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首页> 外文期刊>Estuarine Coastal and Shelf Science >Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands)
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Grazing by meso- and microzooplankton on phytoplankton in the upper reaches of the Schelde estuary (Belgium/The Netherlands)

机译：在Schelde河口上游（比利时/荷兰）的中浮游藻和微浮游藻在浮游植物上放牧

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In contrast with the marine reaches of estuaries, few studies have dealt with zooplankton grazing on phytoplankton in the upper estuarine reaches, where freshwater zooplankton species tend to dominate the zooplankton community. In spring and early summer 2003, grazing by micro- and mesozooplankton on phytoplankton was investigated at three sites in the upper Schelde estuary. Grazing by mesozooplankton was evaluated by monitoring growth of phytoplankton in 200 μm filtered water in the presence or absence of mesozooplankton. In different experiments, the grazing impact was tested of the calanoied copepod Eurytemora affinis, the cyclopoid copepods Acanthocyclops robustus and Cyclops vicinus and the cladocera Chydorus sphaericus, Moina affinis and Daphnia magna/pulex. No significant grazing impact of mesozooplankton in any experiment was found despite the fact that mesozooplankton densities used in the experiments (20 or 40 ind. l~(-4)) were higher than densities in the field (0.1-6.9 ind. l~(-1)). Grazing by microzooplankton was evaluated by comparing growth of phytoplankton in 30 and 200 μm filtered water. Microzooplankton in the 30-200 μm size range included mainly rotifers of the genera Brachionus, Trichocerca and Synchaeta, which were present from 191 to 1777 ind. l~(-1). Microzooplankton had a significant grazing impact in five out of six experiments. They had a community grazing rate of 0.41-1.83 day~(-1) and grazed up to 84% of initial phytoplankton standing stock per day. Rotifer clearance rates estimated from microzooplankton community grazing rates and rotifer abundances varied from 8.3 to 41.7 μl ind.~(-1) h~(-1). CHEMTAX analysis of accessory pigment data revealed a similar phytoplankton community composition after incubation with and without microzooplankton, indicating non-selective feeding by rotifers on phytoplankton.
机译：与河口的海洋河段相比，很少有研究涉及在河口上游的浮游植物上放牧的浮游动物，在这里淡水浮游动物种类占主导地位。在2003年春季和夏季初，在Schelde上河口的三个地点调查了微型浮游动物和中游浮游植物对浮游植物的放牧。在存在或不存在中游浮游动物的情况下，通过监测200μm过滤水中浮游植物的生长来评估中游浮游动物的放牧。在不同的实验中，测试了钙化co足类Eurytemora affinis，摆线co足类Acanthocyclopsrobusus和Cyclops vicinus和克氏梭子蟹Chydorus sphaericus，Moina affinis和Daphnia magna / pulex的放牧影响。尽管实验中使用的中密度浮游动物密度（20或40 ind.l〜（-4））高于田间密度（0.1-6.9 ind。l〜（ -1））。通过比较30和200μm过滤水中浮游植物的生长来评估微浮游动物的放牧。大小在30-200μm范围内的微浮游动物主要包括Brachionus，Trichocerca和Synchaeta的轮虫，它们存在于191至1777 ind。 l〜（-1）。 Microzooplankton在六个实验中有五个实验具有明显的放牧影响。他们的社区放牧率为0.41-1.83天〜（-1），每天放牧高达浮游植物初始存量的84％。根据微浮游动物的放牧率和轮虫丰度估算的轮虫清除率从8.3〜41.7μlind。〜（-1）h〜（-1）不等。 CHEMTAX对辅助色素数据的分析显示，在有或没有微浮游动物的情况下孵育后，浮游植物群落组成相似，表明轮虫对浮游植物的非选择性摄食。

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