中华假磷虾碳氮收支的实验研究

郭东晖; 李少菁; 陈峰; 王桂忠; 陈钢

中华假磷虾碳氮收支的实验研究

厦门大学, 海洋学系, 福建, 厦门, 361005;厦门大学, 亚热带海洋研究所, 福建, 厦门, 361005

基金项目: 国家自然科学基金资助项目(39800021);福建省自然科学基金资助项目(B9910004)

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出版历程
- 收稿日期: 2002-11-25
- 修回日期: 2003-01-02

The experimental studies on the carbon and nitrogen budgets in Pseudeuphausia sinica

Department of Oceanography, Xiamen University, Xiamen 361005, China;Institute of Subtropic Ocean, Xiamen University, Xiamen 361005, China

摘要

摘要: 实验室培养条件下,以新近孵化的卤虫(Artemiasalina)为食物,观测中华假磷虾(Pseudeuphau siasinica)雌性成体、仔虾和后期带叉幼体的碳氮收支.实验表明摄食率随食物浓度的升高呈线性提高,成体未出现饱和现象,反映其较高的摄食潜力.呼吸率(碳消耗率)与碳的摄食率及同化率分别呈线性正相关,比动力作用分别为9%~16%(摄入碳)和10%~17%(同化碳)以后期幼体更小.总氮排泄率与氮的摄食率及同化率也分别呈显著正相关,但仔虾例外.排粪率随摄食率升高而提高,从而同化效率与摄食率无关,介于0.84~0.95.食物氮源是中华假磷虾生长的主要限制因子,当摄食率低于10μg/(mg·d)(干重)时,假磷虾呈负生长.同化的氮以排泄消耗为主,体质生长次之,而蜕皮损失最少.同化的碳也以呼吸消耗和体质生长居多,但随摄食率有变化,蜕皮损失最少.在成熟雌体,估算的生殖生长(碳、氮)比蜕皮损失略高.净生长效率随摄食率(及同化率)升高而升高.达一定值后,仔虾和后期带叉幼体净生长效率略有下降.
- 中华假磷虾 /
- 碳氮收支 /
- 厦门港
Abstract: The carbon and nitrogen budgets are estmi ated on the adult females,juveniles and post-furcilia larvae of Pseudeuphausia sinica in the laboratory with newly hatching nauplii of Artemia salina as food.It is found that the ingestion rate is linearly related to the food concentration,suggesting high feeding potential.The linear correlation can be established bewteen the resp iration rate (carbon consumption rate) and carbon ingestion rate,as well as carbon assmi ilation rate.The regression coefficients (i.e.specific dynamic action coefficients) are 9%~16% (ingest C) and 10%~17% (assmi ilated C) respectively,with lower in the post-furcilia larvae.There also existed a linear correlation equation bewteen estmi ated total nitrogen excretion rate and the rates of nitrogen ingestion and assimilation separately,except for the juveniles.The defecation rates increas with increasing the ingestion rate,as a result,assmiilation efficiency is not related to the ingestion rate,ranged from 0.84~0.95.The results indicated that the nitrogen content in food particles is a key factor lmiiting the growth of P.sinica.The critical ingestion rate is 10 μg/mg body dry weight perday.A ssimilated N is lostmostly by excretion,following a llocated to somatic growth.The nitrogen loss by moult only account for a minor part.As for carbon budget,resp iration and som atic growth also account for most of assimilation,but varie with ingestion rates.Moult loss isminor.Estimated reproductive growth (C&N) in the adult fem ales accounted for somewhat higher percent of assmi ilation than the moult growth.The net growth efficiency (K₂) increasw ith increasing ingestion rates,but decreas slightly for juvenile and post-furcilia larvae after the rates up to a certain value.
- Pseudeuphausia sinica /
- carbon and nitrogen budgets /
- Xiamen Harbor

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