2024 Volume 37 Issue 3 Pages 45-55
The participatory biological monitoring survey for Osaka Bay has been conducted by a collaboration among various entities since 2008. We analyzed distribution of 34 representative macrobenthos and its factor of changes in the distribution area with water quality. The percentage of occurrence of two macrobenthos species increased and that of 5 species decreased over a 12-year period. The results of water quality monitoring in the coastal area of Osaka Bay showed that TN and TP decreased overall and water quality changed, while nutrient levels remained high in the inner part of the bay. Factors contributing to the distribution of barnacles and representative attached bivalves were analyzed using logistic regression analysis, and were considered to be related to trophic state such as TN. Data from a long-term citizen survey reaffirmed the usefulness and role of citizen participatory biological monitoring in the coastal areas of Osaka Bay.
