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Baltic Sea diazotrophic cyanobacterium is negatively affected by acidification and warming

机译：波罗的海重氮蓝藻受到酸化和变暖的负面影响

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摘要

Nitrogen fixation is a key source of nitrogen in the Baltic Sea which counteracts nitrogen loss processes in the deep anoxic basins. Laboratory and field studies have indicated that single-strain nitrogen-fixing (diazotrophic) cyanobacteria from the Baltic Sea are sensitive to ocean acidification and warming, 2 drivers of marked future change in the marine environment. Here, we enclosed a natural plankton community in 12 indoor mesocosms (volume ~1400 l) and manipulated partial pressure of carbon dioxide (pCO2) in seawater to yield 6 CO2 treatments with 2 different temperature treatments (16.6?°C and 22.4?°C, pCO2 range = 360-2030 ?μatm). We followed the filamentous, heterocystous diazotrophic cyanobacteria community (Nostocales, primarily Nodularia spumigena) over 4 wk. Our results indicate that heterocystous diazotrophic cyanobacteria may become less competitive in natural plankton communities under ocean acidification. Elevated CO2 had a negative impact on Nodularia sp. biomass, which was exacerbated by warming. Our results imply that Nodularia sp. may contribute less to new nitrogen inputs in the Baltic Sea in the future.
机译：固氮是波罗的海的主要氮源，可抵消深部缺氧盆地的氮损失过程。实验室和现场研究表明，来自波罗的海的单株固氮（固氮营养型）蓝细菌对海洋酸化和变暖敏感，这是海洋环境未来显着变化的两个驱动因素。在这里，我们将天然的浮游生物群落封闭在12个室内中尺度（体积约1400 l）中，并控制海水中二氧化碳的分压（pCO2），以产生6种CO2处理，并采用2种不同的温度处理方式（16.6？C和22.4？C）。 ，pCO2范围= 360-2030？atm。我们在超过4周的时间内追踪了丝状，异囊性重氮营养蓝藻群落（Nostocales，主要是Spodgena结节藻）。我们的结果表明，在海洋酸化作用下，异质重氮营养蓝细菌在天然浮游生物群落中的竞争力可能降低。二氧化碳浓度升高对结节菌具有负面影响。生物质，由于升温而加剧。我们的结果表明结节藻属。将来可能会减少对波罗的海新氮投入的贡献。

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