Regulation of plankton and nutrient dynamics by profundal quagga mussels in Lake Michigan: a one-dimensional model
Regulation of plankton and nutrient dynamics by profundal quagga mussels in Lake Michigan: a one-dimensional model
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DOI：
10.1007/s10750-018-3547-6
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发表时间：
2018-02
期刊：
影响因子：
2.6
通讯作者：
Chunqi Shen;Q. Liao;H. Bootsma;C. Troy;D. Cannon
中科院分区：
文献类型：
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作者：
Chunqi Shen;Q. Liao;H. Bootsma;C. Troy;D. Cannon
入侵的德莱森贻贝改变了五大湖的浮游生物丰度和养分循环。在这项研究中，开发了一个一维水动力-生物地球化学耦合模型来研究它们对密歇根湖中深度近海地点的影响。模型模拟表明，可以很好地再现水面温度和垂直热结构。该生物模型在模拟垂直混合的驱动下，解决了水体中营养物质、浮游生物和碎屑的运输和转化。底部边界增加了贻贝的吃草和排泄。生物学模型预测，到春末，整个水体中浮游植物生物量将显着下降，溶解磷（DP）将大幅增加。但夏季由于层结作用较强，浮游植物的减少和DP的增加仅限于水底20 m。模型结果还表明，贻贝可以最大程度地向底栖生物输送颗粒，因为模拟的颗粒磷底栖扩散通量平均超过被动沉降率 4.2 倍。超过 10 个月的模型模拟表明，深海贻贝有可能显着改变水体中能量和营养物质的分布，即使在深层和分层环境中也是如此。
Invasive dreissenid mussels have altered plankton abundance and nutrient cycling in the Great Lakes. In this study, a 1-D hydrodynamic-biogeochemical coupled model is developed to investigate their effects at a mid-depth offshore site in Lake Michigan. Model simulation shows that water surface temperature and vertical thermal structure can be well reproduced. Driven by the simulated vertical mixing, the biological model solves the transport and transformation of nutrients, plankton and detritus in the water column. Mussel grazing and excretion are added at the bottom boundary. The biological model predicts a notable decline of phytoplankton biomass and considerable increase of dissolved phosphorus (DP) in the entire water column at the end of spring. However, the reduction of phytoplankton and the increase of DP are limited to the bottom 20 m in summer as a result of the strong stratification. Model results also show that mussels can maximize particle delivery to the benthos, as the modeled benthic diffusive flux of particulate phosphorus exceeds the passive settling rate by 4.2× on average. Model simulation over a 10-month period indicates that profundal mussels have the potential to significantly change the distribution of energy and nutrients in the water column, even in a deep and stratified environment.