Diatom
Online ISSN : 2186-8565
Print ISSN : 0911-9310
ISSN-L : 0911-9310
Water Quality Chart of the River Kinokawa
Using Diatom Assemblage Index to Organic Water Pollution ( DAIpo ) Based on Attached Diatom Assemblage on River Bed
Toshiharu WATANABEShihoko TANAKAToshie HIZUKA
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JOURNAL FREE ACCESS

1986 Volume 2 Pages 117-124

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Abstract

The diatom communities in the River Kinokawa, a less polluted river in Japan, were surveyed in summer 1985. In almost all stations, Homeothrix janthina was dominant in algal communities on river bed. In these co mmunities, we can find Achnanthes japonica or Nitzschia frustulum var. perpusilla with high abundancy. The former occured usualy in upper stream, the latter in downstream. From the data of diatom flora in each sampling station, water quality was estimated by using Diatom Assemblage Index to organic water pollution (DAIpo ), and water quality chart was made using the indices computed. River Pollution Index ( RPID ), of which value is able to be shown the general degree of pollution of river system, was 57. The value is comparatively higher than those of other rivers in Japan.

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© The Japanese Society of Diatomology
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