title: [Oxygen consumption and ammonia-N excretion rates of Coelomactra antiquata].
abstract: With laboratory experiments, this paper studied the oxygen consumption rate (OCR) and ammonia-N excretion rate (NR) of Coelomactra antiquata at different levels of dissolved oxygen (DO) and water temperature. The results indicated that at 25 degrees C and 3.11 +/- 0.15 mg DO x L(-1), C. antiquate had a comparatively stable OCR and NR, which maintained at 0.74 +/- 0.05 mg x g(-1) x h(-1) and 2.56 +/- 0.05 micromol x g(-1) x h(-1), respectively. When DO was lower than 3.11 +/- 0.15 mg x L(-1), the metabolism of C. antiquate became abnormal, and its OCR was decreased with decreasing DO until suffocate, with a suffocate point 1.22 +/- 0.06 mg L(-1) at 25 degrees C. The NR also declined with decreasing DO, which ceased later than oxygen consumption. There was a quadratic linear relationship between OCR and water temperature (OCR = -0.0027T(2) + 0.1367T - 0.9557, R2 = 0.9724). When water temperature was 25.3 degrees C, the OCR arrived to its maximum value 0.77 mg x g(-1) x h(-1). The O/N ratio at optimal temperature (15-20 degrees C) was higher than that at low (10 degrees C) and high temperature (25 degrees C and 30 degrees C). To maintain its standard metabolism, C. antiquata consumed more fat under fit condition, while more protein under stress.
authors.affiliation: Key Constructing Laboratory of Marine Biotechnology of Jiangsu Province, College of Oceanography, Huaihai Institute of Technology, Lianyungang 222005, China. mxp2002@hotmail.com
authors.forename: Xueping
authors.initials: X
authors.lastname: Meng
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Dong
authors.forename: Hanliang
authors.initials: H
authors.lastname: Cheng
authors.forename: Xiaoying
authors.initials: X
authors.lastname: Li
authors.forename: Jiale
authors.initials: J
authors.lastname: Li
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000818:Animals; D001692:Biological Transport; D004734:Energy Metabolism; D008974:Mollusca / Q000378:metabolism*; D008991:Monitoring, Physiologic; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D013696:Temperature
chemical_list: D000641:Ammonia; D010100:Oxygen