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Accumulation of phytoplankton in lake sediments estimated from photosynthetic pigments.

根据光合色素估计湖泊沉积物中浮游植物的积累。

基本信息

批准号：
06680498
负责人：
SOMA Yuko
金额：
$ 1.34万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06680498/
关键词：
photosynthetic pigment chlorophyll carotenoid phytoplankton lake sedimentation compounds lake sediments 堆積物

项目摘要

Phytoplankton pigments in sediment of Lake Kasumigaura were analyzed by HPLC.The depth profiles of echinenone and myxoxanthophyll, which are characteristic carotenoids of blue-green algae, showed an increase after the lock gate (Hitachigawa-suimon) was constructed 30 years ago to prevent seawater coming into the lake. The depth profile of beta-carotene suggests that the algal biomass in the lake decreased 30 years ago, being consistent with the period of the construction of the lock gate, and then increased with the increase of freshwater phytoplankton such as blue-green algae.Depth profiles of carotenoids, chlorophylls and the related pigments in the sediments of southern basin of Lake Baikal were analyzed. The photosynthetic pigments were found to be preserved through the sediment cores which spanned several hundred years. Pigments originated from green-algae, diatoms, Cryptophyceae and cyanobacteria were abundant in the sediments and major part of chlorophyll a and b were preserved as pheophytin. Biogenic perylene was detected throughout the core layrs and its presence indicates that the sediment has been under an anoxic condition.Picocyanobacteria, Synechocystis limnetica have been observed in Lake Baikal during the summer. Pigment compositions of picocyanobacteria, Synechococcus spp. and Synechocystis spp. in freshwater was studied, and the distribution and contribution of picocyanobacteria in Lake Baikal on Augest 1994 was estimated.

采用高效液相色谱法对霞浦湖沉积物中的浮游植物色素进行了分析，结果表明，蓝藻的特征类胡萝卜素--海胆酮和粘叶黄素的深度剖面在30年前修建船闸（常川水门闸）以防止海水进入霞浦湖后有所增加。β-胡萝卜素的深度剖面表明，30年前贝加尔湖藻类生物量减少，与船闸建设时期相一致，之后随着蓝藻等淡水浮游植物的增加而增加。光合色素被发现通过跨越几百年的沉积物芯保存下来。沉积物中含有丰富的绿藻、硅藻、隐藻和蓝细菌色素，叶绿素a和B主要以脱镁叶绿素的形式保存。在整个岩芯层中检测到生物成因的二萘嵌苯，其存在表明沉积物一直处于缺氧状态。夏季在贝加尔湖中观察到了Picocyanobacteria，Synechocystis limnetica。微蓝细菌、聚球藻属的色素组成。和集胞藻属（Synechocystis spp.）研究了1994年8月贝加尔湖水体中微蓝细菌的分布和贡献。