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Showing papers on "Cestrum published in 1966"


Journal ArticleDOI
TL;DR: Analysis of larval samples collected directly in their natural breeding sites has demonstrated that the populations of D. flavopilosa are polymorphic for the gene arrangements in their chromosomes, and that the frequencies of certain heterokaryotypes vary according to the geographic regions.
Abstract: The flavopilosa group of species of Drosophila, subgenus Drosophila, was established for D. flavopilosa Frey and 13 other species from the Neotropical region (Wheeler et al., 1962). In Chile, the exclusive natural breeding and feeding sites of D. flavopilosa are the flowers of the solanaceous plant, Cestrum parqui L'Her. Recently, Dr. A. Hunter from the Los Andes University (Colombia) and the present author, found inside the flowers of another species of Cestrum (C. tomentosum Sandwith) near Bogota, larvae of two other species of the group (D. acroria and another form not yet determined). These observations suggest that the members of the group are mainly pollen feeders, and probably are associated with different species of Cestrun. Although up to now it has not been possible to breed D. flavopilosa under laboratory conditions, the analysis of larval samples collected directly in their natural breeding sites, has allowed the author to study the chromosomal structure of some Chilean populations of the fly (Brncic, 1962). These studies have demonstrated that the populations of D. flavopilosa are polymorphic for the gene arrangements in their chromosomes, and that the frequencies of certain heterokaryotypes vary according to the geographic regions. These studies have also shown that there is an altitudinal gradient in the distribution of some of these gene arrangements. Such an analysis was interesting for many reasons.

52 citations