Tsujimura, S. S. Lake Biwa Research Institute, +81-77-526-4803
Kumagai, M. S. Lake Biwa Research Institute, +81-77-526-4803
Nakahara, H. H. Kyoto University, +81-75-753-6375
APPLICATION OF THE FDC TECHNIQUE TO ESTIMATE THE IN SITU GROWTH RATE OF MICROCYSTIS
Toxic cyanobacterial blooms such as Microcystis are getting more serious problems in the freshwater ecosystem of the world than before, because its blooming areas are expanding in many places. Lake Biwa, which is the largest lake in Japan, has suffered from frequent cyanbacterial blooms in the eutrophicated coastal areas since 1983. Microcystis also became a popular species in the pelagic area of Lake Biwa in the autumn of 1997. It is uncertain that the increase of Microcystis population in the pelagic area is induced by the horizontal transport from the coastal area where Microcystis blooms are well developed. It is important to measure the in situ growth rate to understand the dynamics of Microcystis blooms in the field, because the temporal change of Microcystis abundance at a fixed point can be affected by many factors such as physical advection, diffusion, grazing mortality, etc. There are several methods available for estimating phytoplankton growth in the field. We improved the FDC (frequency of dividing cells) techniques to measure Microcystis growth rate in Lake Biwa, and got some good results.
Day: Friday, Feb. 5
Time: 11:00 - 11:15am
Location: Eldorado Hotel