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Effects of CO2 concentration on a late summer surface sea ice community

机译：二氧化碳浓度对夏末表层海冰群落的影响

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摘要

Annual fast ice at Scott Base (Antarctica) in late summer contained a high biomass surface community of mixed phytoflagellates, dominated by the dinoflagellate, Polarella glacialis. At this time of the year, ice temperatures rise close to melting point and salinities drop to less than 20. At the same time, pH levels can rise above 9 and nutrients can become limiting. In January 2014, the sea ice microbial community from the top 30 cm of the ice was exposed to a gradient of pH and CO2 (5 treatments) that ranged from 8.87 to 7.12 and 5-215 mu mol CO2 kg(-1), respectively, and incubated in situ. While growth rates were reduced at the highest and lowest pH, the differences were not significant. Likewise, there were no significant differences in maximum quantum yield of PSII (F-v/F-m) or relative maximum electron transfer rates (rETR(max)) among treatments. In a parallel experiment, a CO2 gradient of 26-230 mu mol CO2 kg(-1) (5 treatments) was tested, keeping pH constant. In this experiment, growth rates increased by approximately 40% with increasing CO2, although differences among treatments were not significant.. As in the previous experiment, there was no significant response in F-v/F-m or rETR(max). A synchronous grazing dilution experiment found grazing rates to be inconclusive These results suggest that the summer sea ice brine communities were not limited by in situ CO2 concentrations and were not adversely affected by pH values down to 7.1.
机译：夏末的南极斯科特基地（Scott Base）的年度速冻冰含有高生物量的混合植物鞭毛藻表面群落，其中以鞭毛藻（Polaella glacialis）为优势。在一年中的这个时候，冰温上升到接近熔点，盐度下降到20以下。同时，pH值可能会上升到9以上，营养物质也会变得有限。 2014年1月，来自冰顶30 cm的海冰微生物群落暴露于pH值和CO2梯度（5种处理），分别介于8.87至7.12和5-215μmol CO2 kg（-1）之间。 ，并原位孵育。虽然在最高和最低pH值下生长速率都会降低，但差异并不明显。同样，各处理之间PSII的最大量子产率（F-v / F-m）或相对最大电子传递速率（rETR（max））也没有显着差异。在平行实验中，测试了26-230μmol CO2 kg（-1）的CO2梯度（5个处理），保持pH恒定。在该实验中，虽然各处理之间的差异并不显着，但随着CO2的增加，增长率大约增加了40％。与之前的实验一样，F-v / F-m或rETR（max）没有明显的反应。同步放牧稀释实验发现放牧速率没有定论。这些结果表明，夏季海冰盐水群落不受原地CO2浓度的限制，并且不受pH值低至7.1的不利影响。

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  • 来源
    《Marine biology》 |2017年第4期|87.1-87.10|共10页
  • 作者

    McMinn Andrew; Mueller Marius N.; Martin Andrew; Ugalde Sarah C.; Lee Shihong; Castrisios Katerina; Ryan Ken G.;

  • 作者单位

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia;

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia|Univ Sao Paulo IO USP, Oceanog Inst, Praca Oceanografico 191, BR-05508120 Sao Paulo, SP, Brazil;

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia;

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia;

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia;

    Univ Tasmania, Inst Marine & Antarct Studies, Private Bag 129, Hobart, Tas 7001, Australia;

    Victoria Univ Wellington, Sch Biol Sci, Wellington, New Zealand;

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  • 正文语种 eng
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  • 关键词

    Sea ice algae; CO2; pH; Summer; Brine; Antarctica;

    机译：海冰藻;CO2;pH;夏季;盐水;南极洲;

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