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首页> 外文期刊>Harmful Algae >Mediation of benthic-pelagic coupling by microphytobenthos: an energy- and material-based model for initiation of blooms of Aureococcus anophagefferens
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Mediation of benthic-pelagic coupling by microphytobenthos: an energy- and material-based model for initiation of blooms of Aureococcus anophagefferens

机译：底栖微藻对底栖-上层耦合的介导：一种基于能量和材料的模型，用于启动嗜热金黄色葡萄球菌的水华

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摘要

We present a conceptual model for initiation of blooms of the estuarine brown-tide pelagophyte Aureococcus anophagefferens. The model is based on the observation that in addition to its well-documented stimulation by organic nutrients, Aureococcus is pre-adapted to low light levels. Its relatively low maximum (light-saturated) growth rate makes it a poor competitor with other estuarine species at high light under acclimated conditions. Its large photosynthetic antenna and relatively low quota of photoprotective pigments make it more susceptible to photoinhibition than other species to which it is compared. These same characteristics give it a competitive advantage at low light levels. In its shallow habitat, both the light level and the rate of nutrient supply from groundwater and benthic porewater are determined by the degree of benthic coupling. Experimental manipulations in a microcosm and a survey of the literature demonstrate the ability of the sediment-associated microphytobenthos (MPB) to regulate both the light- and nutrient-environment in the overlying water column. The model predicts that the growth dynamics of the MPB are such that the benthic/water column interactions tend towards one of two stable states. In one, a well-developed population of MPB restricts resuspension of particulate material and efflux of dissolved nutrients, resulting in clear and nutrient-poor overlying waters. This condition does not favor growth of Aureococcus. In the alternative state, erosion of the MPB results in turbid, nutrient-rich waters that do favor bloom initiation. Alternation between the states is caused by external physical forcing, through wind-driven mixing of the water column. Field data from Quantuck Bay, New York (USA), failed to document the transition from non-bloom to bloom conditions. Even so, they are consistent with the model's predictions.
机译：我们提出了一个概念模型的河口褐潮pelagophyte aureococcus anophagefferens绽放的启动。该模型基于以下观察结果：除了有据可查的有机养分刺激外，金黄色葡萄球菌还预先适应了弱光。它的最大（光饱和）增长率相对较低，使其在高光条件下与其他河口物种的竞争较弱。它具有较大的光合作用触角和相对较低的光防护色素配额，因此与其他同类物种相比，它更容易受到光抑制作用。这些相同的特性使其在低光照条件下具有竞争优势。在其浅层栖息地，地下水和底栖孔隙水的光照水平和养分供应速率都取决于底栖耦合程度。在微观世界中进行的实验操作和文献调查证明，与沉积物相关的微底栖动物（MPB）能够调节上方水柱中的光照和养分环境。该模型预测，MPB的生长动力使得底栖生物/水柱相互作用趋向于两个稳定状态之一。其中之一是，MPB的发达种群限制了颗粒物质的再悬浮和溶解营养物的外流，从而导致上清水和营养物质缺乏。这种情况不利于金黄色葡萄球菌的生长。在替代状态下，MPB的侵蚀会导致浑浊，营养丰富的水，这确实有利于花开。状态之间的交替是由外部物理强迫通过水柱的风驱动混合引起的。来自纽约（美国）Quantuck湾的现场数据未能记录从无花到有花的情况。即使这样，它们也与模型的预测一致。

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