Single bacterial strain capable of significant contribution to carbon cycling in the surface ocean

Byron E. Pedler; Lihini I. Aluwihare; Farooq Azam

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Single bacterial strain capable of significant contribution to carbon cycling in the surface ocean

机译：Single bacterial strain capable of significant contribution to carbon cycling in the surface ocean

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Marine dissolved organic carbon (DOC) encompasses one of the largest reservoirs of carbon on Earth. Heterotrophic bacteria are the primary biotic force regulating the fate of this material, yet the capacity of individual strains to significantly contribute to carbon cycling is unknown. Here we quantified the ability of a single Alteromonas strain Alteromonas sp. strain Scripps Institution of Oceanography (AltSIO) to drawdown ambient DOC in a coastal ecosystem. In three experiments, AltSIO alone consumed the entire pool of labile DOC, defined here as the quantity consumed by the submicron size fraction of ambient microbial assemblages within 5 d. These findings demonstrate that complete removal of the labile DOC pool in coastal surface seawater can be achieved by a single taxon. During long-term incubations (>1 y) testing semilabile DOC consumption, AltSIO entered dormancy but remained viable, while the diverse assemblages continued to consume carbon. Given that AltSIO is a large bacterium and thus subject to increased grazing pressure, we sought to determine the ecological relevance of this phenotype. Growth dynamics in natural seawater revealed that AltSIO rapidly outgrew the native bacteria, and despite intense grazing pressure, was never eliminated from the population. A survey in the California Current Ecosystem revealed that large bacteria (≥40 fg C·cell~(-1)) were persistent, accounting for up to 12 of total bacterial abundance and 24 of total bacterial biomass. We conclude that large, rapidly growing bacteria have the potential to disproportionately alter the fate of carbon in the mesotrophic ocean and play an important role in ecosystem function.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第20期|7202-7207|共6页
作者
Byron E. Pedler; Lihini I. Aluwihare; Farooq Azam;
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作者单位

Marine Biology Research Division University of California, San Diego, La Jolla, CA 92093-0202;

Geosciences Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0202;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
dissolved organic matter; ocean carbon cycle; marine biogeochemistry; microbial loop; CCE;

Single bacterial strain capable of significant contribution to carbon cycling in the surface ocean

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