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Key Arctic phototrophs are widespread in the polar night

机译：北极的主要营养生物在极地之夜很普遍

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摘要

Small photosynthetic pico- and nanoeukaryotes contribute substantially to the biomass and primary production in the Arctic, often producing large blooms during spring and summer. During the civil polar night, which in the Svalbard Archipelago lasts from the middle of November to the end of February, no light is present, thus providing photosynthetic organisms with the challenge of how to survive several months of darkness. The small green alga Mi-cromonas pusilla and the haptophyte Phaeocystis pouchetii are two key phototrophs in the Arctic, commonly blooming during the arctic spring and summer. Their occurence in Arctic waters during the polar night period is, however, less well known. In the present study, we used a molecular approach to show that M. pusilla and P. pouchetii are widely distributed in Svalbard waters also at the height of the polar night. Both species were detected in pelagic samples from both fjords and the open ocean, ice-covered and ice-free locations, shallow and deep water and from Atlantic, Arctic and coastal water masses. PCR screening was performed on both DNA and RNA samples, the latter allowing the detection of viable cells of both species in the mesopelagos. As far as we are aware this is the first systematic study on the persistence of these important photosynthetic organisms through the polar night.
机译：小型光合作用的微型真核生物和纳米真核生物对北极地区的生物量和初级生产有重大贡献，通常在春季和夏季产生大量水华。在斯瓦尔巴群岛的十一月中旬至二月底的民间极地之夜中，没有光照，因此给光合生物带来了如何在黑暗中生存数月的挑战。小绿藻微克罗莫纳斯小孢子和触藻植物Phaeocystis pouchetii是北极的两个主要光养生物，通常在春季和夏季开花。然而，它们在极夜期间在北极水域中的发生鲜为人知。在本研究中，我们使用分子方法显示了M. pusilla和P. pouchetii在极地夜晚的高度也广泛分布在斯瓦尔巴特水域中。在峡湾和公海，冰雪覆盖和无冰地区，浅水区和深水区以及大西洋，北极和沿海水域的浮游样本中都检测到了这两种物种。对DNA和RNA样品都进行了PCR筛选，后者可以检测中膜的两种物种的活细胞。据我们所知，这是对这些重要的光合生物在极夜期间的持久性的首次系统研究。

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