Seasonal Changes in Water Quality and Standing Stocks of Attached Microalgae in Two Rivers of Kochi.

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Seasonal changes in water quality and biomass of microalgae attached on the surface of riverbed rocks were investigated in two rivers, mesotrophic Monobe and oligotrophic Ioki Rivers, in Kochi. The concentrations of ammonium-nitrogen, chemical oxygen demand, and suspended solid in Monobe River were significantly higher than those in Ioki River. Annual average of standing stocks of attached microalgae in Monobe River was 6.7μg-Chl . a/cm2, which was 4 times greater than that in Ioki River (1.6 μg-Chl. a/cm2) . The biomass increased in spring and decreased drastically in early summer, then increased again in autumn. The most predominant species among the attached microalgae was Homoeothrix juliana, Cyanophyceae, in both rivers, and diatom was usually less than 30 %. There is no obvious relationship between water quality and microalgal standing stock, suggesting that chemical quality of river water affects on algal growth, rather than on biomass.
日本水産増殖学会の論文