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Large seasonal variation in phytoplankton production in the Amundsen Sea

机译：阿蒙森海浮游植物产量的季节性大变化

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摘要

To better estimate annual primary production in the Amundsen Sea, which is one of the highest productivity regions in the Southern Ocean, the seasonal variations in carbon and nitrogen uptake rates of phytoplankton were investigated in this study. Based on ~(13)C-~(15)N dual isotope tracer techniques, the average daily productivities for the Amundsen polynya (AP), Pine Island polynya (PIP) and non-polynya regions were 0.25, 0.16 and 0.12 g C m~(-2) day~(-1), respectively. The average daily uptake rates of total nitrogen were 60.2, 53.5 and 34.8 mg N m~(-2) day~(-1) for the AP, PIP and non-polynya stations, respectively. In spite of the high concentration of nitrate in the Amundsen Sea, daily nitrate uptake rates (mean ± SD = 0.02 ± 0.01 g N m~(-2) day~(-2)) were lower than ammonium uptakes for all productivity stations in this study, which resulted in a significantly lower f-ratio (mean ± SD = 0.44 ± 0.24) than that (mean ± SD = 0.71 ± 0.15) of the previous year. The substantially lower uptake rates of carbon and nitrogen and the f-ratio, especially in the AP, are due to a large seasonal variation in the uptake rates mainly caused by the shorter daytime duration and partly due to lower light availability induced by deeper mixed conditions in the present study compared with the previous study in 2010/2011. The large seasonal variation in daily phytoplankton production should be considered to better estimate annual production as a basic food source for higher trophic levels in the Amundsen Sea.
机译：为了更好地估算作为南部大洋生产力最高地区之一的阿蒙森海的年度初级产量，本研究调查了浮游植物碳和氮吸收率的季节性变化。基于〜（13）C-〜（15）N双同位素示踪技术，Amundsen polynya（AP），Pine Island polynya（PIP）和非polynya地区的平均日生产力为0.25、0.16和0.12 g C m 〜（-2）天〜（-1）。 AP，PIP和非Polynya站的总氮平均日吸收率分别为60.2、53.5和34.8 mg N m〜（-2）day〜（-1）。尽管阿蒙森海中硝酸盐的浓度很高，但该地区所有生产力站的每日硝酸盐吸收速率（平均值±SD = 0.02±0.01 g N m〜（-2）天〜（-2））都低于铵吸收。这项研究的f值比率（平均值±SD = 0.44±0.24）明显低于上一年（平均值±SD = 0.71±0.15）。碳和氮的吸收率和f值的比率大大降低，尤其是在AP中，这是由于吸收率的季节性变化较大，这主要是由于白天持续时间较短，部分原因是由于更深的混合条件导致光利用率较低本研究与2010/2011年的先前研究相比。应考虑每日浮游植物产量的巨大季节性变化，以更好地估算年产量，作为阿蒙森海营养水平较高的基本食物来源。

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  • 来源
    《Polar biology》 |2015年第3期|319-331|共13页
  • 作者

    Bo Kyung Kim; HuiTae Joo; Ho Jung Song; Eun Jin Yang; Sang Hoon Lee; Doshik Hahm; Tae Siek Rhee; Sang H. Lee;

  • 作者单位

    Department of Oceanography, Pusan National University, 30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea;

    Department of Oceanography, Pusan National University, 30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea;

    Department of Oceanography, Pusan National University, 30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea;

    Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-840, Korea;

    Department of Oceanography, Pusan National University, 30, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Korea;

    Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-840, Korea;

    Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-840, Korea;

    Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 406-840, Korea;

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  • 关键词

    Phytoplankton productivity; Carbon and nitrogen; Polynya; Amundsen Sea; Antarctic;

    机译：浮游植物的生产力;碳和氮;波利尼亚阿蒙森海;南极;

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