Diel variation in metabolism and ammonia excretion of <Emphasis Type="Italic">Marphysa sanguinea</Emphasis> (Polychaeta: Eunicidae) |
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| Authors: | Dazuo Yang Fudi Chen Yibing Zhou Zhilong Xiu |
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| Institution: | 1.College of Life Science and Technology,Dalian University of Technology,Dalian,China;2.Key Laboratory of Marine Bio-Resources Restoration and Habitat Reparation in Liaoning Province,Dalian Ocean University,Dalian,China;3.Key Laboratory of North Mariculture, Ministry of Agriculture,Dalian Ocean University,Dalian,China |
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| Abstract: | Polychaetes provide an excellent food resource for fish and represent the dominant zoobenthos in marine ecosystems. Diel variation in the rates of metabolism and ammonia-N excretion of Marphysa sanguinea were studied. The worms were grouped according to their wet body weight into small (S; 1.24±0.06 g), medium (M; 4.00±0.30 g), and large (L; 8.54±1.08 g) categories. Their weight-specific metabolic rates, based on aerobic respiration (R), were measured at 16°C (±0.2°C) and classed as either routine (R R) or standard (R S) rates. Both respiration types decreased with increasing body weight. Respiration was described by R = a W b, where b was -0.400 9 and -0.532 0 for R R and R S, respectively. Diurnal changes in R S for each group was relatively flat, with a slightly increasing trend with time, but was relatively stable as a whole. R R of the diurnal variation of worms was higher than R S, but both had similar overall trends. The peak values of specific dynamic action (SDA) (R SDA) in the S, M, and L groups were 2.704, 1.149, and 0.682 mg/(g?h), respectively. The durations of SDA were 13, 6, and 6 h, respectively and the energy expenditures of SDA were 377.98, 117.34, and 74.94 J/g, respectively. These data indicate that the metabolic rates were higher in smaller individuals, which is advantageous for their rapid growth. |
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