Vertical patterns of metabolism in three contrasting stratified lakes

Recent advances in open water measurements suggest significant temporal and spatial variability of gross primary production (GPP), net ecosystem production (NEP), and respiration (R) with implications for understanding carbon cycling in lakes. This study applied high frequency depth profiles in thre...

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Autores: Obrador Sala, Biel, Staehr, Peter A., Christensen, Jesper P. C.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/218439
Acceso en línea:https://hdl.handle.net/2445/218439
Access Level:acceso abierto
Palabra clave:Metabolisme
Llacs
Metabolism
Lakes
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spelling Vertical patterns of metabolism in three contrasting stratified lakesObrador Sala, BielStaehr, Peter A.Christensen, Jesper P. C.MetabolismeLlacsMetabolismLakesRecent advances in open water measurements suggest significant temporal and spatial variability of gross primary production (GPP), net ecosystem production (NEP), and respiration (R) with implications for understanding carbon cycling in lakes. This study applied high frequency depth profiles in three stratified lakes of different trophic status to investigate 1) the importance of vertical variations in metabolic rates, 2) the effects of changes in the depth of the mixed layer (Z<sub>mix</sub>) and the photic zone (Z<sub>eu</sub>), and 3) the photoacclimative responses of the aquatic autotrophs to changes in these conditions. Taking account of vertical differences in metabolism improved the reliability of whole-areal NEP estimates during stratification. Whereas the hypolimnion was always heterotrophic, and the epilimnion was mostly autotrophic, the metalimnion had NEP>0 when Z<sub>eu</sub>>Z<sub>mix</sub>. Although most of GPP and R occurred in the epilimnion, between 0-20% of GPP and 4-37% of R took place in the metalimnion. Areal metabolic estimates based on surface measurements deviated up to 60% for GPP and 80% for R when Z<sub>eu</sub> > Z<sub>mix</sub>. The vertical variability in metabolism was driven by available light in both the epi- and metalimnion. Coupling between GPP and R was low in all layers and indicated increasing background R with depth. Light utilization efficiency was significantly higher under low light conditions, indicating photophysiological acclimation of phytoplankton to decreasing light in the metalimnion.American Society of Limnology and Oceanography.2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/218439Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.4319/lo.2014.59.4.1228Limnology and Oceanography, 2014, vol. 59, num.4, p. 1228-1240https://doi.org/10.4319/lo.2014.59.4.1228(c) American Society of Limnology and Oceanography., 2014info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2184392026-05-27T06:46:51Z
dc.title.none.fl_str_mv Vertical patterns of metabolism in three contrasting stratified lakes
title Vertical patterns of metabolism in three contrasting stratified lakes
spellingShingle Vertical patterns of metabolism in three contrasting stratified lakes
Obrador Sala, Biel
Metabolisme
Llacs
Metabolism
Lakes
title_short Vertical patterns of metabolism in three contrasting stratified lakes
title_full Vertical patterns of metabolism in three contrasting stratified lakes
title_fullStr Vertical patterns of metabolism in three contrasting stratified lakes
title_full_unstemmed Vertical patterns of metabolism in three contrasting stratified lakes
title_sort Vertical patterns of metabolism in three contrasting stratified lakes
dc.creator.none.fl_str_mv Obrador Sala, Biel
Staehr, Peter A.
Christensen, Jesper P. C.
author Obrador Sala, Biel
author_facet Obrador Sala, Biel
Staehr, Peter A.
Christensen, Jesper P. C.
author_role author
author2 Staehr, Peter A.
Christensen, Jesper P. C.
author2_role author
author
dc.subject.none.fl_str_mv Metabolisme
Llacs
Metabolism
Lakes
topic Metabolisme
Llacs
Metabolism
Lakes
description Recent advances in open water measurements suggest significant temporal and spatial variability of gross primary production (GPP), net ecosystem production (NEP), and respiration (R) with implications for understanding carbon cycling in lakes. This study applied high frequency depth profiles in three stratified lakes of different trophic status to investigate 1) the importance of vertical variations in metabolic rates, 2) the effects of changes in the depth of the mixed layer (Z<sub>mix</sub>) and the photic zone (Z<sub>eu</sub>), and 3) the photoacclimative responses of the aquatic autotrophs to changes in these conditions. Taking account of vertical differences in metabolism improved the reliability of whole-areal NEP estimates during stratification. Whereas the hypolimnion was always heterotrophic, and the epilimnion was mostly autotrophic, the metalimnion had NEP>0 when Z<sub>eu</sub>>Z<sub>mix</sub>. Although most of GPP and R occurred in the epilimnion, between 0-20% of GPP and 4-37% of R took place in the metalimnion. Areal metabolic estimates based on surface measurements deviated up to 60% for GPP and 80% for R when Z<sub>eu</sub> > Z<sub>mix</sub>. The vertical variability in metabolism was driven by available light in both the epi- and metalimnion. Coupling between GPP and R was low in all layers and indicated increasing background R with depth. Light utilization efficiency was significantly higher under low light conditions, indicating photophysiological acclimation of phytoplankton to decreasing light in the metalimnion.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/218439
url https://hdl.handle.net/2445/218439
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.4319/lo.2014.59.4.1228
Limnology and Oceanography, 2014, vol. 59, num.4, p. 1228-1240
https://doi.org/10.4319/lo.2014.59.4.1228
dc.rights.none.fl_str_mv (c) American Society of Limnology and Oceanography., 2014
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Society of Limnology and Oceanography., 2014
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Society of Limnology and Oceanography.
publisher.none.fl_str_mv American Society of Limnology and Oceanography.
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
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score 15.81155

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