ISSN : 1225-3480
To know the effects on temperature and body size on the clearance rate (CR) of a small tidal flat bivalve, Coecella chinensis, laboratory experiments were performed with 20 individuals of different sizes (ranging from 7 to 25 mm) at 3 different temperatures (10, 15, <TEX>$20^{\circ}C$</TEX>). The relationship between body size and CR was determined by an allometric equation. The CR of C. chinensis varied greatly ranging from 0.003 to 0.103 L/individual/hr. Both temperature and body size affected significantly on the CR of C. chinensis. The CR at <TEX>$20^{\circ}C$</TEX>was 1.5 times higher than that at <TEX>$15^{\circ}C$</TEX> and 2.8 times than <TEX>$10^{\circ}C$</TEX>. The temperature coefficient (<TEX>$Q_10$</TEX>) between 10 and <TEX>$15^{\circ}C$</TEX> was higher than that between 15 and <TEX>$20^{\circ}C$</TEX>, which indicates that C. chinensis changes its CR more rapidly in lower temperature range. As body size increased, the CR increased more than 10-fold at all temperatures. The CR relative to flesh dry weight (FDW) were fitted well to the power function: CR = a <TEX>${\times}$</TEX> <TEX>$(FDW)^b$</TEX>. The exponent value (b) of the fitted equation ranged from 0.64 to 0.70, which are similar to those of other bivalves. The weight-specific CR (<TEX>$CR_w$</TEX>) was still affected by body size (p < 0.05). This implies that smaller individuals require more energy per unit biomass for growth, and the energy requirement for growth decreases as body size increases.
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