Estimation of production and respiration rates by the ciliated protozoa community in an experimental ricefield

Estimates of production and respiration rates by a field community of ciliates were made in an experimental ricefield located in the province of Reggio Emilia (Northern Italy) from June to September 13, 1983. Particular attention was given to ciliate communities inhabiting both the water column and the sediment. Production in the sediment was higher than in the water column during the first period of rice cultivation (June–July); in the second period (August–September) production was higher in the water column. A similar trend was recorded for respiration rates. During the entire period, production was estimated at 471 KJ m^-2, while energy losses due to respiration accounted for 178 KJ m^-2. The net production efficiency (K₂) of the total ciliate community was 72.5%. Results obtained are discussed and compared with published data on ciliated Protozoa in other ecosystems.