CONTRIBUTION OF RESUSPENDED MICROPHYTOBENTHOS TO TOTAL PHYTOPLANKTON IN THE EMS ESTUARY AND ITS POSSIBLE ROLE FOR GRAZERS
CONTRIBUTION OF RESUSPENDED MICROPHYTOBENTHOS TO TOTAL PHYTOPLANKTON IN THE EMS ESTUARY AND ITS POSSIBLE ROLE FOR GRAZERS
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DOI：
10.1016/0077-7579(92)90049-k
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发表时间：
1992-12-01
期刊：
影响因子：
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通讯作者：
VANBEUSEKOM, JEE
中科院分区：
文献类型：
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作者：
DEJONGE, VN;VANBEUSEKOM, JEE
提供了EMS河口(荷兰/德意志联邦共和国)下游、中游和上游(Dollard)微型底栖植物(主要是底栖硅藻)和浮游植物的叶绿素a数量的数据。利用这些数据估算了不同河段主要航道中悬浮微型底栖动物对浮游植物总生物量的贡献。这一计算是基于“有效风速”与微型植物总悬浮比例之间的关系。河口下游水柱和表层0.5厘米沉积物中活藻的叶绿素a总量(18-10(3)千克)是杜拉德(8.10(3)千克)的两倍。在整个河口，浮游植物的叶绿素a含量(15.10(3)kg)显著高于真正的浮游植物(10.10(3)kg)。在EMS河口下游，悬浮的小型浮游植物约占浮游植物总数的22%，杜鹃约占60%。整个河口水体中总叶绿素a的30%以上由悬浮的小型底栖植物组成。因此，在食物相对较少的春季，浮游微型底栖动物的贡献量相当于浮游植物的数量，因此，它可能是主要水道摄食尺足类动物的重要食物来源。每年，在潮滩上方的水中再悬浮的微型底栖植物构成了生活在潮滩上的滤食者可获得的食物的一半。
Data are presented on the amounts of chlorophyll a from microphytobenthos (mainly benthic diatoms) and phytoplankton in lower, middle and upper reaches (Dollard) of the Ems estuary (The Netherlands/Federal Republic of Germany). The data are used to estimate the contribution of suspended microphytobenthos to the total phytoplankton biomass in the main channels of the different reaches. This calculation is based on a relation between 'effective wind speed' and the resuspended fraction of the total microphytobenthos.The total amount of chlorophyll a from vital algae in the water column and in the top 0.5 cm of the sediments in the lower reaches of the estuary (18-10(3) kg) is twice the amount in the Dollard (8.10(3) kg). For the entire estuary, the amount of chlorophyll a derived from microphytobenthos present in the top 0.5 cm of the sediments and in the water column (15.10(3) kg) is significantly greater than the amount from real phytoplankton (10.10(3) kg).In the lower reaches of the Ems estuary suspended microphytobenthos makes up approximately 22% of the total phytoplankton; for the Dollard, it is approximately 60%. Over 30% of the total chlorophyll a in the water column of the entire estuary consists of suspended microphytobenthos. Therefore, it may be an important food source for grazing calanoid copepods in the main channels during spring when relatively little food is available and the contribution of suspended microphytobenthos equals the amount of phytoplankton sensu stricto. On an annual basis, the resuspended microphytobenthos in the water above the tidal flats makes up half the food available to filter feeders living on these tidal flats.