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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal variability of plankton blooms in the Ria de Ferrol (NW Spain): Ⅰ. Nutrient concentrations and nitrogen uptake rates
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Seasonal variability of plankton blooms in the Ria de Ferrol (NW Spain): Ⅰ. Nutrient concentrations and nitrogen uptake rates

机译：Ria de Ferrol（西班牙西北部）浮游生物花期的季节性变化：Ⅰ。营养物浓度和氮吸收率

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The frequent plankton blooms in the Ria de Ferrol (Galicia, NW Spain) were analysed by measuring changes in dissolved nutrient concentrations and plankton uptake rates. Four cruises were made during February, May, July and September 2000 to study seasonal differences between blooms. Dissolved inorganic nutrients, oxygen, particulate and dissolved organic carbon and nitrogen, along with chlorophyll-a concentrations were measured in three selected stations representative of inner, middle and outer zones of the ria. In addition, gross uptake of nitrate and ammonium was estimated using ~(15)N-tracers. During February only there were no accumulations of phytoplankton inside the ria, despite the high concentration of nutrients. In contrast, large accumulations of phytoplankton were found during the other three cruises (up to 27.8 mg chlorophyll-a m~(-3) in September), when nutrient concentrations were much lower; however, inorganic nutrients were never exhausted in surface waters. Values of the inorganic nitrogen-to-phosphate ratio < 10 during blooms in the surface during spring and summer suggest that the nitrogen supply control bloom development. In this way, nitrate uptake dominated in February (mean ± SE, f-ratio = 0.76±0.01) and July (0.64±0.05), while ammonium uptake dominated in May (0.25 ± 0.07) and September (0.42 ± 0.05). Due to the low input of continental water during the study, nutrient dynamics and fluxes were largely dependent on shelf-ria exchanges and in situ regeneration, which helped to sustain a relatively large biomass of plankton in absence of direct effects of the coastal upwelling. The succession of phytoplankton blooms in the Ria de Ferrol produces a progressive transformation of nitrogen from inorganic to organic forms (both particulate and dissolved) from winter to late summer. Such accumulations of organic matter would maintain remineralisation rates matching plankton uptake, with the result of no net accumulation of inorganic nutrients inside the ria.
机译：通过测量溶解营养物浓度和浮游生物摄取率的变化，分析了Ria de Ferrol（西班牙西北加里西亚）的频繁浮游生物开花。 2000年2月，5月，7月和9月进行了四次巡游，以研究水华之间的季节性差异。在三个选定的代表ria内部，中间和外部区域的站点中测量了溶解的无机养分，氧，颗粒和溶解的有机碳和氮以及叶绿素a的浓度。另外，使用〜（15）N示踪剂估算了硝酸盐和铵的总摄入量。尽管养分含量很高，但在2月期间，ria内没有浮游植物的积累。相比之下，在其他三个巡游中发现了大量的浮游植物蓄积（9月份叶绿素-a m〜（-3）高达27.8 mg），此时营养物的浓度要低得多。但是，无机营养从未在地表水中耗尽。春季和夏季表面水华期间无机氮磷比值<10，表明氮供应控制水华发展。这样，2月（平均值±SE，f比率= 0.76±0.01）和7月（0.64±0.05）占主导地位，而5月（0.25±0.07）和9月（0.42±0.05）占主导地位。由于研究过程中大陆水的输入量低，养分的动态和通量主要取决于陆架交换和原位再生，这有助于在没有沿海上升流直接影响的情况下维持相对较大的浮游生物量。从冬季到夏末，Ria de Ferrol的一系列浮游植物水华使氮逐渐从无机形式转变为有机形式（颗粒形式和溶解形式）。这种有机物的积累将维持与浮游生物吸收相匹配的再矿化速率，其结果是在ria内没有净的无机养分积累。

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