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首页> 外文期刊>Harmful Algae >Effects of a Prorocentrum minimum bloom on light availability for and potential impacts on submersed aquatic vegetation in upper Chesapeake Bay
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Effects of a Prorocentrum minimum bloom on light availability for and potential impacts on submersed aquatic vegetation in upper Chesapeake Bay

机译：原切花最少开花对切萨皮克湾上层淹没的水生植物的光利用率及其潜在影响

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摘要

Extraordinary spring blooms of the dinoflagellate Prorocentrum minimum have been a recurring feature of upper Chesapeake Bay for many years. Though not thought to be toxic in Chesapeake Bay, these blooms produce extraordinarily high concentrations of chlorophyll, thereby increasing light attenuation. A particularly large event occurred in the spring of 2000. Here, we assess the impact of the spring 2000 P. minimum bloom on habitat quality for submerged aquatic vegetation (SAV) in the mesohaline region of Chesapeake Bay and its tributaries, We determined the light absorption and scattering spectrum of P. minimum on a per cell basis by analyzing inherent optical properties of natural samples from the Rhode River, Maryland, which were overwhelmingly dominated by P. minimum. Using these per cell properties, we constructed a model of light penetration incorporating observed cell counts of P. minimum to predict the impact of the bloom on other tributaries and main stem locations that experienced the bloom. Model estimates of diffuse attenuation coefficients agreed well with the limited measurements that were available. Impacts of the mahogany tide on diffuse attenuation coefficient ranged from negligible (10-30% increase above the seasonal median in the Patapsco and Magothy rivers), to a greater than six-fold increase (Potomac River). Attenuation coefficients in tributaries to the north and south of the bloom region either decreased or were unchanged relative to seasonal medians. Segments with SAV losses in 2000 were mostly the same as those that experienced the P. minimum bloom. Segments north and south of the bloom area mostly had SAV increases in 2000. Though all of the segments that experienced a decline in SAV area after the spring 2000 bloom showed an increase in 2002, the 2000 setback interrupted what otherwise has been a slow recovery in mid-Bay SAV, demonstrating the adverse impact of P. minimum blooms on SAV populations in Chesapeake Bay.
机译：多年来，切萨皮克湾的上游一直反复出现极鞭毛最低原鞭毛的异常春季开花。尽管这些花朵在切萨皮克湾不被认为具有毒性，但它们产生的叶绿素浓度异常高，从而增加了光衰减。在2000年的春天发生了一个特别大的事件。在这里，我们评估了切萨皮克湾及其支流中淡水地区的2000 P.春季最低盛开对淹没水生植物（SAV）栖息地质量的影响，我们确定了光通过分析来自马里兰州罗德河的天然样品的固有光学特性，分析了最小的P.min吸收和散射光谱。使用这些每个单元格的属性，我们构建了一个光穿透模型，该模型结合了观察到的最小拟南芥细胞计数，以预测该开花对其他支流和经历该开花的主要茎部位的影响。扩散衰减系数的模型估计与可用的有限测量非常吻合。桃花心潮对弥散衰减系数的影响范围可忽略不计（在Patapsco和Magothy河流中，比季节性中值高出10-30％），到增大到六倍以上（波托马克河）。相对于季节性中值，位于盛开区域北部和南部的支流的衰减系数降低或保持不变。 2000年SAV损失的细分市场与经历P.最低开花的细分市场基本相同。 2000年盛花区以南和北部的部分SAV均增加。尽管2000年春季盛花后SAV面积下降的所有部分都在2002年有所增加，但2000年的挫折打断了原本缓慢恢复的2000年。海湾中部SAV，这表明切花小花对切萨皮克湾SAV种群的不利影响。

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