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Planktonic Ecosystems

机译：浮游生物生态系统

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Globally significant quantities of organic carbon are stored in northern permafrost soils, but little is known about how this carbon is processed by microbial communities once it enters rivers and is transported to the coastal Arctic Ocean. As part of the Arctic River-Delta Experiment (ARDEX), we measured environmental and microbiological variables along a 300 km transect in the Mackenzie River and coastal Beaufort Sea, in July-August 2004. Surface bacterial concentrations averaged 6.7 × 10~5 cells mL~(-1) with no significant differences between sampling zones. Picocyanobacteria were abundant in the river, and mostly observed as cell colonies. Their concentrations in the surface waters decreased across the salinity gradient, dropping from 51,000 (river) to 30 (sea) cells mL~(-1). There were accompanying shifts in protist community structure, from diatoms, cryp-tophytes, heterotrophic protists and chrysophytes in the river, to dinoflagellates, prymnesiophytes, chrysophytes, prasinophytes, diatoms and heterotrophic protists in the Beaufort Sea. Size-fractionated bacterial production, as measured by ~3H-leucine uptake, varied from 76 to 416 ng C L~(-1) h~(-1). The contribution of particle-attached bacteria (> 3μm fraction) to total bacterial production decreased from > 90% at the Mackenzie River stations to < 20% at an offshore marine site, and the relative importance of this particle-based fraction was inversely correlated with salinity and positively correlated with particulate organic carbon concentrations.
机译：在全球范围内，大量的有机碳存储在北部的多年冻土中，但是对于这种微生物一旦进入河流并被运送到北冰洋沿海，微生物群落如何处理该碳知之甚少。作为北极三角洲实验（ARDEX）的一部分，我们在2004年7月至8月的Mackenzie河和波弗特海沿岸的300公里横断面上测量了环境和微生物变量。平均表面细菌浓度为6.7×10〜5细胞mL 〜（-1），采样区之间无显着差异。河中的微蓝细菌丰富，主要观察到为细胞菌落。它们在地表水中的浓度沿盐度梯度下降，从51,000（河流）下降到30（海）细胞mL〜（-1）。生物的群落结构也随之发生变化，从河中的硅藻，催生植物，异养生物和金绿藻到波弗特海的鞭毛藻，早生植物，金藻，古生物，硅藻和异养生物。通过〜3H-亮氨酸的摄取来测量，细菌的大小分为76到416 ng C L〜（-1）h〜（-1）。附着在颗粒上的细菌（>3μm的部分）对细菌总产量的贡献从Mackenzie River站的> 90％降低到近海海洋站点的<20％，并且这种基于颗粒的部分的相对重要性与盐度与颗粒状有机碳浓度呈正相关。

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    《Oceanographic Literature Review》 |2009年第3期|583-584|共2页
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