Ocean acidification with (de)eutrophication will alter future phytoplankton growth and succession.

Ocean acidification with (de)eutrophication will alter future phytoplankton growth and succession.
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DOI:
10.1098/rspb.2014.2604
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发表时间:
2015-04-07
期刊:
Proceedings. Biological sciences
影响因子:
--
通讯作者:
Brownlee C
Brownlee C
中科院分区:
其他
文献类型:
--
作者:
Flynn KJ;Clark DR;Mitra A;Fabian H;Hansen PJ;Glibert PM;Wheeler GL;Stoecker DK;Blackford JC;Brownlee C

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人类活动通过将人为产生的二氧化碳溶解到海水中而导致海洋酸化,并通过添加无机营养物质导致富营养化。富营养化增加了水华期间可以支持的浮游植物生物量,在光合作用过程中对溶解的无机碳的吸收增加了水柱的pH(水华诱导的碱化)。这种升高的pH值会对浮游生物的生长产生不利影响。对于OA,碱化在较低的pH下开始。通过对不同pH情景下三种不同浮游植物生长的实验分析,结合描述生长和死亡作为pH和营养状态的函数的数学模型,我们展示了不同的pH条件如何改变浮游植物物种之间竞争相互作用的范围。然后,我们使用先前针对实验数据配置的模型来探索在较低pH和OA的情况下开始水华诱导的碱化,并在营养负荷模式变化的背景下操作,可能会改变浮游植物的生长和竞争。我们的结论是,在富营养化或非富营养化(后者是由于污染控制)的情况下,将营养物质供应改变为陆架海,显然有可能改变浮游植物的演替,从而影响未来的营养动态,并对生物地球化学循环和渔业产生影响。
Human activity causes ocean acidification (OA) though the dissolution of anthropogenically generated CO2 into seawater, and eutrophication through the addition of inorganic nutrients. Eutrophication increases the phytoplankton biomass that can be supported during a bloom, and the resultant uptake of dissolved inorganic carbon during photosynthesis increases water-column pH (bloom-induced basification). This increased pH can adversely affect plankton growth. With OA, basification commences at a lower pH. Using experimental analyses of the growth of three contrasting phytoplankton under different pH scenarios, coupled with mathematical models describing growth and death as functions of pH and nutrient status, we show how different conditions of pH modify the scope for competitive interactions between phytoplankton species. We then use the models previously configured against experimental data to explore how the commencement of bloom-induced basification at lower pH with OA, and operating against a background of changing patterns in nutrient loads, may modify phytoplankton growth and competition. We conclude that OA and changed nutrient supply into shelf seas with eutrophication or de-eutrophication (the latter owing to pollution control) has clear scope to alter phytoplankton succession, thus affecting future trophic dynamics and impacting both biogeochemical cycling and fisheries.
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