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首页> 外文期刊>Estuarine Coastal and Shelf Science >Short-term Under-ice Variability Of Prokaryotic Plankton Communities In Coastal Antarctic Waters (cape Hallett, Ross Sea)
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Short-term Under-ice Variability Of Prokaryotic Plankton Communities In Coastal Antarctic Waters (cape Hallett, Ross Sea)

机译：南极沿海水域原核浮游生物群落的短期冰下变异（海角哈雷特角，罗斯海）

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摘要

During the 2006 Italian Antarctic expedition a diel sampling was performed close to Cape Hallett (Ross Sea) during the Austral summer. Under-ice seawater samples (～4 m) were collected every 2 h for 28 h in order to estimate prokaryotic processes' variability and community structure dynamics. Prokaryotic and viral abundances, exoenzymatic activities (β-glucosidase, chitinase, lipase, alkaline phosphatase and leucine aminopeptidase), prokaryotic carbon production (~3H-leucine incorporation) and community structure (Denaturing Gradient Gel Electrophoresis - DGGE fingerprints) were analysed. Results showed that the diel variability of the prokaryotic activity followed a variation in salinity, probably as a consequence of the periodical thawing of sea ice (driven by solar radiation and air temperature cycles), while negligible variation in viral and prokaryotic abundances occurred. The Bacterial and Archaeal community structures underwent an Operational Taxonomic Units (OTUs) temporal shift from the beginning to the end of the sampling, while Flavobacreria-specific primers highlighted high variations in this group possibly related to sea ice melting and substrate release.
机译：在2006年的意大利南极探险队中，在夏季期间，在哈雷特角（罗斯海）附近进行了diel采样。每2小时收集一次冰下海水样本（〜4 m），持续28 h，以估计原核生物过程的变异性和群落结构动态。分析了原核和病毒的丰度，外酶活性（β-葡萄糖苷酶，几丁质酶，脂肪酶，碱性磷酸酶和亮氨酸氨基肽酶），原核碳产量（〜3H-亮氨酸掺入）和群落结构（变性梯度凝胶电泳-DGGE指纹图谱）。结果表明，原核生物活性的狄尔变异性随盐度变化而变化，这可能是由于海冰的周期性融化（受太阳辐射和气温循环驱动）而引起的，而病毒和原核生物丰度的变化可忽略不计。从采样开始到结束，细菌和古细菌群落结构经历了操作分类单位（OTUs）的时间变化，而黄杆菌特异性引物突出显示了该组中的高度变异，可能与海冰融化和底物释放有关。

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