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首页> 外文期刊>Estuarine Coastal and Shelf Science >Influence of variable water depth and turbidity on microalgae production in a shallow estuarine lake system - A modelling study
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Influence of variable water depth and turbidity on microalgae production in a shallow estuarine lake system - A modelling study

机译：浅水河口湖泊系统中可变水深和浊度对微藻产量的影响-模型研究

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摘要

Strongly varying water levels and turbidities are typical characteristics of the large shallow estuarine lake system of St. Lucia, one of the largest on the African continent. This theoretical study investigated the combined effects of variable water depth and turbidity on seasonal pelagic and benthic microalgae production using a mathematical model, in order to ascertain productivity levels during variable and extreme conditions. Simulated pelagic and benthic net production varied between 0.3 and 180 g C m~(-2) year~(-1) and 0 and 220 g C m~(-2) year~(-1), respectively, dependent on depth, turbidity, and variability in turbidity. Although not surprising production and biomass decreased with increasing turbidity and depth. A high variability in turbidity, i.e. an alteration of calm and windy days, could reduce or enhance the seasonal pelagic and benthic production by more than 30% compared to a low variability. The day-to-day variability in wind-induced turbidity therefore influences production in the long term. On the other hand, varying water depth within a year did not significantly influence the seasonal production for turbidities representative of Lake St. Lucia. Reduced lake area and volume as observed during dry periods in Lake St. Lucia did not reduce primary production of the entire system since desiccation resulted in lower water depth and thus increased light availability. This agrees with field observations suggesting little light limitation and high areal microalgal biomass during a period with below average rainfall (2005-2011). Thus, microalgae potentially fulfil their function in the lake food-web even under extreme drought conditions. We believe that these results are of general interest to shallow aquatic ecosystems that are sensitive to drought periods due to either human or natural causes.
机译：水位和浊度变化很大，是圣卢西亚大型浅河口湖泊系统的典型特征，这是非洲大陆最大的湖泊系统之一。这项理论研究使用数学模型研究了可变水深和浊度对季节性上层和底栖微藻生产的综合影响，以确定在可变和极端条件下的生产力水平。根据深度，模拟的浮游和底栖净产量分别在0.3至180 g C m〜（-2）年〜（-1）和0至220 g C m〜（-2）年〜（-1）之间变化，浊度和浊度变化。尽管并不令人惊讶，但随着浊度和深度的增加，产量和生物量也会下降。与低可变性相比，浊度的高可变性（即平静和大风天的变化）可以减少或提高季节性上层和底栖鱼类的产量超过30％。因此，从长远来看，风致浊度的日常变化会影响产量。另一方面，一年之内水深的变化并没有显着影响代表圣卢西亚湖的浊度的季节性产生。干旱期间在圣卢西亚湖中观察到的湖泊面积和体积的减少并未减少整个系统的初级产量，因为干燥导致水深降低，从而增加了光的利用率。这与实地观察结果一致，后者表明在降雨量低于平均水平的时期（2005-2011年）几乎没有光限制，而区域微藻生物量却很高。因此，即使在极端干旱条件下，微藻也有可能在湖泊食物网中发挥其作用。我们认为，这些结果对于由于人为或自然原因而对干旱时期敏感的浅水生态系统具有普遍意义。

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