« Previous AbstractGas--particle partitioning of organic compounds and its interpretation using relative solubilities    Next AbstractIdentification of human skin microbiome odorants that manipulate mosquito landing behavior »

Parasit Vectors

Title:		Lutzomyia longipalpis s.l. in Brazil and the impact of the Sao Francisco River in the speciation of this sand fly vector
Author(s):		Coutinho-Abreu IV; Sonoda IV; Fonseca JA; Melo MA; Balbino VQ; Ramalho-Ortigao M;
Address:		"Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA. mortigao@nd.edu"
Journal Title:		Parasit Vectors
Year:		2008
Volume:		20080612
Issue:		1
Page Number:		16 -
DOI:		10.1186/1756-3305-1-16
ISSN/ISBN:		1756-3305 (Electronic) 1756-3305 (Linking)
Abstract:		"Lutzomyia longipalpis s.l. (Diptera: Psychodidae) is the principal vector of Leishmania infantum chagasi in the Americas, and constitutes a complex of species. Various studies have suggested an incipient speciation process based on behavioral isolation driven by the chemotype of male sexual pheromones. It is well known that natural barriers, such as mountains and rivers can directly influence population divergence in several organisms, including insects. In this work we investigated the potential role played by the Sao Francisco River in eastern Brazil in defining the current distribution of Lu. longipalpis s.l. Our studies were based on analyses of polymorphisms of the cytochrome b gene (cyt b) sequences from Lu. longipalpis s.l. available in public databases, and from additional field-caught individuals. Altogether, 9 distinct populations and 89 haplotypes were represented in the analyses. Lu. longipalpis s.l. populations were grouped according to their distribution in regards to the 10 degrees S parallel: north of 10 degrees S (<10 degrees S); and south of 10 degrees S (>10 degrees S). Our results suggest that although no polymorphisms were fixed, moderate genetic divergences were observed between the groups analyzed (i.e., FST = 0.184; and Nm = 2.22), and were mostly driven by genetic drift. The population divergence time estimated between the sand fly groups was about 0.45 million years (MY), coinciding with the time of the change in the course of the Sao Francisco River, during the Mindel glaciation. Overall, the polymorphisms on the cyt b haplotypes and the current speciation process detected in Lu. longipalpis s.l. with regards to the distribution of male sexual pheromones suggest a role of the Sao Francisco River as a significant geographical barrier in this process"
Keywords:
Notes:		"PubMed-not-MEDLINECoutinho-Abreu, Iliano V Sonoda, Ivan V Fonseca, Jose A Melo, Marcia A Balbino, Valdir Q Ramalho-Ortigao, Marcelo eng England 2008/06/14 Parasit Vectors. 2008 Jun 12; 1(1):16. doi: 10.1186/1756-3305-1-16"