Nitrogen metabolism of the filter‐feeding bivalve Corbicula japonica and its significance in primary production of a brackish lake in Japan
Nitrogen metabolism of the filter‐feeding bivalve Corbicula japonica and its significance in primary production of a brackish lake in Japan
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滤食性双壳类蚬的氮代谢及其对日本咸水湖初级生产的意义
DOI：
10.4319/lo.1993.38.5.0997
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发表时间：
1993
影响因子：
4.5
通讯作者：
I. Koike
中科院分区：
文献类型：
--
作者：
M. Yamamuro;I. Koike
通过两种方法同时测定了信池湖滤食性双壳类日本蚬（Corbicula japonica）对颗粒态氮的吸收和营养盐的排泄：一种是用完整沉积物进行的连续流实验室培养，另一种是用底栖室进行的原位测量。C.从原位测量估计的日本超过颗粒有机氮（PON）的吸收速率，表明生物扰动或其他非代谢过程中的铵向上通量的参与。连续培养法的结果与C.日本在自然条件下在新知湖的自然栖息地，C。日本粳稻以铵的形式排泄4. 5 mg-atoms Nm-2d-1，以粪便和假粪便的形式排泄4. 6 mg-atoms Nm-2d-1，同时以10. 4 mg-atoms Nm-2d-1的速率吸收PON。这些结果表明C.粳稻通过维持含氮物质的快速循环，在刺激初级生产中起重要作用。
Uptake of particulate nitrogen and nutrient excretion by the filter-feeding bivalve Corbicula japonica in Lake Shinji was measured simultaneously by two methods: a continuous flow laboratory incubation with an intact sediment and an in situ measurement with a benthic chamber. The excretion rate of ammonium by C. japonica estimated from the in situ measurement exceeded the uptake rate of particulate organic nitrogen (PON), suggesting the involvement of bioturbation or other nonmetabolic process in the upward flux of ammonium. On the other hand, the results from the continuous incubation method agreed well with the growth rate of C. japonica under natural conditions. In the natural habitat of Lake Shinji, C. japonica excreted 4.5 mg-atoms N m-2 d-l as ammonium and 4.6 mg-atoms N m-2 d-l as feces and pseudofeces while taking up PON at a rate of 10.4 mg-atoms N m- 2 d-l. These results suggest that C. japonica plays an important role in stimulating primary production by maintaining rapid recycling of nitrogenous materials.