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Taxonomic study of nano-planktonic diatoms in Brackish lakes.

咸水湖纳米浮游硅藻的分类学研究。

基本信息

批准号：
08640889
负责人：
OHTANI Shuji
金额：
$ 0.77万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640889/
关键词：
Brackish lake Lakes Shinji and Nakaumi Planktonic diatoms taxonomv Species composition Seasonal variation 宍道湖,中海

项目摘要

Brackish Lakes Shinji and Nakaumi are located in Shimane Prefecture, western part of Honshu Island, Japan. These lakes are entrophic brackish lakes lying between freshwater Hii river and Japan Sea. Salinity ranges from 5 to 10 % of seawater in Lake Shinji, and from 20 to 50 % of seawater in Lake Nakaumi. Phytoplankton flora of Lake Shinji mainly comprised freshwater and brackishwater species, that of lake Nakaumi comprised brackishwater and seawater species.Species composition and seasonal variation of planktonic diatoms in these lakes were studied from April 1996 to March 1997. During fiscal year of 1997, taxonomic works of Cyclotella was mainly studied.Through the taxonomic study of nano-planktonic diatoms, 25 taxa of 14 genera were identified from these lakes. Dominant species in Lake Shinji were Cyclotella choctaw hatcheeana, Cyclotella atomus var.gracilis, Cyclotella spp., Thalassiosira pseudonana and Chaetoceros sp. Those in Lake Nakaumi were Cyclotella choctawhatcheeana, Cyclotella sp., Minidiscus comicus, Neodelphineis pelagica and Thalassiosira tenera. Cyclotella choctawhatcheeana, Cyclotella atomus var.gracilis were for the first time recognized from Lake Shinji and Lake Nakaumi. These two species were described as new species from brackish water in 1990, and 1993, respectively.In Lake Shinji, Thalassiosira pseudonana dominated in March and April, Cyclotella atomus var.gracilis dominated May to July, Cyclotella sp.3 dominated August to October. In Lake Nakaumi, Cyclotella sp.2 dominated in May and June, Neodelphineis pelagica dominated from September to October.

咸水湖新知和中美位于日本本州岛西部的岛根县。这些湖泊是位于淡水Hii河和日本海之间的富水微咸水湖泊。盐度在新池湖海水的5%到10%之间，在Nakaumi湖的海水的20%到50%之间。1996年4月至1997年3月，对新集湖浮游植物区系以淡水和半咸水种类为主，纳考米湖以半咸水和海水种类为主的浮游硅藻种类组成和季节变化进行了研究。1997财政年度主要研究环藻的分类工作，通过对纳米浮游硅藻的分类研究，从这些湖泊中鉴定出25个分类单元，隶属于14个属。其优势种为环藻、细小环藻、环藻、假海链藻和角毛藻。Nakaumi湖中的细菌有巧克力环藻、环藻、Comicus、Neodelphineis pelagica和Thalassiosira tenera。首次从信治湖和Nakaumi湖中发现了巧克力环藻、小环藻细小变种。这两个种分别于1990年和1993年被描述为微咸水中的新种。在新集湖，3、4月份的优势种为假海链藻，5-7月为优势种，8-10月为优势种，8-10月为优势种。在Nakaumi湖，5、6月份以环藻2为优势种，9~10月以水生新德尔菲尼斯虫为主。