Studies On The Physiological Energetics Of Manila Clam,ruditapes Philippinarum

Physiological energetics of suspension feeding bivalves has been extensively studied by the biodeposition method during last 20 years. Feeding physiology is the important content and key factor in physiological energetics. Filtration rate (FR), Ingestion rates (IR), clearance rates (CR) and absorption efficiency (AE) are necessary in studying physiological energetics. In this dissertation, the effects of environmental factors (temperature, food concentrations and habitat) and individual size on the feeding physiological traits (FR, IR, CR and AE) of Manila clam, Ruditapes philippinarwn, were studied in laboratory from January to June in 1998, August 1999 in static system. In addition, the carbon and energy budget of Ruditapes philippinarum had been calculated and their fluctuation with different temperature, food concentrations and dry soft weight had been discussed. Above all we build the energy equation of Manila clam with different temperature and food concentrations. The main points of my thesis have been list as follow: Relationship between IR, CR and body size were expressed as: IR=0.98W056 (R20.97); CRO.47W063 (R20.90). IR, CR and AE of Ruditapes philippinarum in sand substrate were significantly higher than those in the environment without sand substrate (ANO VA, p0.2). So we arrived at the conclusion that the optimum temperature for clam growth was about 22扖. The effects of dry tissue weight, temperature and food concentrations on minimal carbon requirements, carbon budget and energy budget had been studied and we built energy budget equation with different temperature. The diet for experiments was algae Chlorella spp. and its concentration was about 3. l4mgPOM/L. The temperature is 9C, 16 C, 22 揅 and 26 揅 respectively. The equations were listed as fallow: 100C56.04 (?1. 21) F+82.84(?12.00)R+3.33(?.1O)U-42.21(?12.09)SFG; 100C44.66 (?2. 44) F+1 8.72(?0.95)R+2.91(?0.08)U+33.71(?.98)SFG; 1 00C2 1.28 (?0. 86) F+ 9.55( ?0.48)R+l .67( ?0.03)U+67.50( ?0.50)SFG; IOOC=26.57 (?. 41) F+26.66(?.07)R + 3.29(?.28)U+43.48(?.80)SFG The energy equations with different food co...