The distribution of the role of protozoa (flagellates) in lakes.

湖泊中原生动物（鞭毛虫）的分布作用。

基本信息

批准号：
06640828
负责人：
TAKAMURA Noriko
金额：
$ 1.02万
依托单位：
NATIONAL INSTITTE FOR ENVIRONMENTAL STUDIES (NIES)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06640828/
关键词：
LAKES MICROBIRK FOOD CHAIN PIOOPLANKTON FLAGELLATES CILIATES TOP-DOWN DISTRIBUTION BOTTOM-UP Microbial food web nanoflagellates picoplankton lake 鞭毛藻栄養レベル

项目摘要

Relationships of bacterial, picocyanobacterial, eucaryotic picoplankton, nanoflagellate and ciliate abundances to each other and to chlorophyll a (Chl. a), total phosphorus (TP), total nitrogen (TN) and TN : TP ratio in 31 epilimnetic waters during the warm season were investigated. The abundances of bacteria and ciliates were postitively correlated with TP,TN and Chl. a, and negatively with TN : TP ratio. Linear regressions on TP and Chl. a accounted for 51% and 34% of the variability in bacterial and ciliate abundances, respectively. The abundance of heterotrophic nanoflagellates was not correlated with that of bacteria.Polyurethane foam units (PFU) were set in the epilimnion of 15 Japanese waters and protozoan species (phytomastigophora, zoomastigophora, sarcodina and ciliata) in the squeezed water from the PFU were recorded through a high-definition (HD) TV monitor (Chu-ou mushen THMC-21BH/CH), which was connected with a HD video camera system (Nikon HQ-130C and PA-160) and the microscope (Olympus BH2) . The fauna of the protozoa in Japanese lakes was reported for first time by the present study.The effects of silver carp on plankton communities were investigated with 6 enclosres set in Lake Kasumigaura. The 9% of the variability in heterotrophic nannofiagellate (HNF) abundance was accounted by both cladoceran (top-down effect) and bacteria (bottom-up effect) abundanes. Picocyanobacteria abundanec did not account for the variability in HNF abundance, although it is well known that HNF feeds on picocyanobacteria as well asbacteria. The variability in autotrophic flagellate abundance was closedly related with both the fish density and the dissolved inorgenic nitrogen amount.

暖季期间 31 个前湖水域细菌、微微蓝藻、真核微微浮游生物、纳米鞭毛虫和纤毛虫丰度相互之间以及与叶绿素 a (Chl. a)、总磷 (TP)、总氮 (TN) 和 TN: TP 比值的关系被调查。细菌和纤毛虫的丰度与TP、TN、Chl呈正相关。 a，与 TN : TP 比率呈负相关。 TP 和 Chl 的线性回归。 a 分别占细菌和纤毛虫丰度变异的 51% 和 34%。异养纳米鞭毛虫的丰度与细菌的丰度没有相关性。在日本15个水域的表层中设置了聚氨酯泡沫单元（PFU），并通过PFU的压榨水中的原生动物物种（植物鞭毛虫、蠕虫鞭毛虫、肉虫和纤毛虫）进行了记录。高清 (HD) 电视监视器 (Chu-ou mushen THMC-21BH/CH)，与高清摄像机系统（尼康HQ-130C和PA-160）和显微镜（奥林巴斯BH2）连接。本研究首次报道了日本湖泊原生动物区系。以霞浦湖6个围场为对象，研究了鲢鱼对浮游生物群落的影响。异养纳米鞭毛虫 (HNF) 丰度的 9% 变异是由枝角动物（自上而下效应）和细菌（自下而上效应）丰度造成的。尽管众所周知，HNF 以微微蓝藻和细菌为食，但 Picocyanobacteria abundanec 并未解释 HNF 丰度的变化。自养鞭毛丰度的变化与鱼类密度和溶解的无机氮量密切相关。