Franco Fernando F, Soto Ignacio M, Sene Fabio M, Manfrin Maura H
Depto. Genética, Faculdade de Medicina de Ribeirão Preto, Univ. São Paulo, Ribeirão Preto, SP, Brazil, 14049-900.
Neotrop Entomol. 2008 Sep-Oct;37(5):558-63. doi: 10.1590/s1519-566x2008000500009.
Drosophila serido Vilela & Sene is a polytypic and cactophilic species with broad geographic distribution in Brazil. The morphology of the aedeagi of eight natural populations of D. serido was analyzed. Based on features of their aedeagi, populations of D. serido were discriminated with an efficiency of nearly 75%. The analysis using the Mantel test suggests that the morphological divergence of D. serido is correlated with the geographic distance among populations. There is no single cause to explain the observed pattern; therefore, the results were discussed considering the three main hypotheses to explain the aedeagus evolution: lock and key, pleiotropy and sexual selection. Alternatively, the aedeagus variability of D. serido might be related to environmental causes, such as temperature and/or host cacti.
果蝇Serido Vilela & Sene是一种多型且嗜仙人掌的物种，在巴西具有广泛的地理分布。对果蝇Serido八个自然种群的阳茎形态进行了分析。基于其阳茎的特征，果蝇Serido的种群能够以近75%的效率被区分开来。使用曼特尔检验的分析表明，果蝇Serido的形态差异与种群间的地理距离相关。没有单一的原因可以解释观察到的模式；因此，考虑到解释阳茎进化的三个主要假说：锁钥假说、多效性和性选择，对结果进行了讨论。另外，果蝇Serido的阳茎变异性可能与环境因素有关，如温度和/或宿主仙人掌。
