網走湖における珪藻群集の季節変化

Monthly total mass and diatom fluxes in Lake Abashiri between August 4, 2011 and November 8, 2012 were analyzed. There were three peaks of total mass flux and total diatom flux in the sampling duration. 82 diatom taxa appeared. Except for one month between June 12 and July 13, 2012, the most abundant diatom taxon was Cyclotella atomus. Diatoma tenuis was the primary taxon in only the month, and this taxon showed under 3 % occurrence in two months. These flux changes in Lake Abashiri strongly supported the assumption by a previous report that a band of laminated deposit in Abashiri sediment was formed in each half year.