The distribution of crustose corallines in eastern hokkaido japan and the bio geographic relationships of the flora

Adey, W.H.; Masaki, T.; Akioka, H.

Bulletin of the Faculty of Fisheries Hokkaido University 26(4): 303-313


Accession: 006631273

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Based on a series of depth-zoned collections taken by SCUBA, the relative abundances of species of crustose coralline algae along the E and S coasts of Hokkaido [Japan] were examined with regard to the major ocean currents and the resulting temperature patterns. Three geographic groupings of species were found: a cold water group strongly dominating along the E coast from Cape Erimo to Cape Nosappu; a warmer water group occurring in the northeast from Cape Nosappu to Cape Shiretoko; and 3rd, warm water group occurring in the Tsugaru Strait. The coast from Cape Erimo to Tsugaru Strait is occupied by a transitional complex of species. Based on a graphic study of the amount of contiguous coastline in the northern hemisphere occurring at various combinations of summer and winter surface water temperatures, a physical basis for the delimitation of shallow water coastal biogeographic provinces is derived. The close correlation of these patterns with the actual geographic distribution of crustose corallines in this study, and in those previously undertaken in the North Atlantic, is discussed. The cold water species are the southernmost extension in the Pacific of the broad subarctic group; most of the species present in Hokkaido also occur in the North Atlantic. The basis for the North Pacific origin of the subarctic flora is also discussed. The 2 warm water groups are referred to as cold temperate (NE Hokkaido) and warm temperate (Tsugaru Strait), and it is postulated that the centers of distribution of these provinces are respectively, in the S Okhotsk and N Sea of Japan, and the sea of Japan to the East China Sea area.