Genetic isolation and speciation within species by way of mountain formation: Approached utilizing genetic analyses of selected headwater-specific aquatic insects

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In the Japanese Archipelago, intense crustal deformation occurred during the Quaternary period; Mountain formation also continues presently. Creatures inhabiting this Archipelago must have been significantly affected. As such, this is a particularly well suited region for comparative studies of genetic structure with respect to geohistorical events (e.g., isolation of populations associated with orogenic activity). These are often more difficult to detect elsewhere in the world. Although, there are a few studies showing such relationships in detail.In this study, we focused on several aquatic insect species adapted to inhabit the headwaters, and compared their population structures and their genetic structures. As a result of this, some clear cases have been gathered identifying modes of differentiation by means such as, mountain ranges, or differentiation by massif level. Notably, some of these results have already been published in some international journals.