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Preliminary investigation of Okhotsk Sea ice algae; taxonomic composition and photosynthetic activity

机译：鄂霍次克海冰藻的初步调查；分类学组成和光合活性

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摘要

Okhotsk Sea pack ice from Shiretoko in northern Hokkaido, sampled in March 2007, contained microalgal communities dominated by the centric diatoms Thalassiosira nordenskioeldi and T. punctigera. Domination by this genus is very unusual in sea ice. Communities from nearby fast ice at Saroma-ko lagoon were dominated by Detonula conferavea and Odontella aurita. Average microalgal biomass of the Okhotsk Sea pack ice (surface and bottom) was 1.59 ± 1.09 μg chla l~(-1) and for fast ice (bottom only) at nearby Saroma-ko lagoon, 16.5 ± 3.2 μg l~(-1) (= 31.1 ±5.0 mg chla m~(-2)). Maximum quantum yield of the Shiretoko pack ice algal communities was 0.618 ± 0.056 with species-specific data ranging between 0.211 and 0.653. These community values are amongst the highest recorded for sea ice algae. Rapid light curves (RLC) on individual cells indicated maximum relative electron transfer rates (relETR) between 20.8 and 60.6, photosynthetic efficiency values (a) between 0.31 and 0.93 and onset of saturation values (E_k) between 33 and 91 μmol photons m~(-2) s~(-1). These data imply that the pack ice algal community at Shiretoko was healthy and actively photosynthesising. Maximum quantum yield of the rnSaroma-ko fast ice community was 0.401 ± 0.086, with values for different species between 0.361 and 0.560. RLC data from individual Saroma-ko fast ice algal cells indicated relETR between 55.3 and 60.6, α values between 0.609 and 0.816 and E_k values between 74 and 91 photons m~(-2) s~(-1) which are consistent with measurem in previous years.
机译：来自北海道北部知床的鄂霍次克海冰块于2007年3月采样，其中包含以中硅藻Thalassiosira nordenskioeldi和T. punctigera为主的微藻类群落。在海冰中，这种属的控制是非常不寻常的。在萨洛玛湖泻湖附近的快速冰上的社区主要是Detonula conferavea和Odontella aurita。鄂霍次克海pack冰（表面和底部）的平均微藻生物量为1.59±1.09μgchla l〜（-1），而附近Saroma-ko泻湖的速冻冰（仅底部）为16.5±3.2μgl〜（-1） ）（= 31.1±5.0 mg chla m〜（-2））。 Shiretoko浮冰藻类群落的最大量子产率为0.618±0.056，特定物种的数据范围为0.211至0.653。这些社区价值是海冰藻记录的最高价值之一。单个电池上的快速光曲线（RLC）表示最大相对电子传递速率（relETR）在20.8至60.6之间，光合效率值（a）在0.31至0.93之间，饱和值（E_k）的出现在33至91μmol光子m〜（ -2）s〜（-1）。这些数据表明，知床的冰块藻类群落是健康的，并且正在积极地进行光合作用。 rnSaroma-ko快冰群落的最大量子产率为0.401±0.086，不同物种的数值在0.361至0.560之间。来自单个Saroma-ko快冰藻细胞的RLC数据表明relETR在55.3至60.6之间，α值在0.609至0.816之间，E_k值在74至91个光子m〜（-2）s〜（-1）中，与昔年。

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  • 来源
    《Polar biology》 |2008年第8期|1011-1015|共5页
  • 作者

    A. McMinn; H. Hattori; T. Hirawake; A. Iwamoto;

  • 作者单位

    Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Hobart, Private Bag 77, Tasmania, Australia;

    Hokkaido Tokai University, 5-1-1-1 Minamisawa, Minami-ku, Sapporo, Hokkaido, Japan;

    Laboratory of Marine Bioresourses and Environmental Sensing, Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato-cho, Hakodate, Hokkaido, Japan;

    Hokkaido Tokai University, 5-1-1-1 Minamisawa, Minami-ku, Sapporo, Hokkaido, Japan;

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  • 正文语种 eng
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  • 关键词

    okhotsk; sea ice algae; photosynthesis; saroma;

    机译：鄂霍次克海冰藻光合作用;肉瘤;

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