Production, metabolism and production/biomass (P/B) ratio of Themisto japonica (Crustacea : Amphipoda) in Toyama Bay, southern Japan Sea
Production, metabolism and production/biomass (P/B) ratio of Themisto japonica (Crustacea : Amphipoda) in Toyama Bay, southern Japan Sea
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日本海南部富山湾的 Themisto japonica（甲壳纲：片足纲）的产量、代谢和产量/生物量 (P/B) 比
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
N. Shiga
中科院分区：
文献类型：
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作者：
T. Ikeda;N. Shiga
根据1990年2月1日至1991年1月30日（363天）每两周取样一次的生物量和种群结构数据，对日本南部富山湾的端足类Themisto japonica的生产和代谢进行了估算。在采样期间，平均生物量（B）为370毫克C米-2。生产（P）计算为体细胞（Pg）和蜕皮（Pe）生产的总和（P = Pg + Pe），代谢（M）计算为常规代谢（Mrtn）和昼夜垂直迁移（Mdvm）的总和。在整个采样期间，Pg和Pe分别为1934和176毫克C m-2，Mrtn和Mdvm分别为4100和1778毫克C m-2。平均每日P/B和Pg/B比值分别为0.016和0.014，平均Pg/M和P/M比值分别为0.33和0.36。假设同化效率为0.904，则摄入量计算为每363天8837 mg C m-2。在富山湾，日本赤眼蜂种群为了维持日常的生长和代谢，需要摄取相当于其生物量的6.6%的猎物，或其猎物动物（桡足类和小型磷虾类）可能总产量的30%。
The production and metabolism of the amphipod Themisto japonica in Toyama Bay, southern Japan Sea, were estimated based on their biomass and population structure data collected from every 2-week samplings from 1 February 1990 through 30 January 1991 (363 days). Over the sampling period, the mean biomass (B) was 370 mg C m-2. Production (P) was calculated as the sum of somatic (Pg) and molt (Pe) production (P = Pg + Pe), and metabolism (M) as the sum of routine metabolism (Mrtn) and diel vertical migration (Mdvm). Integrating over the entire sampling period, Pg and Pe were 1934 and 176 mg C m-2, respectively, and Mrtn and Mdvm were 4100 and 1778 mg C m-2, respectively. Mean daily P/B and Pg/B ratios were 0.016 and 0.014, respectively, and mean Pg/M and P/M ratios were 0.33 and 0.36, respectively. Assuming assimilation efficiency of 0.904, ingestion was computed as 8837 mg C m-2 per 363 days. For the daily maintenance of growth and metabolism, the T.japonica population needs to ingest an amount of prey which equates to 6.6% of their biomass, or 30% of possible total production of their prey animals (copepods and small euphausiids) in Toyama Bay.