MUSSEL BEDS - LIMITING OR PROMOTING PHYTOPLANKTON
MUSSEL BEDS - LIMITING OR PROMOTING PHYTOPLANKTON
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DOI：
10.1016/0022-0981(91)90083-9
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发表时间：
1991-01-01
影响因子：
2
通讯作者：
ASMUS, H
中科院分区：
文献类型：
--
作者：
ASMUS, RM;ASMUS, H
1984 年 2 月至 1985 年 4 月期间，在靠近叙尔特岛的瓦登海测量了潮间带贻贝床上浮游植物的季节变化。为了量化贻贝床对浮游植物的吸收，使用了开放式流通系统叙尔特河水槽 (20 x 2 x 2 m)，在贻贝床上对潮水进行开渠。通过水槽的水中的浮游植物被用来计算1986年夏季三个潮汐周期内浮游植物的吸收量。在水槽的流入和流出之间，浮游植物生物量减少了37+/-20%。该数字包括贻贝的主动过滤和沉淀。贻贝床在整个尺寸范围内都减少了浮游植物生物量，从最小的 4 μm（或几 pg C.cell-1）细胞到最大的几百 μm（或几千 pg C.cell-1）硅藻。浮游植物浓度越高，贻贝床的吸收量就越高。浮游植物的浓度和摄取量之间存在显着的正相关关系。在贻贝床吸收浮游植物的同时，测量到贻贝床释放出高营养物。假设释放的铵将完全被浮游植物吸收，则根据 16:106 的 N:C 比例估算了潜在的初级生产。根据这一假设，贻贝床养分释放引起的潜在初级生产高于贻贝床对浮游植物的吸收。贻贝也可能从浮游植物以外的颗粒有机物质中提取氮。虽然贻贝极大地减少了浮游植物的生物量，但贻贝床也有可能显着促进初级生产。
Seasonal variation of phytoplankton over an intertidal mussel bed was measured in the Wadden Sea near the island of Sylt between February 1984 and April 1985. To quantify the uptake of phytoplankton by a mussel bed, an open flow-through system, the Sylt flume (20 x 2 x 2 m), canalized the tidal water over a bed of Mytilus edulis L. Changes in the content of phytoplankton in the water passing through the flume were used to calculate phytoplankton uptake over three tidal cycles in the summer of 1986. Phytoplankton biomass was reduced by 37 +/- 20% between the inflow and outflow of the flume. This figure includes active filtration of mussels and sedimentation. Phytoplankton biomass was reduced by the mussel bed over the whole size range from the smallest cells of 4-mu-m (or a few pg C.cell-1) up to the largest diatoms of several hundred-mu-m (or a few thousand pg C.cell-1). The higher the phytoplankton concentration, the higher the uptake by the mussel bed. There was a significant positive correlation between both concentration and uptake of phytoplankton. Parallel with the uptake of phytoplankton by the mussel bed, a high nutrient release by the mussel bed was measured. Potential primary production based on the N:C ratio of 16:106 was estimated, assuming that the released ammonium would be taken up entirely by phytoplankton. Following this assumption, the potential primary production induced by the nutrient release of the mussel bed is higher than the uptake of phytoplankton by the mussel bed. It is also probable that mussels extract N from particulate organic material other than phytoplankton. While mussels strongly reduce phytoplankton biomass, mussel beds also have the potential to significantly promote primary production.