Allozymatic divergence between border populations of two cryptic species of the Drosophila buzzatii cluster species (Diptera: Drosophilidae)

Author(s)

Mateus, Rogrio R. ^[1] ; Machado, Luciana P. B. ^[1] ; Moraes, Evandro M. ^[2] ; Sene, Fabio M. ^{[3, 4]}

Affiliation

^[1] Univ Estadual Centro Oeste, UNICENTRO, Lab Genet & Evolucao, Dept Ciencias Biol, BR-85040080 Guarapuava, PR - Brazil

^[2] Univ Fed Sao Carlos, Dept Ciencias Biol, BR-18052780 Sorocaba, SP - Brazil

^[3] Univ Sao Paulo, FMRP, Dept Genet, BR-14049900 Ribeirao Preto, SP - Brazil

^[4] Univ Sao Paulo, FFCL Ribeirao Preto, Dept Biol, BR-14049900 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Biochemical Systematics and Ecology; v. 38, n. 3, p. 410-415, JUN 2010.
• Web of Science Citations: 3

Abstract

Drosophila antonietae and Drosophila gouveai are allopatric, cactophilic, cryptic and endemic of South America species, which aedeagus morphology is considered the main diagnostic character. In this work, single close populations from the edge distributions of each species, located in an ``introgressive corridor{''}, were analyzed regarding temporal isozenzymatic genetic variability. Isocitrate dehydrogenase (Idh) appeared as a diagnostic locus between D. antonieate and D. gouveai because each population was fixed for different alleles. Moreover, several polymorphic loci showed accentuated divergence in the allele frequency, as evidenced by Nei's l(0.3188) and D (1.1432), and also by Reynolds' genetic distance and identity (1.3207 and 0.7331, respectively). Our results showed that, in spite of the very similar external morphology, related evolutionary histories, close distributions, and events of introgression in the studied area, these cryptic species have high allozymatic differentiation, and this is discussed here. (C) 2010 Elsevier Ltd. All rights reserved. (AU)