Mateus R P, Moura M O, Manfrin M H, Monteiro S G, Sene F M
Depto de Ciências Biológicas, Univ Estadual do Centro-Oeste, Guarapuava, PR, Brasil.
Neotrop Entomol. 2013 Aug;42(4):384-92. doi: 10.1007/s13744-013-0128-2. Epub 2013 Apr 12.
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.
在这项研究中，我们调查了分布于巴西东南部的两种嗜仙人掌果蝇物种——古韦果蝇（Drosophila gouveai Tidon-Sklorz & Sene）和安东尼塔果蝇（Drosophila antonietae Tidon-Sklorz & Sene）自然种群标本的雄性交配器官（阳茎）的形态变异。考虑到它们的历史和生态特征，我们探究了这两个物种的种内变异性是如何分布的。我们的结果显示，这两个物种具有两种不同的阳茎形态，并且仅在古韦果蝇中观察到种内差异，因为标本可以根据其种群来源进行区分。相比之下，在对大小差异进行校正后，在安东尼塔果蝇中未检测到这一特征。种内变异的对比模式，以及这两个物种表现出的其他特征，很可能是由历史寄主植物关联与分布以及种群事件的差异所解释的，这些差异决定了这两种南美洲嗜仙人掌果蝇物种的进化历史。
