Maekawa Kiyoto, Matsumoto Tadao
Department of Biology, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan.
Mol Phylogenet Evol. 2003 Apr;27(1):156-9. doi: 10.1016/s1055-7903(02)00399-8.
We investigated mitochondrial COII gene sequences of Japanese wood-feeding cockroaches (Salganea spp. and Panesthia angustipennis) in detail to investigate their biogeography. The transition (TI) numbers between each genus north and south of the Tokara Strait, which is a border of the Oriental and the Palaearctic faunal regions, were almost same, but the transversion (TV) numbers were much lower in Panesthia compared with Salganea. These tendencies suggest that multiple substitutions of TIs occurred between certain pairs of Salganea taxa and that the genera must have entered to the north of the Tokara Strait at different times. Phylogenetic relationships and estimated divergence times using TVs divergences suggest that Salganea species and Panesthia taxa north and south of the Tokara Strait were diverged from each other during the latter half of the Miocene and from the late Pliocene to the early Pleistocene, respectively. These two periods are nearly consistent with the two land expanding times in the Ryukyu Islands supported by the recent palaeogeographical hypotheses.
我们详细研究了日本食木蟑螂（Salganea属和窄翅大蠊属）的线粒体COII基因序列，以探究它们的生物地理学。作为东洋区和古北区动物区系边界的吐噶喇海峡南北各属之间的转换（TI）数几乎相同，但与Salganea相比，窄翅大蠊属的颠换（TV）数要低得多。这些趋势表明，在某些Salganea类群之间发生了TI的多次替换，而且这两个属肯定是在不同时间进入吐噶喇海峡以北地区的。利用TV差异得出的系统发育关系和估计的分歧时间表明，吐噶喇海峡南北的Salganea物种和窄翅大蠊属类群分别在中新世后半期和上新世晚期到更新世早期彼此分化。这两个时期与最近的古地理假说所支持的琉球群岛两次陆地扩张时间几乎一致。
