Microzooplankton: major herbivores in an estuarine planktonic food web
Microzooplankton: major herbivores in an estuarine planktonic food web
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微型浮游动物：河口浮游食物网中的主要食草动物
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Iverson
中科院分区：
文献类型：
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作者：
J. Putland;R. Iverson
平均而言，微型浮游动物摄取的浮游植物生产力是美国佛罗里达州阿帕拉契科拉湾中浮游动物群落的10倍。微型浮游动物在冬季和夏季分别摄取了75%的浮游植物生产力。纤毛虫，特别是纤毛虫，在夏季繁殖期微型浮游动物的食物中占50%的比例。由于微型浮游动物是具有较高营养水平的生物的猎物，如桡足类、鱼类幼体和牡蛎，我们认为能量和质量主要从浮游植物通过微型浮游动物流向阿巴拉契科拉湾的较高营养水平。在我们的研究期间，阿巴拉契科拉河排泄量的减少导致了在特定盐度下微型浮游动物的捕食率、摄食率和生产力的下降。河流流量的减少也增加了高盐度水的面积范围，那里的微型动物-浮游生物的摄入量和生产力相对较低。由于微型浮游动物是阿巴拉契科拉湾河口食物网的关键组成部分，上游引水增加了海湾高盐度水域的面积，预计会降低微型浮游动物的生产力，从而降低海湾高营养层的生产力。
Microzooplankton, on average, ingested 10 times more phytoplankton productivity than Acartia tonsa, which dominates the mesozooplankton community in Apalachicola Bay, Florida, USA. Microzooplankton ingested 75% of phytoplankton productivity during winter and summer, respectively. Ciliates, particularly ciliates 50%) component of the microzooplankton diet during the summer high produc- tivity period. Because microzooplankton are prey for organisms occupying higher trophic levels, such as copepods, fish larvae, and oysters, we propose that energy and mass flows mainly from phyto- plankton through microzooplankton to higher trophic levels in Apalachicola Bay. A reduction in dis- charge from the Apalachicola River during our study period led to reductions in rates of grazing, ingestion, and productivity of microzooplankton at a particular salinity. Reduced river discharge also increased the areal extent of higher salinity water where ingestion and productivity of microzoo- plankton were relatively low. Because microzooplankton are key constituents of the estuarine food web in Apalachicola Bay, upstream water diversion that increases the areal extent of higher salinity water in the bay, can be expected to lower microzooplankton productivity and therefore reduce higher trophic level productivity in the bay.