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Indexed by:期刊论文

Date of Publication:2016-11-01

Journal:CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY

Included Journals:SCIE、ISTIC、Scopus

Volume:34

Issue:6

Page Number:1209-1217

ISSN No.:0254-4059

Key Words:Marphysa sanguinea; diel variations; metabolism; ammonia-N excretion; SDA

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 16A degrees C (+/- 0.2A degrees 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/(ga (TM) 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.