| 摘要: |
| 以春季长江口缢蛏(Sinonovacula constricta)、河蚬(Corbicula fluminea)和光滑河兰蛤(Potamocorbulalaevis)为研究对象, 研究了此3 种滤食性贝类的摄食生理参数, 并根据能量平衡原理估算了3种双壳贝类的碳、氮收支情况。结果表明, (1)3 种双壳贝类从滤食藻类中摄取的有机碳源主要通过呼吸代谢消耗、以粪便的形式排出, 少部分随排泄代谢产物流出, 余下的碳主要用作贝类自身的生长。缢蛏的碳收支方程式为100.00C(摄食碳)= 20.17F(粪便碳)+ 50.05R(呼吸碳)+ 9.86U(排泄碳)+ 19.92P(生长碳), 河蚬的碳收支方程式为100.00C = 31.29F + 37.40R + 5.05U + 26.26P, 光滑河兰蛤的碳收支方程式为100.00C = 44.13F + 33.08R + 11.05U + 11.74P。(2)由于贝类在呼吸代谢中没有氮排放, 故3 种贝类的生长氮占总摄食氮的比例较碳大。因此, 缢蛏氮收支方程式为100.00C(摄食氮)= 28.22F(粪便氮)+49.38U (排泄氮)+ 22.40G(生长氮), 河蚬的氮收支方程式为100.00C = 45.05F + 23.99U + 30.96G, 光滑河兰蛤的氮收支方程式为100.00C = 46.97F + 32.95U + 20.08G。 |
| 关键词: 滤食性贝类 碳、氮收支 生长率 生态效率 |
| DOI：10.11759/hykx20130916001 |
| 分类号: |
| 基金项目:上海市长江口中华鲟自然保护区项目; 长江口底栖贝类环境适应性研究(沪鲟保科20090826001) |
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| Study on carbon and nitrogen budgets of three bivalves in Yangtze River estuary |
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| Abstract: |
| The Sinonovacula constricta, Corbicula fluminea and Potamocorbula laevis in Yangtze River estuary in spring were used as research objects. The feeding physiological parameters of these three filter-feeding bivalves were examined, and the carbon and nitrogen budgets of the three main bivalves were estimated according to energy balance principle. The result indicated that the three kinds of bivalves obtained carbon source by filtering unicellular algae. The main parts were consumed by breathing and directly discharged as dejection, and a small part was discharged by excretion. The remaining carbon was used for its growth and development. The carbon balance equation of Sinonovacula constricta was: 100.00C(feeding carbon)=20.17F(dejection carbon)+50.05R(breathing carbon)+9.86U(excretion carbon)+19.92P(growing carbon). The carbon balance equation of Corbicula fluminea was: 100.00C = 31.29F + 37.40R + 5.05U + 26.26P. The carbon balance equation of P. laevis was: 100.00C = 44.13F + 33.08R + 11.05U + 11.74P. Since bivalves do not discharge nitrogen in the respiratory metabolism, the three bivalves’ growing nitrogen made up more parts of the total feeding nitrogen than those of carbon. Therefore the nitrogen balance equation of S. constricta was: 100.00C(feeding nitrogen) = 28.22F(dejection nitrogen) + 49.38U(excretion nitrogen) + 22.40G(growing nitrogen). The nitrogen balance equation of C. fluminea was: 100.00C = 45.05F + 23.99U + 30.96G. The nitrogen balance equation of P. laevis was: 100.00C = 46.97F + 32.95U + 20.08G. |
| Key words: filter-feeding bivalves carbon and nitrogen balance growth rate ecological efficiency |
