1996 年 57 巻 4-2 号 p. 545-552
As a part of Biwako Transport Experiment (BITEX'93) in the late summer of 1993, the population dynamics of planktonic crustacea in Lake Biwa were studied by a quantitative sampling regime. Crustacea were collected on a two-day interval at three stations in the two basins and also at the boundary between the basins. Two copepod species, Eodiaptomus japonicus and Mesocyclops dissimilis, were dominant and two branchiopod species, Daphnia galeata and Diaphanosoma brachyurum, were less abundant. Temporal changes in density of their life stages at a site were caused by horizontal transfer of patchy assemblages rather than by individual development. Whereas typhoons disturbed the lake ecosystem during the study period, no direct effect of typhoons was detected on crustracean distributions.