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Factors controlling phytoplankton physiological state around the South Shetland Islands (Antarctica)

机译：控制南设得兰群岛（南极洲）周围浮游植物生理状态的因素

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摘要

To investigate factors controlling phytoplankton physiological state around the South Shetland Islands, phytoplankton abundance and structure, fluorescence properties, photo-protective pigment composition and physicochemical variables were studied. Nanophytoplank-tonic cells (＜ 20 μm) contributed 84 % of total chlorophyll a (chl a), except for the station closest to the Antarctic Peninsula where microplanktonic cells (＞20 μm) predominated (up to 85% of total chl a). Daily irradiance over the mixed layer depth (MLD) was inversely related with integrated nanoplanktonic chl a; however, its relative contribution to total chl a increased at mid-irradiance values. The average maximum quantum yield of photosystem Ⅱ (F_v/F_m) below 20 m depth ranged from 0.17 to 0.53 and showed that cells were under suboptimal physiological conditions in the Drake region, but had higher performance around the South Shetland Islands and towards the Antarctic Peninsula. A reverse pattern in the fluorescence yield was detected. A deeper examination of the F_v/F_m vertical profiles according to the sampling time detected surface photoinhibi-tion during the day and a spatial modulation of F_v/F_m related to irradiance and the silicic acid:nitrate ratio. It appears that cells' photosynthetic performance was controlled by iron limitation in the Drake region, whereas irradiance regime controlled phytoplankton physiological state in the rest of the studied regions. Vertical mixing differences among stations, the relative position of the euphotic layer depth with respect to the MLD and the photoprotective pigment ratios revealed contrasting responses to light stress among the different phytoplanktonic groups, revealing a better adaptation of medium size cells, especially diatoms, to stratified waters receiving high irradiance.
机译：为了研究控制南设得兰群岛周围浮游植物生理状态的因素，研究了浮游植物的丰度和结构，荧光性质，光保护性色素成分和理化变量。纳米浮游植物细胞（＜20μm）贡献了总叶绿素a（chl a）的84％，除了最靠近南极半岛的站外，微浮游细胞（＞ 20μm）占主导地位（最多占总chl a的85％）。混合层深度（MLD）上的日照度与集成纳米浮游力chla呈负相关；然而，在中等辐照度值下，其对总chl a的相对贡献增加了。深度小于20 m的光系统Ⅱ的平均最大量子产量（F_v / F_m）在0.17至0.53之间，这表明德雷克地区的细胞处于次优生理条件下，但在南设得兰群岛和南极半岛的细胞具有更高的性能。 。检测到荧光产率的反向模式。根据在白天检测到的表面光抑制的采样时间以及与辐照度和硅酸：硝酸根比有关的F_v / F_m的空间调制，对F_v / F_m垂直轮廓进行更深入的检查。似乎在德雷克地区，细胞的光合性能受到铁限制的控制，而在其余研究区域中，辐照制度则控制了浮游植物的生理状态。站之间的垂直混合差异，相对于MLD的共沸层深度的相对位置以及光保护性色素比率显示了不同浮游植物基团对光胁迫的对比响应，表明中等大小的细胞（尤其是硅藻）更好地适应了分层接受高辐照度的水域。

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  • 来源
    《Marine ecology progress series》 |2014年第17期|55-71|共17页
  • 作者

    Cristina Garcia-Munoz; Cristina Sobrino; Luis M. Lubian; Carlos M. Garcia; Sandra Martinez-Garcia; Pablo Sangra;

  • 作者单位

    Departamento de Ecologia y Gestion costera, Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC),11510 Puerto Real, Cadiz, Spain;

    Departamento de Ecoloxia e Bioloxia Animal, Universidade de Vigo, 36200 Vigo, Pontevedra, Spain;

    Departamento de Ecologia y Gestion costera, Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC),11510 Puerto Real, Cadiz, Spain;

    Departamento de Biologia, Facultad de Ciencias del Mar y Ambientales, Universidad de Cadiz, 11510 Puerto Real, Cadiz, Spain;

    Departamento de Ecoloxia e Bioloxia Animal, Universidade de Vigo, 36200 Vigo, Pontevedra, Spain,C-MORE, University of Hawaii, C-MORE Hale, 1950 East West Road, Honolulu, Hawaii 96822, USA;

    Departamento de Fisica, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, 35017 Las Palmas de Gran Canaria, Spain;

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  • 正文语种 eng
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  • 关键词

    South Shetland Islands; Phytoplankton; F_v/F_m; Irradiance; Size; Mixed layer; Nutrients;

    机译：南设得兰群岛;浮游植物;F_v / F_m;辐照度尺寸;混合层营养素;

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