The evolutionary history of Drosophila buzzatii. XXXIII. Are Opuntia hosts a selective factor for the inversion polymorphism?

Heredity
J J FanaraA Fontdevila

Abstract

Previous work has shown fitness differences among chromosomal arrangements by means of selection component analysis in two Drosophila buzzatii natural populations, one of which is native to Argentina and the other a colonized population from Carboneras, Spain. Founder effects or niche shifts were proposed to explain the differences observed in the pattern of pleiotropic effects of inversions on fitness components. In this paper, we address the possible role of niche shifts by determining whether differential attraction to, oviposition on, or utilization of the rotting cladodes of two different Opuntia species (O. quimilo and O. ficus-indica) occurred among individuals carrying different second chromosome karyotypes in a natural Argentinian population. Through the analysis of more than 2500 individuals comprising five different life cycle stages associated with the necroses of these two cactus species, we found that the distributions of inversion frequencies in samples of adult flies, third instar larvae and emerging adults collected on both Opuntia species were not significantly different. Likewise, no evidence of differential oviposition was observed. These findings suggest that niche shifts cannot, solely, account for the cha...Continue Reading

References

Jan 1, 1988·Australian Journal of Biological Sciences·W R Knibb, J S Barker
Jun 1, 1994·Evolution; International Journal of Organic Evolution·Mauro Santos
Jun 1, 1994·Evolution; International Journal of Organic Evolution·Antonio BarbadillaAntonio Fontdevila

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Citations

Sep 27, 2000·Evolution; International Journal of Organic Evolution·P Fernández Iriarte, E Hasson
Apr 1, 1999·Evolution; International Journal of Organic Evolution·Constantina RodriguezEsteban Hasson

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