studies onphytoplankton species and dissolved gas production

本研究的目的是显示浮游植物丰度的时间变化和溶解气体，如二甲基硫（DMS）的高分辨率的时间尺度在春季浮游植物水华在丰加湾，日本。为此，系泊系统，其中包含自动采样器。CTD和天然荧光记录仪。自动采样器以3-4天的间隔采集海水。每隔10分钟记录一次水温、盐度和水下天然荧光强度。使用R/V Ushio Maru和T/S Oshoro Maru进行系泊的部署和恢复以及海洋学观测。2000年1月至4月和2000年12月至2001年3月，北海道大学水产系。2001年我们集中分析了收集到的数据，并作了几次口头报告。本研究的结果总结如下。2月初硅藻密度较低（7x10^5个细胞<-3>）。密度增加， 关于我们 在2月中旬达到高峰，3月上旬达到最大值（2.3 × 10^8个细胞<-3>），3月下旬下降（2.1 × 10^7个细胞<-3>）。到3月中旬，海链藻和海线藻占硅藻细胞总数的90%以上。特别是，海链藻物种占主导地位的硅藻群落从2月下旬至3月上旬（75-90%）。而角毛藻在3月下旬占优势（72%）。DMS浓度从2月到3月增加（最大值）。6.3 nM）。三月份，颗粒物和溶解性DMSP的浓度变得非常高。开花期和非开花期DMS/溶解态DMSP和溶解态DMSP/颗粒态DMSP的比值不同。这些结果表明，颗粒DMSP池的质量，这是由于植物种类组成。以及DMPS从颗粒到溶解态DMSP的分解速度。从溶解的DMSP到DMS。和DMS本身在这两个时期是不同的。少

The present study aims to show temporal changes in phytoplankton abundance and dissolved gases such as dimclhylsulfidc (DMS) with high resolution of time scale during spring phytoplankton bloom in Funka Bay, Japan. For the purpose, mooring system, which contained autosamplers. CTD and natural fluorescence loggers, was deployed. The autosampler collected seawater with 3-4 days intervals. Water temperature, salinity and underwater natural fluorescence intensity were recorded every 10 minutes. Deployment and recovery of the mooring as well as oceanographic observations were conducted using R/V Ushio Maru and T/S Oshoro Maru. Faculty of Fisheries, Hokkaido University, from January to April 2000 and from December 2000 to March 2001. In 2001. we concentrated in analyzes of the data collected and made several oral presentations. The findings through the present study were summarized as follows. Diatom density was low (7x10^5 cells m^<-3>) in the beginning of February. The density increased fr … More om the middle of February and reached the maximum in the beginning of March (2.3x10^8 cells m^<-3>) and decreased by the end of March (2.1x10^7 cells m^<-3>). By the middle of March, Thalassiosira species and Thalassionemane**schioides accounted for > 90% of the total diatom cells. In particular, Thalassiosira species dominated the diatom community from the late February to the early March (75-90%). while Chaetoceros species predominated in the late March (72%). The DMS concentration increased from February to March (max. 6.3 nM). The concentration of particulate and dissoloved DMSP became extremely high in March. The ratios of DMS/dissolved DMSP as well as dissolved DMSP/particulatc DMSP were different between blooming and non-blooming periods. These results suggested that the quality of particulate DMSP pool, which resulted from phyloplanklon species composition. and the decomposition velocities from particulate DMPS to dissolved DMSP. from dissolved DMSP to DMS. and of DMS itself were different between both the periods. Less