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Rapid Carbon Cycling in the Oligotrophic Ocean : Volume 8, Issue 6 (07/12/2011)

By Duarte, C. M.

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Book Id: WPLBN0004005729
Format Type: PDF Article :
File Size: Pages 27
Reproduction Date: 2015

Title: Rapid Carbon Cycling in the Oligotrophic Ocean : Volume 8, Issue 6 (07/12/2011)  
Author: Duarte, C. M.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Agustí, S., & Duarte, C. M. (2011). Rapid Carbon Cycling in the Oligotrophic Ocean : Volume 8, Issue 6 (07/12/2011). Retrieved from http://cn.ebooklibrary.org/

Description: Department of Global Change Research, IMEDEA (CSIC-UIB), Instituto Mediterráneo de Estudios Avanzados, Miquel Marqués 21, 07190 Esporles, Spain. The dynamics of organic carbon production, release and bacterial use was examined across a range of communities spanning from highly oligotrophic ones in the Subtropical Atlantic Ocean, mesotrophic ones in the Mediterranean Sea and productive ones in the Northern African upwelling and the Southern Ocean. A comparative analysis of experiments examining total and particulate organic carbon production across a range of time scales (15 min to 24 h) for 20 communities with contrasting phytoplankton cell status, as assessed by cell lysis rates, and the use of a simple inverse model was used to resolve patterns of carbon flow in the microbial food web. Communities in productive ocean waters accumulated organic carbon over hourly time scales, whereas only a small fraction of net primary production accumulated in communities from oligotrophic waters. These communities supported high phytoplankton cell lysis rates leading to a rapid flux of organic carbon to bacteria, which had high affinity for phytoplankton-derived carbon, much of which was rapidly respired. Conventional assessments of primary production in the oligotrophic ocean severely underestimate net phytoplankton production, as carbon flow in microbial communities from oligotrophic ocean waters occurs within short (minutes) time scales. This explains difficulties to reconcile estimates of primary production with independent estimates of carbon use by bacteria in oligotrophic marine ecosystems.

Rapid carbon cycling in the oligotrophic ocean

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