On the phenology and seeding potential of sea-ice microalgal species
On the phenology and seeding potential of sea-ice microalgal species
复制标题
海冰微藻物种的物候和播种潜力
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
J. Stefels
中科院分区：
文献类型：
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作者：
M. V. van Leeuwe;M. Fenton;Emily Davey;Janne;E. Jones;M. Meredith;J. Stefels
海冰是各种微藻物种的重要栖息地。根据物种组成，海冰可以是春季冰融化后浮游植物水华的播种源。2014年和2016年，在位于南极西部半岛（WAP）的罗瑟拉研究站对海冰藻类群落进行了2个完整冬季的研究。藻类色素模式和显微镜观察与基于荧光分析的植物生理学研究相结合，以监测和解释冰藻物种的物候。物种演替的明确模式被确定。年轻的海冰含有多种藻类，包括甲藻、隐藻和硅藻，如角毛藻。和拟脆杆藻属（Fragillariopsis spp.）在冬季，恶劣的环境条件导致物种多样性下降和选择向异养。羽状硅藻，如Amphiprora kufferathii和Berkeleya adeliensis是早春第一个统治富含营养的底部冰层的硅藻。底层群落的光适应参数Ek值非常稳定，约为25 µ mol光子m-2 s-1。而羽状硅藻是最丰富的春季冰，与冰融化的初始播种事件与鞭毛虫物种。附着植物种类如南极棕囊藻和腐植植物如塔单胞菌属。最好地维持了从海冰到海水的转变。与以往的研究比较表明，在莱德湾观察到的播种模式的特点，在更广泛的海冰域，北极和南极。在本世纪的过程中，WAP预计将经历持续变薄和海冰覆盖率下降。在不久的将来，我们预计，特别是微藻群落的附着植物和绿藻将受益于变化，但未知的影响碳通量和更高的营养水平。
Sea ice is an important habitat for a wide variety of microalgal species. Depending on the species composition, sea ice can be a seeding source for pelagic phytoplankton blooms after ice melt in spring. Sea-ice algal communities were studied over 2 full winter seasons in 2014 and 2016 at Rothera Research Station, situated at the Western Antarctic Peninsula (WAP). Algal pigment patterns and microscopic observations were combined with photophysiological studies based on fluorescence analyses to monitor and explain the phenology of ice-algal species. Clear patterns in species succession were identified. Young sea ice contained a mixture of algal species including dinoflagellates, cryptophytes and diatoms like Chaetoceros spp. and Fragillariopsis spp. In winter, severe environmental conditions resulted in a decline in species diversity and selection towards heterotrophy. Pennate diatoms like Amphiprora kufferathii and Berkeleya adeliensis were the first to dominate the nutrient-enriched bottom-ice layers in early spring. The bottom communities exhibited a remarkably stable value for the photoadaptation parameter, Ek, of circa 25 µmol photons m–2 s–1. Whereas pennate diatoms were most abundant in spring ice, the initial seeding event linked to ice melt was associated with flagellate species. Haptophyte species like Phaeocystis antarctica and prymnesiophytes like Pyramimonas spp. best sustained the transition from sea ice to seawater. Comparison with previous studies shows that the seeding patterns observed in Ryder Bay were characteristic over the wider sea-ice domain, Arctic and Antarctic. Over the course of this century, the WAP is predicted to experience continuing thinning and decline in sea-ice cover. For the near future, we expect that especially microalgal communities of haptophytes and chlorophytes will benefit from the changes, with yet unknown implications for carbon fluxes and higher trophic levels.
影响因子：
4.1
作者：
Henley, Sian F.;Schofield, Oscar M.;Meredith, Michael P.
通讯作者：
Meredith, Michael P.
从冬季到夏季南极陆地海冰的碳和营养物循环
影响因子：
4.5
作者：
Jones E
通讯作者：
Jones E