Control of Antarctic phytoplankton community composition and standing stock by light availability
Control of Antarctic phytoplankton community composition and standing stock by light availability
复制标题
通过光照控制南极浮游植物群落组成和现存量
DOI：
10.1007/s00300-022-03094-5
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发表时间：
2022
期刊：
影响因子：
1.7
通讯作者：
Biggs T
中科院分区：
文献类型：
--
作者：
Biggs T
南大洋的浮游植物特别容易受到明显的季节和年际光供应变化的影响。虽然以前的研究已经检查了光在这些环境中的作用，但很少将基于色素的分类与流式细胞术结合起来更好地区分各种浮游植物群的光反应。特别是硅藻的多样性和重要分类群内的不同种群需要进一步调查。在主要生育期，利用南极半岛西部采集的天然海水进行了6次孵育实验（9-10天）。褐囊藻的常备库存。在低、中、高、4-7、30-50和150-200µmol量子m−2s−1的所有光照水平下，细胞的积累速度相对较快，而小硅藻和大硅藻群体（直径4.5和20µm）在中、强光条件下的积累速度较快。相比之下，中等大小的硅藻（直径11.5µm）在弱光条件下净生长最快，随后在浮游植物群落中占据主导地位。弱光是限制浮游植物积累和生物量峰值的关键因素，但有一个孵育在弱光条件下具有较高的积累速率。实验前3周的弱光期可能允许适应最大化可实现的生长，并且似乎是不同的南极天然浮游植物种群是否维持，繁荣或下降的一个强有力的决定因素。我们的研究对光强度如何调节主要南极浮游植物的净响应提供了更好的见解，无论是在分类群之间还是在分类群内部。
Southern Ocean phytoplankton are especially subjected to pronounced seasonal and interannual changes in light availability. Although previous studies have examined the role of light in these environments, very few combined pigment-based taxonomy with flow cytometry to better discriminate the light response of various phytoplankton groups. In particular the different populations within the diverse and important taxonomic group of diatoms require further investigation. Six incubation experiments (9–10 days) were performed during the main productive period with natural seawater collected at the Western Antarctic Peninsula. Standing stock ofPhaeocystisspp. cells displayed relatively fast accumulation under all levels of light (low, medium, high; 4–7, 30–50 and 150–200 µmol quanta m−2s−1), whilst the small- and larger-sized diatom populations (4.5 and 20 µm diameter) exhibited faster accumulation in medium and high light. In contrast, intermediate-sized diatoms (11.5 µm diameter) displayed fastest net growth under low light, subsequently dominating the phytoplankton community. Low light was a key factor limiting accumulation and peak phytoplankton biomass, except one incubation displaying relatively high accumulation rates under low light. The 3-week low-light period prior to experimentation likely allowed adaptation to maximize achievable growth and seems a strong determinant of whether the different natural Antarctic phytoplankton populations sustain, thrive or decline. Our study provides improved insight into how light intensity modulates the net response of key Antarctic phytoplankton, both between and within taxonomic groups.
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