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Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean

Increasing Transparent Exopolymer Particle (TEP) formation during diatom blooms as a result of elevated temperature and pCO(2) have been suggested to result in enhanced aggregation and carbon flux, therewith potentially increasing the sequestration of carbon by the ocean. We present experimental res...

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Autores principales: Seebah, Shalin, Fairfield, Caitlin, Ullrich, Matthias S., Passow, Uta
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4223051/
https://www.ncbi.nlm.nih.gov/pubmed/25375640
http://dx.doi.org/10.1371/journal.pone.0112379
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author Seebah, Shalin
Fairfield, Caitlin
Ullrich, Matthias S.
Passow, Uta
author_facet Seebah, Shalin
Fairfield, Caitlin
Ullrich, Matthias S.
Passow, Uta
author_sort Seebah, Shalin
collection PubMed
description Increasing Transparent Exopolymer Particle (TEP) formation during diatom blooms as a result of elevated temperature and pCO(2) have been suggested to result in enhanced aggregation and carbon flux, therewith potentially increasing the sequestration of carbon by the ocean. We present experimental results on TEP and aggregate formation by Thalassiosira weissflogii (diatom) in the presence or absence of bacteria under two temperature and three pCO(2) scenarios. During the aggregation phase of the experiment TEP formation was elevated at the higher temperature (20°C vs. 15°C), as predicted. However, in contrast to expectations based on the established relationship between TEP and aggregation, aggregation rates and sinking velocity of aggregates were depressed in warmer treatments, especially under ocean acidification conditions. If our experimental findings can be extrapolated to natural conditions, they would imply a reduction in carbon flux and potentially reduced carbon sequestration after diatom blooms in the future ocean.
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spelling pubmed-42230512014-11-13 Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean Seebah, Shalin Fairfield, Caitlin Ullrich, Matthias S. Passow, Uta PLoS One Research Article Increasing Transparent Exopolymer Particle (TEP) formation during diatom blooms as a result of elevated temperature and pCO(2) have been suggested to result in enhanced aggregation and carbon flux, therewith potentially increasing the sequestration of carbon by the ocean. We present experimental results on TEP and aggregate formation by Thalassiosira weissflogii (diatom) in the presence or absence of bacteria under two temperature and three pCO(2) scenarios. During the aggregation phase of the experiment TEP formation was elevated at the higher temperature (20°C vs. 15°C), as predicted. However, in contrast to expectations based on the established relationship between TEP and aggregation, aggregation rates and sinking velocity of aggregates were depressed in warmer treatments, especially under ocean acidification conditions. If our experimental findings can be extrapolated to natural conditions, they would imply a reduction in carbon flux and potentially reduced carbon sequestration after diatom blooms in the future ocean. Public Library of Science 2014-11-06 /pmc/articles/PMC4223051/ /pubmed/25375640 http://dx.doi.org/10.1371/journal.pone.0112379 Text en © 2014 Seebah et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Seebah, Shalin
Fairfield, Caitlin
Ullrich, Matthias S.
Passow, Uta
Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title_full Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title_fullStr Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title_full_unstemmed Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title_short Aggregation and Sedimentation of Thalassiosira weissflogii (diatom) in a Warmer and More Acidified Future Ocean
title_sort aggregation and sedimentation of thalassiosira weissflogii (diatom) in a warmer and more acidified future ocean
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4223051/
https://www.ncbi.nlm.nih.gov/pubmed/25375640
http://dx.doi.org/10.1371/journal.pone.0112379
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