Contrasting Patterns of Within-Species Morphological Variation in Two Cactophilic Drosophila Species (Diptera: Drosophilidae)

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 antoniet...

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Bibliographic Details
Published in:Neotropical entomology 2013-08, Vol.42 (4), p.384-392
Main Authors: Mateus, R P, Moura, M O, Manfrin, M H, Monteiro, S G, Sene, F M
Format: Article
Language:English
Subjects:
aedeagus
Agriculture
Animals
Biomedical and Life Sciences
Brazil
Drosophila
Drosophila - anatomy & histology
Drosophila - classification
Entomology
host plants
intraspecific variation
Life Sciences
Morphology and Physiology
Systematics
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Summary: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.
ISSN:1519-566X
1678-8052
DOI:10.1007/s13744-013-0128-2