Nalepa Christine A, Shimada Keisuke, Maekawa Kiyoto, Luykx Peter
Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA (
Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama, Toyama 930-8555, Japan (
J Insect Sci. 2017 Mar 1;17(3). doi: 10.1093/jisesa/iex045.
During the period between 1999 and 2006, wood-feeding cockroaches in the Cryptocercus punctulatus Scudder species complex were collected throughout Great Smoky Mountains National Park, USA. The chromosome numbers of insects from 59 sites were determined, and phylogenetic analyses were performed based on mitochondrial COII and nuclear ITS2 DNA. The distribution of the three male karyotypes found in the park (2n = 37, 39, and 45) is mapped and discussed in relation to recent disturbances and glacial history. Clades of the three karyotype groups meet near the ridgeline separating North Carolina from Tennessee in the center of the park, suggesting that these may have originated from separate lower elevation refugia after the last glacial maximum. The timing of divergence and a significant correlation between elevation difference and genetic distance in two of the clades supports this hypothesis. The ecological role of the cockroaches in the park is discussed.
在1999年至2006年期间，在美国大烟山国家公园收集了斑点隐尾蠊物种复合体中以木材为食的蟑螂。测定了来自59个地点的昆虫的染色体数目，并基于线粒体COII和核ITS2 DNA进行了系统发育分析。绘制并讨论了在该公园发现的三种雄性核型（2n = 37、39和45）的分布情况，并将其与近期干扰和冰川历史联系起来。三个核型组的分支在公园中心将北卡罗来纳州与田纳西州分隔开的山脊线附近交汇，这表明这些可能在末次盛冰期之后源自不同的低海拔避难所。两个分支的分歧时间以及海拔差异与遗传距离之间的显著相关性支持了这一假设。还讨论了蟑螂在公园中的生态作用。
