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

15 páginas, 6 figuras, 1 tabla

Detalles Bibliográficos
Autores: Bao, Roberto, Hernández, Armand, Sáez, Alberto, Giralt, Santiago, Prego, R., Pueyo Mur, Juan José, Moreno Caballud, Ana, Valero-Garcés, Blas L.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/124949
Acceso en línea:http://hdl.handle.net/10261/124949
Access Level:acceso abierto
Palabra clave:Lake paleoproductivity
Lake ontogeny
Laminated sediments
Diatoms
Andean Altiplano
Holocene
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spelling Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lakeBao, RobertoHernández, ArmandSáez, AlbertoGiralt, SantiagoPrego, R.Pueyo Mur, Juan JoséMoreno Caballud, AnaValero-Garcés, Blas L.Lake paleoproductivityLake ontogenyLaminated sedimentsDiatomsAndean AltiplanoHolocene15 páginas, 6 figuras, 1 tablaThe 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 Chungará (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 12,400–1300 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 Chungará 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 in–lake 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 ontogenyThe Spanish Ministry of Science and Innovation funded this research through the projects ANDESTER (BTE2001-3225), Complementary Action (BTE2001-5257-E), LAVOLTER (CGL2004-00683/BTE), GEOBILA (CGL2007-60932/BTE) and CONSOLIDER-Ingenio 2010 GRACCIE (CSD2007-00067)Peer reviewedElsevierConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201520152015info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/124949reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.quascirev.2015.09.019Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1249492026-05-22T06:33:51Z
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, Roberto
Lake paleoproductivity
Lake ontogeny
Laminated sediments
Diatoms
Andean Altiplano
Holocene
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, Roberto
Hernández, Armand
Sáez, Alberto
Giralt, Santiago
Prego, R.
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero-Garcés, Blas L.
author Bao, Roberto
author_facet Bao, Roberto
Hernández, Armand
Sáez, Alberto
Giralt, Santiago
Prego, R.
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero-Garcés, Blas L.
author_role author
author2 Hernández, Armand
Sáez, Alberto
Giralt, Santiago
Prego, R.
Pueyo Mur, Juan José
Moreno Caballud, Ana
Valero-Garcés, Blas L.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Lake paleoproductivity
Lake ontogeny
Laminated sediments
Diatoms
Andean Altiplano
Holocene
topic Lake paleoproductivity
Lake ontogeny
Laminated sediments
Diatoms
Andean Altiplano
Holocene
description 15 páginas, 6 figuras, 1 tabla
publishDate 2015
dc.date.none.fl_str_mv 2015
2015
2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/124949
url http://hdl.handle.net/10261/124949
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.quascirev.2015.09.019
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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