Modelling the impact of benthic filter-feeders on the composition and biomass of river plankton
Modelling the impact of benthic filter-feeders on the composition and biomass of river plankton
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DOI：
10.1046/j.1365-2427.2003.01017.x
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发表时间：
2003-03-01
影响因子：
2.7
通讯作者：
Smitz, JS
中科院分区：
文献类型：
--
作者：
Descy, JP;Everbecq, E;Smitz, JS
1.POTAMON模型[Everbecq E.et al.(2001)Water Research，35,901]已经被用来模拟底栖双壳类(主要是多形德赖塞纳)对西欧低地河流(摩泽尔河)浮游植物和浮游动物的影响。在这里，我们使用POTAMON模型的一个改进版本，其中包含五种浮游植物(斯蒂芬迪斯藻、环藻、大型硅藻、骨架藻和非硅藻)，以模拟Moselle底栖双壳类的滤食效应。浮游动物在模型中由两类代表，类臂尾轮虫和类甲藻轮虫。根据实地调查的密度估计(Bachmann V.等人)。(1995)水文生态，7,185，Bachmann V.&UsSeglio-Polatera P.(1999)水文生物学，410，39)，斑马贻贝密度在不同的河流范围内变化，并在夏季全年增加到最大值。使用文献中的德雷塞纳滤水率，并假定贻贝以不同种类的浮游植物(但较少以大型丝状硅藻为食)以及轮虫为食。模拟表明，底栖滤食性动物对浮游藻类和贻贝丰富地区的水质有显著影响，它们的影响在夏季最大。因此，不同的浮游生物群体受到的影响程度不同，这取决于它们的发育时期和间接影响，例如贻贝对食草性浮游动物的捕食。典型夏季的每日碳平衡表明，底栖滤食者对浮游和底栖过程的影响：在贻贝密度较高的情况下，有机物质流向底部的通量大大增加；相反，水体中有机碳的产生和分解减少。贻贝的去除只会在下游河段推动河流的碳平衡走向自养。
1. The POTAMON model [Everbecq E. et al. (2001) Water Research, 35, 901] has been used to simulate the effect of benthic bivalves (mainly Dreissena polymorpha ) on the phytoplankton and zooplankton in a lowland Western European river (the Moselle). Here we use a modified version of the POTAMON model with five categories of phytoplankton (Stephanodiscus, Cyclotella -like, large diatoms, Skeletonema and non-siliceous algae) to model filter-feeding effects of benthic bivalves in the Moselle. Zooplankton has been represented in the model by two categories, Brachionus -like and Keratella -like rotifers.2. According to density estimates from field surveys (Bachmann V. et al. (1995) Hydroecologie Appliquee, 7, 185, Bachmann V. & Usseglio-Polatera P. (1999) Hydrobiologia, 410, 39), zebra mussel density varied among river stretches, and increased through the year to a maximum in summer. Dreissena filtration rates from the literature were used, and mussels have been assumed to feed on different phytoplankton categories (but less on large and filamentous diatoms) as well as on rotifers.3. The simulations suggest a significant impact of benthic filter-feeders on potamoplankton and water quality in those stretches where the mussels are abundant, their impact being maximal in summer. Consequently, different plankton groups were not affected to the same extent, depending on their period of development and on indirect effects, such as predation by mussels on herbivorous zooplankton.4. A daily carbon balance for a typical summer shows the effect of benthic filter-feeders on planktonic and benthic processes: the flux of organic matter to the bottom is greatly enhanced at high mussel density; conversely, production and breakdown of organic carbon in the water column are reduced. Mussel removal would drive the carbon balance of the river toward autotrophy only in the downstream stretches.