Abstract
Field investigations were carried out to study the habitat conditions of benthos in Yoneshiro River basin. At the same time, physical-chemical attributes were also measured. Family number of benthos was not so different in each station, but total population in branches was larger than that in main stream. The importance and effectiveness of using families was examined by field data, and some diversity indices were examined. To develop prediction models of benthos diversity indices, which are total population, family number, Shannon's diversity index and Simpson's, multiple regression analysis was carried out. The accuracy of prediction is poor for the population in the case with each family, but good for the family diversity in the case with all families.
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