1989 Volume 50 Issue 2 Pages 129-137
When the biological assessment of water pollution using attached algal corn munitiesis done, it is an important problem whether or not the algal floras are same on different substrata. This investigation was carried out to make it clear in an artificial water way. Following facts have been clarified through the research.
In the beginning of succession process, the diatom assemblages were considerably different with each other between different substrata in their species components, and also the variation of their values of diatom assemblage index to organic water pollution (DAIpo) was large. However, the difference among the assemblages disappeared and DAIpo values became almost equal, in a mature stage of succession.
From the results, it seems to be suggested that samples collected from various substrata in addition to stones or rocks are useful to provide the proper judgement to water pollution, so far as we use the samples in the mature stage of succession under the prearranged condition.
