Zoogeographic subdivision of the north-western Sea of Japan based on species areas of pelagic nekton

A new approach to biogeographical division was used to divide the north-western Sea of Japan into fragments with a uniform latitudinal zonal status of pelagic nekton species. This approach is based on computerized plotting of maps representing spatial distribution of continuous fields. Computer mapping of the study area was carried out in various time aspects: intradaily, interseasonal, and interannual.