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Temporal Variations in Microbial Activities and Carbon Turnover in Subtidal Sandy Sediments : Volume 5, Issue 6 (06/11/2008)

By Böer, S. I.

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Book Id: WPLBN0003991089
Format Type: PDF Article :
File Size: Pages 43
Reproduction Date: 2015

Title: Temporal Variations in Microbial Activities and Carbon Turnover in Subtidal Sandy Sediments : Volume 5, Issue 6 (06/11/2008)  
Author: Böer, S. I.
Volume: Vol. 5, Issue 6
Language: English
Subject: Science, Biogeosciences, Discussions
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Microbial Habitat Group, Max Planck Institute for Marine Microbiology, Bremen, Germany. Temporal dynamics and vertical patterns in bacterial abundances and activities were studied in a shallow subtidal sand flat in the Sylt-Rømø Basin (North Frisian Wadden Sea, Germany.) Extracellular enzymatic activities, bacterial carbon production and community respiration showed strong (factor of 4–5) temporal variations that were mostly related to seasonal temperature change, but also to changes in substrate availability. These temporal patterns in activity were barely reflected in bacterial (200–400 mmol C m−2) and microphytobenthic biomass (800–1500 mmol C m−2) or the sedimentary carbohydrate inventory (1300–2900 mmol C m−2), suggesting that grazing controls the standing stocks of the microphytobenthic and bacterial assemblages. Despite their exposure to strong hydrodynamic forces such as tidal currents and wind-induced wave surge, the subtidal sandy sediments showed persistent vertical gradients in bacterial abundances, bacterial carbon production and extracellular enzymatic activities at all times. The vertical distribution of these parameters was tightly coupled to that of the microphytobenthos, dominated by diatoms. Despite the low organic carbon content typical for surge-exposed sandy sediments, high extracellular enzymatic activities and bacterial carbon production rates indicate a very active heterotrophic bacterial community, with a gross secondary productivity of 30–180 mmol C m−2, and a biomass turnover time of 2–18 days. Our data suggest that this high activity is supported by the rapid flux of carbohydrates from microphytobenthic primary productivity. Accordingly, the potential activities of enzymes hydrolyzing carbohydrates cover most of the total bacterial carbon demand during all seasons.

Summary
Temporal variations in microbial activities and carbon turnover in subtidal sandy sediments

Excerpt
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