Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study

The production of transparent exopolymer particles (TEP) in response to several environmental variables was studied in 2 mesocosm experiments. The first (Expt 1) examined a gradient of 4 nutrient levels; the second (Expt 2) examined different conditions of silicate availability and zooplankton prese...

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Authors: Pedrotti, M. L., Peters, F., Beauvais, S., Vidal Barcelona, Montserrat, Egge, J., Jacobsen, A., Marrasé, Cèlia
Format: article
Status:Published version
Publication Date:2010
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/53392
Online Access:https://hdl.handle.net/2445/53392
Access Level:Open access
Keyword:Biopolímers
Nutrients (Medi ambient)
Fitoplàncton
Carboni
Biopolymers
Nutrients (Ecology)
Phytoplankton
Carbon
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spelling Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm studyPedrotti, M. L.Peters, F.Beauvais, S.Vidal Barcelona, MontserratEgge, J.Jacobsen, A.Marrasé, CèliaBiopolímersNutrients (Medi ambient)FitoplànctonCarboniBiopolymersNutrients (Ecology)PhytoplanktonCarbonThe production of transparent exopolymer particles (TEP) in response to several environmental variables was studied in 2 mesocosm experiments. The first (Expt 1) examined a gradient of 4 nutrient levels; the second (Expt 2) examined different conditions of silicate availability and zooplankton presence. Tanks were separated in 2 series, one subjected to turbulence and the other not influenced by turbulence. In tanks with nutrient addition, TEP were rapidly formed, with net apparent production rates closely linked to chl a growth rates, suggesting that phytoplankton cells were actively exuding TEP precursors. High nutrient availability increased the absolute concentration of TEP; however, the relative quantity of TEP produced was found to be lower, as TEP concentration per unit of phytoplankton biomass was inversely related to the initial nitrate dose. In Expt 1, an increase in TEP volume (3 to 48 µm equivalent spherical diameter) with nutrient dose was observed; in Expt 2, both silicate addition and turbulence enhanced TEP production and favored aggregation to larger TEP (>48 µm). The presence of zooplankton lowered TEP concentration and changed the size distribution of TEP, presumably by grazing on TEP or phytoplankton. For lower nutrient concentrations, the ratio of particulate organic carbon (POC) to particulate organic nitrogen (PON) followed the Redfield ratio. At higher nutrient conditions, when nutrients were exhausted during the post-bloom, a decoupling of carbon and nitrogen dynamics occurred and was correlated to TEP formation, with a large flow of carbon channeled toward the TEP pool in turbulent tanks. TEP accounted for an increase in POC concentration of 50% in high-nutrient and turbulent conditions. The study of TEP dynamics is crucial to understanding the biogeochemical response of the aquatic system to forcing variables such as nutrient availability and turbulence intensity.Inter-Research2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/53392Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: http://dx.doi.org/10.3354/meps08840Marine Ecology Progress Series, 2010, vol. 419, p. 57-69http://dx.doi.org/10.3354/meps08840(c) Inter-Research, 2010info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/533922026-05-27T06:46:51Z
dc.title.none.fl_str_mv Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
title Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
spellingShingle Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
Pedrotti, M. L.
Biopolímers
Nutrients (Medi ambient)
Fitoplàncton
Carboni
Biopolymers
Nutrients (Ecology)
Phytoplankton
Carbon
title_short Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
title_full Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
title_fullStr Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
title_full_unstemmed Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
title_sort Effects of nutrients and turbulence on the production of transparent exopolymer particles: a mesocosm study
dc.creator.none.fl_str_mv Pedrotti, M. L.
Peters, F.
Beauvais, S.
Vidal Barcelona, Montserrat
Egge, J.
Jacobsen, A.
Marrasé, Cèlia
author Pedrotti, M. L.
author_facet Pedrotti, M. L.
Peters, F.
Beauvais, S.
Vidal Barcelona, Montserrat
Egge, J.
Jacobsen, A.
Marrasé, Cèlia
author_role author
author2 Peters, F.
Beauvais, S.
Vidal Barcelona, Montserrat
Egge, J.
Jacobsen, A.
Marrasé, Cèlia
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Biopolímers
Nutrients (Medi ambient)
Fitoplàncton
Carboni
Biopolymers
Nutrients (Ecology)
Phytoplankton
Carbon
topic Biopolímers
Nutrients (Medi ambient)
Fitoplàncton
Carboni
Biopolymers
Nutrients (Ecology)
Phytoplankton
Carbon
description The production of transparent exopolymer particles (TEP) in response to several environmental variables was studied in 2 mesocosm experiments. The first (Expt 1) examined a gradient of 4 nutrient levels; the second (Expt 2) examined different conditions of silicate availability and zooplankton presence. Tanks were separated in 2 series, one subjected to turbulence and the other not influenced by turbulence. In tanks with nutrient addition, TEP were rapidly formed, with net apparent production rates closely linked to chl a growth rates, suggesting that phytoplankton cells were actively exuding TEP precursors. High nutrient availability increased the absolute concentration of TEP; however, the relative quantity of TEP produced was found to be lower, as TEP concentration per unit of phytoplankton biomass was inversely related to the initial nitrate dose. In Expt 1, an increase in TEP volume (3 to 48 µm equivalent spherical diameter) with nutrient dose was observed; in Expt 2, both silicate addition and turbulence enhanced TEP production and favored aggregation to larger TEP (>48 µm). The presence of zooplankton lowered TEP concentration and changed the size distribution of TEP, presumably by grazing on TEP or phytoplankton. For lower nutrient concentrations, the ratio of particulate organic carbon (POC) to particulate organic nitrogen (PON) followed the Redfield ratio. At higher nutrient conditions, when nutrients were exhausted during the post-bloom, a decoupling of carbon and nitrogen dynamics occurred and was correlated to TEP formation, with a large flow of carbon channeled toward the TEP pool in turbulent tanks. TEP accounted for an increase in POC concentration of 50% in high-nutrient and turbulent conditions. The study of TEP dynamics is crucial to understanding the biogeochemical response of the aquatic system to forcing variables such as nutrient availability and turbulence intensity.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/53392
url https://hdl.handle.net/2445/53392
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://dx.doi.org/10.3354/meps08840
Marine Ecology Progress Series, 2010, vol. 419, p. 57-69
http://dx.doi.org/10.3354/meps08840
dc.rights.none.fl_str_mv (c) Inter-Research, 2010
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Inter-Research, 2010
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Inter-Research
publisher.none.fl_str_mv Inter-Research
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869407728471900160
score 15,300719

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