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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Contrasted sensitivity of DMSP production to high light exposure in two Arctic under-ice blooms
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Contrasted sensitivity of DMSP production to high light exposure in two Arctic under-ice blooms

机译：两种北极冰下大花DMSP生产对高光照的敏感性不同

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In polar regions, low-light acclimated phytoplankton thriving under sea ice may be suddenly exposed to high irradiance when ice pack breaks or surface currents carry them into adjacent ice-free areas. Here we experimentally determined how rapid shifts in light regime affect the phytoplankton and the production of dimethylsulfoniopropionate (DMSP), an algal compound with antioxidant properties. Springtime experiments were carried out on under-ice phytoplankton blooms that exhibited different taxonomic assemblages in 2010 and 2011 within the Canadian Arctic Archipelago. Phytoplankton samples collected under-ice were incubated for 24 h or less on the ice at irradiances mimicking what they would experience in an ice-free upper mixed layer. We observed contrasting responses between the two years. In 2010, exposure of the under-ice centric diatom bloom to high irradiance consistently resulted in a rapid chlorophyll a decrease accompanied by a quasi-total release of the intracellular DMSP. In 2011, only the first experiment conducted with a low biomass flagellate-dominated assemblage resulted in a similar response. During the subsequent under-ice pennate diatom bloom, neither a chlorophyll a decrease nor a consistent increase in dissolved DMSP concentrations were observed during the experiments. The results demonstrate that the response of under-ice phytoplankton to the irradiance prevailing in ice-free water may vary depending on the developmental stage and taxonomic composition of the under-ice bloom. The rapid chlorophyll a decrease during the centric diatom bloom in 2010 and the associated DMSP exudation may potentially lead to a significant increase in DMS production via the microbial pathway at the ice edge. (C) 2015 Elsevier B.V. All rights reserved.
机译：在极地地区，当冰袋破裂或表面水流将其带入相邻的无冰区域时，在海冰下繁华的低光照适应性浮游植物可能会突然暴露在高辐照度下。在这里，我们通过实验确定了光照状态的快速变化如何影响浮游植物和具有抗氧化特性的藻类化合物二甲基磺丙酸二甲酯（DMSP）的产生。春季实验是在2010年和2011年在加拿大北极群岛内表现出不同分类组合的冰下浮游植物大花进行的。在冰底收集的浮游植物样品在冰上孵育24小时或更短时间，其辐照度类似于在无冰的上层混合层中所经历的辐照度。我们观察到这两年之间的反应截然不同。在2010年，以高辐照度暴露于冰下的中心硅藻水华持续导致叶绿素快速下降，并伴随着细胞内DMSP的准完全释放。在2011年，只有第一个以低生物量鞭毛为主的组合进行的实验得到了类似的响应。在随后的冰下戊二烯硅藻开花期间，在实验过程中未观察到叶绿素a的减少或溶解DMSP浓度的持续增加。结果表明，冰底浮游植物对无冰水中普遍存在的辐照度的响应可能会有所不同，具体取决于冰底水华的发育阶段和分类学组成。 2010年中心硅藻开花期间叶绿素a的快速减少以及相关的DMSP渗出可能通过冰缘的微生物途径导致DMS产量的显着增加。 （C）2015 Elsevier B.V.保留所有权利。

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