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首页> 外文期刊>Harmful Algae >Temporal variations in phytoplankton, particulates, and colored dissolved organic material based on optical properties during a Long Island brown tide compared to an adjacent embayment
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Temporal variations in phytoplankton, particulates, and colored dissolved organic material based on optical properties during a Long Island brown tide compared to an adjacent embayment

机译：基于长岛褐潮期间光学特性的浮游植物，微粒和有色溶解有机物的时空变化（与相邻的浮游物相比）

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Since 1985, the coastal embayments of Long Island, New York, have been plagued with recurrent blooms, aptly called brown tides, of the pelagophyte Aureococcus anophagefferens. The distinct ocean color observed during these blooms suggests that optical methods can be used as a tool to study, detect, and track brown tides. Thus, the goal of our project was to compare the optical properties and pigment composition during bloom and non-bloom conditions and assess temporal variations in the phytoplankton and other constituents in the seawater associated with bloom development. From 17 May to 8 June 2000, we measured a time series of particle size distributions and concentrations as well as size-fractioned algal pigments and optical properties in two Long Island embayments where brown tides are known to occur. During our study, A. anophagefferens represented an insignificant contribution to the algal community in West Neck Bay (WNB), whereas a bloom developed in Quantuck Bay (QB). Initially, temperature and salinity were similar at the two locations; however, bulk optical properties, chlorophyll, and particle concentrations were nearly a factor of 2 greater at QB. Bulk optical properties remained constant at WNB, yet increased exponentially at QB as the bloom developed. The composition of particulates, including phytoplankton, varied little at QB, and the optical properties suggested the dominance of A. anophagefferens (confirmed by microscopy). The largest temporal variations were observed in the colored dissolved organic material (CDOM); the colloidal (0.2-0.7 μm) fraction, exhibiting a strong protein-like signal, increased dramatically at the height of the bloom. At WNB particle sizes and algal composition varied despite the invariant bulk optical properties; CDOM variations were minimal. Overall, the optical properties in the two bays demonstrated that at QB temporal variations were dominated by biomass and colloidal protein changes, whereas shifts in the algal community occurred at WNB. This study demonstrates the utility of in situ optical observations to resolve temporal changes in the ecological conditions associated with algal bloom development.
机译：自1985年以来，纽约长岛的沿海港湾一直饱受象牙藻金黄色葡萄球菌的周期性开花（俗称棕潮）的困扰。在这些水华期间观察到的独特海洋颜色表明，光学方法可以用作研究，检测和跟踪潮汐的工具。因此，我们的项目目标是比较水华和非水华条件下的光学性质和色素成分，并评估浮游植物和海水中与水华发展相关的其他成分的时间变化。从2000年5月17日至6月8日，我们测量了两个已知长岛潮汐的长岛小海湾中粒度分布和浓度以及大小分级的藻类颜料和光学性质的时间序列。在我们的研究中，嗜藻按蚊对西颈湾（WNB）的藻类群落贡献不大，而在Quantuck湾（QB）则出现了水华。最初，这两个位置的温度和盐度相似。但是，在QB处，整体光学性能，叶绿素和颗粒浓度几乎增加了2倍。 WNB的本体光学性质保持不变，但随着光华的发展，其在QB呈指数增长。包括浮游植物在内的微粒组成在QB时变化不大，并且光学性质表明嗜藻曲霉占主导地位（通过显微镜确认）。在有色溶解有机材料（CDOM）中观察到最大的时间变化；胶体（0.2-0.7μm）的部分，显示出强的蛋白样信号，在水华的高度急剧增加。在WNB，尽管整体光学性质不变，但颗粒大小和藻类组成却有所不同。 CDOM的变化很小。总体而言，两个海湾的光学特性表明，在QB处，生物量和胶体蛋白的变化主导着时间的变化，而WNB处的藻类群落发生了变化。这项研究证明了原位光学观测在解决与藻华发展相关的生态条件中的时间变化方面的实用性。

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