The University of Southampton
University of Southampton Institutional Repository

Microbial loop carbon cycling in ocean environments studied using a simple steady-state model

Microbial loop carbon cycling in ocean environments studied using a simple steady-state model
Microbial loop carbon cycling in ocean environments studied using a simple steady-state model
A simple steady-state model is used to examine the microbial loop as a pathway for organic C in marine systems, constrained by observed estimates of bacterial to primary production ratio (BP:PP) and bacterial growth efficiency (BGE). Carbon sources (primary production including extracellular release of dissolved organic carbon, DOC), cycling via zooplankton grazing and viral lysis, and sinks (bacterial and zooplankton respiration) are represented. Model solutions indicate that, at least under near steady-state conditions, recent estimates of BP:PP of about 0.1 to 0.15 are consistent with reasonable scenarios of C cycling (low BGE and phytoplankton extracellular release) at open ocean sites such as the Sargasso Sea and subarctic North Pacific. The finding that bacteria are a major (50%) sink for primary production is shown to be consistent with the best estimates of BGE and dissolved organic matter (DOM) production by zooplankton and phytoplankton. Zooplankton-related processes are predicted to provide the greatest supply of DOC for bacterial consumption. The bacterial contribution to C flow in the microbial loop, via bacterivory and viral lysis, is generally low, as a consequence of low BGE. Both BP and BGE are hard to quantify accurately. By indicating acceptable combinations of parameter values for given BP:PP, the model provides a simple tool for examining the reliability of BP and BGE estimates.
Microbial loop, Bacterial production, BGE, Models, DOC, Extracellular release
0948-3055
37-49
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Ducklow, Hugh W.
5cac79f8-e06e-4703-aa87-6942b63c32bb
Anderson, Thomas R.
dfed062f-e747-48d3-b59e-2f5e57a8571d
Ducklow, Hugh W.
5cac79f8-e06e-4703-aa87-6942b63c32bb

Anderson, Thomas R. and Ducklow, Hugh W. (2001) Microbial loop carbon cycling in ocean environments studied using a simple steady-state model. Aquatic Microbial Ecology, 26 (1), 37-49. (doi:10.3354/ame026037).

Record type: Article

Abstract

A simple steady-state model is used to examine the microbial loop as a pathway for organic C in marine systems, constrained by observed estimates of bacterial to primary production ratio (BP:PP) and bacterial growth efficiency (BGE). Carbon sources (primary production including extracellular release of dissolved organic carbon, DOC), cycling via zooplankton grazing and viral lysis, and sinks (bacterial and zooplankton respiration) are represented. Model solutions indicate that, at least under near steady-state conditions, recent estimates of BP:PP of about 0.1 to 0.15 are consistent with reasonable scenarios of C cycling (low BGE and phytoplankton extracellular release) at open ocean sites such as the Sargasso Sea and subarctic North Pacific. The finding that bacteria are a major (50%) sink for primary production is shown to be consistent with the best estimates of BGE and dissolved organic matter (DOM) production by zooplankton and phytoplankton. Zooplankton-related processes are predicted to provide the greatest supply of DOC for bacterial consumption. The bacterial contribution to C flow in the microbial loop, via bacterivory and viral lysis, is generally low, as a consequence of low BGE. Both BP and BGE are hard to quantify accurately. By indicating acceptable combinations of parameter values for given BP:PP, the model provides a simple tool for examining the reliability of BP and BGE estimates.

PDF
7956-01.pdf - Version of Record
Restricted to Repository staff only
Request a copy

More information

Published date: October 2001
Keywords: Microbial loop, Bacterial production, BGE, Models, DOC, Extracellular release

Identifiers

Local EPrints ID: 7956
URI: https://eprints.soton.ac.uk/id/eprint/7956
ISSN: 0948-3055
PURE UUID: 1801b457-034b-46f9-90fe-a67b198ca143

Catalogue record

Date deposited: 12 Aug 2004
Last modified: 17 Jul 2017 17:13

Export record

Altmetrics

Contributors

Author: Thomas R. Anderson
Author: Hugh W. Ducklow

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×