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Organic carbon and mineral nutrient limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea

机译：挪威海中有机碳和矿物质营养素对氧气消耗，细菌生长和效率的限制

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摘要

To evaluate the role of bacteria in the transformation of organic matter in subarctic waters, we investigated the effect of mineral nutrients (ammonia and phosphate) and organic carbon (glucose) enrichment on heterotrophic bacterial processes and community structure. Eight experiments were done in the Norwegian Sea during May and June 2008. The growth-limiting factor (carbon or mineral nutrient) for heterotrophic bacteria was inferred from the combination of nutrient additions that stimulated highest bacterial oxygen consumption, biomass, production, growth rate and bacterial efficiency. We conclude that heterotrophic bacteria were limited by organic carbon and co-limited by mineral nutrients during the prevailing early nano-phytoplankton (1-10μm) bloom conditions. High nucleic acid (HNA) bacteria became dominant (>80%) only when labile carbon and mineral nutrient sources were available. Changes in bacterial community structure were investigated using denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction (PCR)-amplified 16S ribosomal RNA genes. The bacterial community structure changed during incubation time, but neither carbon nor mineral nutrient amendment induced changes at the end of the experiments. The lack of labile organic carbon and the availability of mineral nutrients are key factors controlling bacterial activity and the role of the microbial food web in carbon sequestration.
机译：为了评估细菌在北极水下水体中有机物转化中的作用，我们调查了矿质养分（氨和磷酸盐）和有机碳（葡萄糖）富集对异养细菌过程和群落结构的影响。 2008年5月至6月在挪威海进行了八项实验。从营养添加的组合中推断出异养细菌的生长限制因子（碳或矿物质养分）可以刺激最高的细菌耗氧量，生物量，产量，生长速率和最大养分。细菌效率。我们得出的结论是，在当前的早期纳米浮游植物（1-10μm）开花条件下，异养细菌受到有机碳的限制，同时也受到矿物质养分的共同限制。仅当可获得不稳定的碳和矿物质营养源时，高核酸（HNA）细菌才占主导地位（> 80％）。使用变性梯度凝胶电泳（DGGE）聚合酶链反应（PCR）扩增的16S核糖体RNA基因研究细菌群落结构的变化。孵育期间细菌群落结构发生了变化，但在实验结束时，碳和矿物质营养成分均未引起变化。不稳定的有机碳的缺乏和矿物质营养的可获得性是控制细菌活动以及微生物食物网在碳固存中的作用的关键因素。

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