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首页> 外文期刊>Deep-Sea Research >Probing natural iron fertilization near the Kerguelen (Southern Ocean) using natural phytoplankton assemblages and diatom cultures
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Probing natural iron fertilization near the Kerguelen (Southern Ocean) using natural phytoplankton assemblages and diatom cultures

机译：使用天然浮游植物组合和硅藻培养物探寻南海（Kerguelen）附近的天然铁肥

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Natural phytoplankton assemblages collected in surface waters above the Kerguelen Plateau or in the open-ocean and single-species cultures of Southern Ocean diatoms were used to address the existence and effects of natural iron fertilization near the Kerguelen Islands (Southern Ocean). The phytoplankton was transferred'during so-called translocation experiments into water collected at the surface over the Plateau, open-ocean surface water or water collected close to the sediment of the Plateau. These watertypes differed in iron (iron-rich deep water and iron-poor surface water) and silicic acid concentration (silicic acid-rich Plateau deep and open-ocean surface water, silicic acid-poor Plateau surface water). As a general trend in the natural phytoplankton assemblages, cell numbers, chlorophyll autofluorescence, photosynthetic efficiency of photosystem II, chlorophyll a and phytoplankton carbon concentrations increased especially after translocation into Plateau deep water. This response was most pronounced in terms of increase in carbon assimilation in the larger-sized phytoplankton ( > 8 μm in cell diameter), mainly diatoms. Effects of translocation on bacteria and viruses followed those of the phytoplankton. Experiments with single-species cultures of large diatoms (Fragilariopsis kerguelensis, Thalassiosira sp., Chaetoceros dichaeta), which have high iron requirements, confirmed the observations made for the natural phytoplankton assemblages. Assuming a continuous flux of deep water to the surface over the Kerguelen Plateau, the translocation experiments provide evidence that this water contains the growth-stimulating factor, most likely iron, responsible for the formation of a phytoplankton bloom as is observed over the Kerguelen Plateau.
机译：在Kerguelen高原以上的地表水或南大洋硅藻的开放式和单物种养殖中收集的天然浮游植物组合被用于解决Kerguelen群岛（南大洋）附近天然铁肥的存在和影响。在所谓的易位实验中，浮游植物被转移到高原表面收集的水，海洋表层水或高原沉积物附近收集的水。这些水类型在铁（富铁深水和贫铁地表水）和硅酸浓度（富硅酸高原深层和开阔海洋地表水，贫硅酸高原地表水）方面有所不同。作为天然浮游植物组合的总体趋势，细胞数量，叶绿素自发荧光，光系统II的光合作用效率，叶绿素a和浮游植物碳浓度增加，尤其是在转移到高原深水之后。就大型浮游植物（细胞直径> 8μm）中主要是硅藻的碳同化增加而言，这种反应最为明显。易位对细菌和病毒的影响紧随浮游植物。对铁含量较高的大型硅藻（Fragilariopsis kerguelensis，Thalasiosira sp。，Chaetoceros dichaeta）的单物种培养进行的实验证实了对天然浮游植物组合的观察。假设连续不断的深水流入克格伦高原上空，易位实验提供的证据表明，这种水含有生长刺激因子，很可能是铁，导致了克格伦高原上浮游植物的形成。

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