Abstract
A seasonal change in the filtration rate of Corbicula japonica in shallow experimental pond constructed to study the effect of C. japonica on bio-geochemical cycles was measured using the laboratory, outdoor tank and in situ methods. Different formulas for determining the correlation between filtration rate and water temperature were obtained in each case. The total volume of water filtered by C. japonica in the pond was estimated using these formulas. High volumes were calculated using the in situ method; they were about 2.5 ∼ 3 times higher than those calculated using the laboratory method. The amount of suspended solid (SS) removed was estimated from these volumes of water filtered and compared with the observed amount, which was calculated from the differences of SS concentrations in inflow and outflow waters and inflow water volume. The amount estimated using the in situ method showed a linear relationship to the observed one (y=1.16x + 18.6, R2=0.84). It was concluded from these results that the filtration rate of C. japonica could be expressed as y=0.336e0.0569T in relation to water temperature in the range from 10 to 30°C.
