displacements to spread.

Received September 18, 2003. Accepted for publication October 30, 2003.

Acknowledgments: We are grateful to the "Fondation de France, Jeunesse Internationale" for providing a six-month fellowship to Christophe Paupy during his training at the Pasteur Institute in Cambodia. We thank Nadia Ayad, Laurence Mousson, Regine Villeret, and Marie Vazeille for technical assistance. We also thank the staff of the Unité de Virologie, Institut Pasteur du Cambodge), the National Malaria Center, and the municipality of Phnom Penh for their invaluable help in mosquito collections. We are indebted to Professor Jean-Luc Durosoir (Pasteur Institute, Paris, France), Professor Yves Buisson (Pasteur Institute, Phnom Penh, Cambodia), and Eliane Chungue (Pasteur Institute, Noumea, New Caledonia) for their constant support.

Financial support: This research was supported by the program ACIP "Action Concertée des Instituts Pasteur" (no. 41204).

Authors’ addresses: Christophe Paupy, Laboratoire de Microbiologie et Environnement, Institut Pasteur de La Nouvelle Calédonie, BP 61, 98845 Noumea, New Caledonia. Ngan Chantha, National Malaria Center, 372 Boulevard Monivong, Phnom Penh, Cambodia. Karine Huber, Nicolas Lecoz, and Anna-Bella Failloux, Unité Insectes et Maladies Infectieuses, Institut Pasteur, 25-28 Rue du Dr. Roux, 75724 Paris Cedex 15, France, Telephone: 33-1-40-61-36-17, Fax: 33-1-40-61-30-89, E-mail: afaillou{at}pasteur.fr. Jean-Marc Reynes, Unité de Virologie, Institut Pasteur du Cambodge, 5 Boulevard Monivong, Phnom Penh, Cambodia. Francois Rodhain, Ecole Pasteurienne d’Infectiologie, Institut Pasteur, 25-28 Rue du Dr. Roux, 75724 Paris Cedex 15, France.

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