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首页> 外文期刊>Harmful Algae >Pico- and nanoplankton dynamics during bloom initiation of Aureococcus in a Long Island, NY bay
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Pico- and nanoplankton dynamics during bloom initiation of Aureococcus in a Long Island, NY bay

机译：纽约州长岛金黄色葡萄球菌开花开始期间的皮层和纳米浮游生物动力学

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The entire microbial plankton community was quantified on a weekly basis April through June of 2000 in Quantuck Bay as part of an ongoing study to identify factors contributing to the initiation of blooms of Aureococcus anophagefferens (brown tide) in Long Island, NY bays. We used flow cytometry, imaging cytometry, fluorescent antibody cell counts, and traditional visual cell counting to quantify the picophytoplankton, heterotrophic bacteria, nanophytoplankton, heterotrophic protists, and microplankton prior to, and during the initiation of a brown tide bloom. Cells passing through a 5 μm mesh dominated the total chlorophyll concentration ( >80%) for most of the spring study period. The A. anophagefferens bloom occurred in the context of a larger picoanophytoplankton bloom where A. anophagefferens accounted for only 30% of the total cell count when it was at its maximum concentration of 4.8 x 10~5 mL~(-1). Levels of dissolved organic nitrogen were enriched during the bloom peak relative to pre-bloom levels and heterotrophic bacteria also bloomed, reaching abundances over 10~7 mL~(-1). A trophic cascade within the heterotrophic protist community may have occurred, coinciding with the A. anophagefferens bloom. Before the onset of the bloom, larger grazers increased in abundance, while the next smaller trophic level of grazers were diminished. These smaller grazers were the likely water column predators of A. anophagefferens, and the brown tide bloom initiated when they were depleted. These results suggest that this bloom initiated due to interactions with other picoano algae and release from grazing pressure through a trophic cascade.
机译：作为一项正在进行的研究的一部分，整个微生物浮游生物群落在2000年4月至2000年6月之间每周进行定量，以鉴定有助于引发纽约湾长岛海湾嗜藻性金黄色葡萄球菌（褐潮）爆发的因素。我们使用流式细胞仪，成像细胞仪，荧光抗体细胞计数和传统的可视细胞计数来量化潮汐爆发之前和期间，浮游植物，异养细菌，纳米浮游植物，异养原生生物和微浮游生物。在春季研究的大部分时间里，通过5μm筛孔的细胞占总叶绿素浓度（> 80％）的水平。嗜藻曲霉的开花发生在较大的皮氏/浮游植物绽放的环境中，其中最大浓度为4.8 x 10〜5 mL〜（-1）时，嗜藻曲霉仅占总细胞数的30％。相对于开花前的水平，在开花高峰期溶解的有机氮水平富集，异养细菌也开花，其丰度超过10〜7 mL〜（-1）。在异养原生生物群落中可能发生了营养级联反应，这与嗜食曲霉的开花相吻合。在开花开始之前，较大的放牧者大量增加，而下一个较小的放牧者营养水平降低。这些较小的放牧者可能是嗜食按蚊的水柱掠食者，当它们枯竭时便会引发褐潮。这些结果表明，该开花是由于与其他皮卡/纳米藻的相互作用而引发的，并通过营养级联从放牧压力释放。

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