Abstract
In this work, we investigated the morphological variation of the intromittent male copulatory organ (aedeagus) of specimens from natural populations of two cactophilic Drosophila species distributed in the southeast region of Brazil, Drosophila gouveai Tidon-Sklorz & Sene and Drosophila antonietae Tidon-Sklorz & Sene. It was explored how the within-species variability is arranged for both species, considering their historical and ecological features. Our results showed two distinct aedeagal morphologies for these species, and differences within species were observed only in D. gouveai as specimens could be distinguished by their population origin. In contrast, after size discrepancies correction, this feature was not detected in D. antonietae. The contrasting patterns of intraspecific variation, together with the other features exhibited by these two species, are most likely to be explained by differences in the historical host plant association and distribution and in demographic events, which determined the evolutionary history of these two South American cactophilic Drosophila species.
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Acknowledgements
We would like to thank the three anonymous referees for the valid and useful suggestions. This research was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Universidade de São Paulo (USP).
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Edited by Roberto A Zucchi – ESALQ/USP
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Mateus, R.P., Moura, M.O., Manfrin, M.H. et al. Contrasting Patterns of Within-Species Morphological Variation in Two Cactophilic Drosophila Species (Diptera: Drosophilidae). Neotrop Entomol 42, 384–392 (2013). https://doi.org/10.1007/s13744-013-0128-2
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DOI: https://doi.org/10.1007/s13744-013-0128-2