Estimation of ingestion rate as nitrogen and factors creating its seasonal changes in ruditapes philippinarum population in banzu tidal flat, Tokyo bay

摘要

Assuming negligible production of pseudofaeces, the amount of food filtered by the clam is equal to the amount of food ingested. The ingestion rate estimated as nitrogen per 1m~2 per h (F) was given in the following equation: F=~7Σ_n=1(Fn.R_T.Rs.Pn).N where; Fn, filtration rate of a clam at L mm shell length at 15℃ and 35psu; R_T, correction coefficient for Fn at T℃; Rs, correction coefficient for Fn at S psu; Pn, clam density of 7 size classes and N, concentration of suspended particulate nitrogen (PN). L was given for the mean shell length of each size class.