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Sea surface phytoplankton community response to nutrient and light changes

机译：海面浮游植物群落对营养和光线变化的反应

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The sea surface microlayer (SML) is the boundary layer between the ocean and the atmosphere and plays a unique role in marine biogeochemistry. Phytoplankton communities in this uppermost surface layer are exposed to extreme ultraviolet (UV) radiation and potentially high nutrient supplies. In order to understand the response of SML communities to such contrasting conditions, we conducted experiments at three different sites, the North Sea (open ocean) and two sites, outer and middle fjord, in the Sognefjord, Norway, with differing physical and chemical parameters. We manipulated light, nitrogen (N) and phosphorus (P) supply to natural communities collected from the SML and compared their response to that of the underlying water (ULW) communities at 1-m depth. Phytoplankton communities in both SML and ULW responded significantly to N addition, suggesting the upper 1-m surface phytoplankton communities were N-limited. While phytoplankton growth rates were higher with high N and high light supply, biomass yield was higher under low light conditions and with a combined N and P supply. Furthermore, biomass yield was generally higher in the ULW communities compared to SML communities. Nutrient and light effects on phytoplankton growth rates, particulate organic carbon (POC) and stoichiometry varied with geographical location. Phytoplankton growth rates in both SML and ULW at the open ocean station, the site with highest salinity, did not respond to light changes, whereas the communities in the middle fjord, characterized by high turbidity and low salinity, did experience light limitation. This work on the upper surface phytoplankton communities provides new insights into possible effects of coastal darkening and increases understanding of oceanic biogeochemical cycling.
机译：海面微层（SML）是海洋和大气之间的边界层，在海洋生物绿化学中起着独特作用。该最大表面层中的Phytoplankton群落暴露于极端紫外（UV）辐射和潜在的高营养供应。为了了解SML社区对这种对比条件的响应，我们在挪威Sognefjord的三个不同地点，北海（开阔的海洋）和两个地点，外部和中峡湾进行了实验，具有不同的物理和化学参数。我们操纵从SML收集的天然社区的光，氮（N）和磷（P）供应，并将其对1M深度的底层水（ULW）群落的反应进行比较。 SML和ULW中的Phytoplankton群落显着反应N添加，表明1米表面浮游植物社区是N-Limited。虽然浮游植物的生长率高N和高光源，但低光条件下的生物质产率较高，并且N和P供应组合。此外，与SML社区相比，ULW社区的生物质产量通常在乌尔群落中较高。植物和光线效应对浮游植物生长速率，颗粒状有机碳（POC）和化学计量变化，地理位置。浮游植物在开放的海洋站的SML和ULW中的增长率，盐度最高的遗址没有反应光线变化，而中间峡湾的社区，以高浊度和低盐度为特征，确实经历了光限制。这项工作在上面浮游植物社区对沿海变暗的可能影响并提高了对海洋生物地球化学循环的可能性提供了新的洞察力。

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  • 来源
    《Marine biology》 |2020年第9期|123.1-123.15|共15页
  • 作者

    Mustaffa Nur Ili Hamizah; Kallajoki Liisa; Hillebrand Helmut; Wurl Oliver; Striebel Maren;

  • 作者单位

    Carl Von Ossietzky Univ Oldenburg Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany;

    Carl Von Ossietzky Univ Oldenburg Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany;

    Carl Von Ossietzky Univ Oldenburg Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany|Univ Oldenburg HIFMB Helmholtz Inst Funct Marine Biodivers Ammerlander Heerstr 231 D-26129 Oldenburg Germany|Helmholtz Ctr Polar & Marine Res AWI Alfred Wegener Inst Handelshafen 12 D-27570 Bremerhaven Germany;

    Carl Von Ossietzky Univ Oldenburg Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany|Carl Von Ossietzky Univ Oldenburg Ctr Marine Sensors Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany;

    Carl Von Ossietzky Univ Oldenburg Inst Chem & Biol Marine Environm Schleusenstr 1 D-26382 Wilhelmshaven Germany;

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