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THE ROLE OF HETEROTROPHIC BACTERIA IN IRON-LIMITED OCEAN ECOSYSTEMS

机译:异养细菌在含铁量有限的海洋生态系统中的作用

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IRON availability limits phytoplankton growth in large areas of the world's oceans(1-3) and may influence the strength of the biological carbon pump(4-5). Very little is known of the iron requirements of oceanic heterotrophic bacteria, which constitute up to 50% of the total particulate organic carbon in open ocean waters(6,7) and are important in carbon cycling as remineralizers of dissolved organic matter and hence producers of CO2 (ref. 8). Here we report that oceanic bacteria contain more iron per biomass than phytoplankton. Tn the subarctic Pacific, they constitute a large fraction of biogenic iron and account for 20-45% of biological iron uptake, Bacterial iron quotas in the field are similar to those of iran-deficient laboratory cultures, which exhibit reduced electron transport, slow growth, and low carbon growth efficiency. Heterotrophic bacteria therefore play a major role in the biogeochemical cycling of iron. In situ iron limitation of heterotrophic metabolism may have profound effects on carbon Bur in the ocean. [References: 29]
机译:铁的可用性限制了世界大范围海洋中浮游植物的生长(1-3),并可能影响生物碳泵的强度(4-5)。海洋异养细菌对铁的需求知之甚少,这些细菌占露天海水中总颗粒有机碳的50%(6,7),并且在碳循环中作为溶解性有机物的再矿化剂和因此而产生的重要物质。二氧化碳(参考文献8)。在这里我们报告说,海洋细菌每生物量所含的铁比浮游植物多。在北极亚太平洋地区,它们构成了生物铁的很大一部分,占生物铁吸收的20-45%。该领域的细菌铁配额类似于伊朗缺乏的实验室培养物,其电子传输减少,生长缓慢,并且碳增长效率低。因此,异养细菌在铁的生物地球化学循环中起主要作用。原位铁限制异养代谢可能会对海洋中的碳伯产生深远影响。 [参考:29]

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