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Am. J. Trop. Med. Hyg., 69(5), 2003, pp. 484-493
Copyright © 2003 by The American Society of Tropical Medicine and Hygiene

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GENETIC RELATIONSHIPS AMONG SOME SPECIES GROUPS WITHIN THE GENUS LUTZOMYIA (DIPTERA: PSYCHODIDAE)

DARA G. TORGERSON, MARGARITA LAMPO, YELITZA VELÁZQUEZ, AND PATRICK T. K. WOO
Centro de Ecología, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela; Department of Biology, McMaster University, Hamilton, Ontario, Canada; Department of Zoology, University of Guelph, Guelph, Ontario, Cannada

Molecular data on Lutzomyia are very scarce, despite the fact that this genus includes all the species involved in the transmission of leishmaniasis in America. We examine the genetic relationships among eight morphologic groups within the Lutzomyia genus and two Brumptomyia species, using nine enzyme loci and the last 285 basepairs of the mitochondrial cytochrome b gene. The structure of the genetic variation among the species analyzed indicated a closer genetic relationship among members of a morphologic group than between members of different groups. The lower levels of variation recorded among these groups compared with that between Brumptomyia and Lutzomyia suggest a subgeneric status for all of these groups, including Psychodopygus. A maximum likelihood tree for the allozyme data and a neighbor-joining consensus tree for the mitochondrial DNA sequences showed a general agreement with morphologic groups, with only minor differences. Nyssomyia, Verrucarum and Micropygomyia formed separate monophyletic groups. Lutzomyia could not be separated from Psathyromyia, and both Migonei species, L. dubitans and L. migonei, grouped in different clades according to the host species they are found on.

Received February 13, 2003. Accepted for publication June 18, 2003.

Acknowledgments: We are grateful to Roy Danzmann for help with DNA sequencing and analysis, Milagros Rinaldi and Carmen Zulay Garcia for technical assistance, and Maria Dora Feliciangeli for assisting with the species identification. We also thank Luis Miguel Márquez and two anonymous reviewers for valuable comments on the manuscript.

Financial support: This study was supported by Consejo Nacional de Investigacions Cientificas y Tecnologicas (CONICIT) (No. 96–0001370), the World Health Organization-World Bank (No. 021–007), the Canadian International Development Agency (CIDA), and the Canadian Bureau for International Education (CBIE).

Authors’ addresses: Dara G. Torgerson, Department of Biology, Mc-Master University, 1280 Main Street West, Hamilton, Ontario, Canada, L8S 4K1, Telephone: 905-525-9140, Fax: 905-522-6066, E-mail: torgerdg{at}mcmaster.ca. Margarita Lampo and Yelitza Velázquez, Centro de Ecologia, Instituto Venezolano de Investigaciones Cientificas, Apartado 21827, Caracas 1020-A, Venezuela, Patrick T. K. Woo, Department of Zoology, University of Guelph, Guelph, Ontario, Canada, N1G 2W1.






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Copyright © 2003 by the American Society of Tropical Medicine and Hygiene.