Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake

The coupling of lake dynamics with catchment biogeochemistry is considered the key element controlling primary production in mountain lakes at time scales of a few decades to millennia, yet little is known on the impacts of the morphometry of lakes throughout their ontogeny. As Lake Chungar a (Centr...

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Autores: Bao Casal, Roberto, Hernández Hernández, Armand, Sáez, Alberto, Giralt Romeu, Santiago, Prego, Ricardo, Pueyo Mur, Juan José, Moreno Caballud, Ana, Valero Garcés, Blas Lorenzo
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/69292
Acesso em linha:https://hdl.handle.net/2445/69292
Access Level:acceso abierto
Palavra-chave:Sediments lacustres
Andes (Regió)
Lake sediments
Andes Region
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spelling Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lakeBao Casal, RobertoHernández Hernández, ArmandSáez, AlbertoGiralt Romeu, SantiagoPrego, RicardoPueyo Mur, Juan JoséMoreno Caballud, AnaValero Garcés, Blas LorenzoSediments lacustresAndes (Regió)Lake sedimentsAndes RegionThe coupling of lake dynamics with catchment biogeochemistry is considered the key element controlling primary production in mountain lakes at time scales of a few decades to millennia, yet little is known on the impacts of the morphometry of lakes throughout their ontogeny. As Lake Chungar a (Central Andean Altiplano, northern Chile) experienced long-term lake-level fluctuations that strongly modified its area:volume ratio, it is an ideal system for exploring the relative roles that long-term climatic shifts and lake morphometry play on biosiliceous lacustrine productivity. In this paper, we review previous data on the percent contents of total organic carbon, total inorganic carbon, total nitrogen, total biogenic silica, isotopic composition of organic matter, carbonates, and diatom frustules, as well as data on the abundance of the chlorophycean Botryococcus braunii in this lake for the period 12,400 e1300 cal yr BP.We also include new data on organic carbon and biogenic silica mass accumulation rates and the diatom assemblage composition of an offshore core dated using 14C and U/Th. Biosiliceous productivity in Lake Chungar a was influenced by shifts in allochthonous nutrient inputs related to variability in precipitation. Humid phases dated at approx. 12,400 to 10,000 and 9600 to 7400 cal yr BP coincide with periods of elevated productivity, whereas decreases in productivity were recorded during arid phases dated at approx. 10,000 to 9600 and 7400 to 3550 cal yr BP (Andean mid- Holocene Aridity Period). However, morphometry-related inelake controls led to a lack of a linear response of productivity to precipitation variability. During the late Glacial to early Holocene, lowstands facilitated complete water column mixing, prompting episodic massive blooms of a large centric diatom, Cyclostephanos cf. andinus. Thus, moderate productivity could be maintained, regardless of aridity, by this phenomenon of morphometric eutrophy during the early history of the lake. The subsequent net increase in lake level introduced modifications in the area of the epilimnion sediments versus the total volume of the epilimnion, preventing complete overturn. Surpassing a certain depth threshold at approx. 8300 cal yr BP caused cessation of the morphometric eutrophy conditions associated with Cyclostephanos cf. andinus superblooms. After 7300 cal yr BP, the lake experienced a decrease in biosiliceous productivity and a change of state that involved a stronger dependence on precipitation variability, with a lesser contribution of diatoms to the total primary productivity. Our results show that the interpretation of lacustrine paleoproductivity records as paleoclimatic archives needs to take into account the effects of changes in the epilimnion sediment area to epilimnion volume ratio in association with lake ontogeny.Elsevier Ltd2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/69292Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: http://doi.org/10.1016/j.quascirev.2015.09.019Quaternary Science Reviews, 2015, vol. 129, p. 96-110http://doi.org/10.1016/j.quascirev.2015.09.019cc-by-nc-nd (c) Elsevier Ltd, 2015http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/692922026-05-27T06:46:51Z
dc.title.none.fl_str_mv Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
title Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
spellingShingle Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
Bao Casal, Roberto
Sediments lacustres
Andes (Regió)
Lake sediments
Andes Region
title_short Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
title_full Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
title_fullStr Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
title_full_unstemmed Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
title_sort Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
dc.creator.none.fl_str_mv Bao Casal, Roberto
Hernández Hernández, Armand
Sáez, Alberto
Giralt Romeu, Santiago
Prego, Ricardo
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero Garcés, Blas Lorenzo
author Bao Casal, Roberto
author_facet Bao Casal, Roberto
Hernández Hernández, Armand
Sáez, Alberto
Giralt Romeu, Santiago
Prego, Ricardo
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero Garcés, Blas Lorenzo
author_role author
author2 Hernández Hernández, Armand
Sáez, Alberto
Giralt Romeu, Santiago
Prego, Ricardo
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero Garcés, Blas Lorenzo
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Sediments lacustres
Andes (Regió)
Lake sediments
Andes Region
topic Sediments lacustres
Andes (Regió)
Lake sediments
Andes Region
description The coupling of lake dynamics with catchment biogeochemistry is considered the key element controlling primary production in mountain lakes at time scales of a few decades to millennia, yet little is known on the impacts of the morphometry of lakes throughout their ontogeny. As Lake Chungar a (Central Andean Altiplano, northern Chile) experienced long-term lake-level fluctuations that strongly modified its area:volume ratio, it is an ideal system for exploring the relative roles that long-term climatic shifts and lake morphometry play on biosiliceous lacustrine productivity. In this paper, we review previous data on the percent contents of total organic carbon, total inorganic carbon, total nitrogen, total biogenic silica, isotopic composition of organic matter, carbonates, and diatom frustules, as well as data on the abundance of the chlorophycean Botryococcus braunii in this lake for the period 12,400 e1300 cal yr BP.We also include new data on organic carbon and biogenic silica mass accumulation rates and the diatom assemblage composition of an offshore core dated using 14C and U/Th. Biosiliceous productivity in Lake Chungar a was influenced by shifts in allochthonous nutrient inputs related to variability in precipitation. Humid phases dated at approx. 12,400 to 10,000 and 9600 to 7400 cal yr BP coincide with periods of elevated productivity, whereas decreases in productivity were recorded during arid phases dated at approx. 10,000 to 9600 and 7400 to 3550 cal yr BP (Andean mid- Holocene Aridity Period). However, morphometry-related inelake controls led to a lack of a linear response of productivity to precipitation variability. During the late Glacial to early Holocene, lowstands facilitated complete water column mixing, prompting episodic massive blooms of a large centric diatom, Cyclostephanos cf. andinus. Thus, moderate productivity could be maintained, regardless of aridity, by this phenomenon of morphometric eutrophy during the early history of the lake. The subsequent net increase in lake level introduced modifications in the area of the epilimnion sediments versus the total volume of the epilimnion, preventing complete overturn. Surpassing a certain depth threshold at approx. 8300 cal yr BP caused cessation of the morphometric eutrophy conditions associated with Cyclostephanos cf. andinus superblooms. After 7300 cal yr BP, the lake experienced a decrease in biosiliceous productivity and a change of state that involved a stronger dependence on precipitation variability, with a lesser contribution of diatoms to the total primary productivity. Our results show that the interpretation of lacustrine paleoproductivity records as paleoclimatic archives needs to take into account the effects of changes in the epilimnion sediment area to epilimnion volume ratio in association with lake ontogeny.
publishDate 2015
dc.date.none.fl_str_mv 2015
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/2445/69292
url https://hdl.handle.net/2445/69292
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: http://doi.org/10.1016/j.quascirev.2015.09.019
Quaternary Science Reviews, 2015, vol. 129, p. 96-110
http://doi.org/10.1016/j.quascirev.2015.09.019
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier Ltd, 2015
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier Ltd, 2015
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Ltd
publisher.none.fl_str_mv Elsevier Ltd
dc.source.none.fl_str_mv Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
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 15,300724

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