Diel variation in metabolism and ammonia excretion of Marphysa sanguinea (Polychaeta: Eunicidae)

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• 作者：Dazuo Yang 杨大佐 ; Fudi Chen 陈福迪…
• 关键词：Marphysa sanguinea ; diel variations ; metabolism ; ammonia ; N excretion ; SDA
• 刊名：Chinese Journal of Oceanology and Limnology
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：6
• 页码：1209-1217
• 全文大小：370 KB
• 刊物主题：Oceanography;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5005
• 卷排序：34

文摘

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 = aWb, 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.