Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina

Autores
Massaferro, Julieta; Laprida, Cecilia; Orpella, Germán; Mercau, J. Ramón
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Lakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables. However, the use of these microfossils in quaternary studies for southern Patagonia is still limited and poorly understood because of the paucity of regional taxonomic and palaeonvironmental knowledge. The multi-proxy study of lacustrine sediments from Laguna El Chaltel presented here aims to partially fill this gap. Laguna El Chaltel is a permanent lake located at 49"58'25"S, 71"06'53"W in southern Patagonia, Argentina, in the semidesert steppe east of the Andes. A 60.8-cm short sediment core has been analysed in order to obtain information about the paleoenvironmental evolution of the lake during the last ca. 5000 yr BP. The 210Pb237Cs dating gave an age of 4685 cal yr BP for the base of the core. The presence and abundance of littoral chironomids of the genus Polypedilum Kieffer suggest oscillations in the lake level during the timespan of the core, while variations in the relative abundance of the ostracod Limnocythere rionegroensis Cusminsky and Whatley indicate the onset of periods of evaporative concentration. Some geochemical and physical parameters such as TIC (total inorganic carbon), TOC (total organic carbon) and magnetic susceptibility show similar patterns evidencing important variations in lake dynamics.
Simposio VIII: Paleoentomología y paleolimnología: objetivos particulares y comunes
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16727
Acceder
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network_name_str SEDICI (UNLP)
spelling Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, ArgentinaMassaferro, JulietaLaprida, CeciliaOrpella, GermánMercau, J. RamónCiencias NaturalesPaleontologíaFossil chironomidsOstracodsLaguna El ChaltelPatagonia, ArgentinaLakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables. However, the use of these microfossils in quaternary studies for southern Patagonia is still limited and poorly understood because of the paucity of regional taxonomic and palaeonvironmental knowledge. The multi-proxy study of lacustrine sediments from Laguna El Chaltel presented here aims to partially fill this gap. Laguna El Chaltel is a permanent lake located at 49"58'25"S, 71"06'53"W in southern Patagonia, Argentina, in the semidesert steppe east of the Andes. A 60.8-cm short sediment core has been analysed in order to obtain information about the paleoenvironmental evolution of the lake during the last ca. 5000 yr BP. The <sup>210</sup>Pb<sup>237</sup>Cs dating gave an age of 4685 cal yr BP for the base of the core. The presence and abundance of littoral chironomids of the genus Polypedilum Kieffer suggest oscillations in the lake level during the timespan of the core, while variations in the relative abundance of the ostracod Limnocythere rionegroensis Cusminsky and Whatley indicate the onset of periods of evaporative concentration. Some geochemical and physical parameters such as TIC (total inorganic carbon), TOC (total organic carbon) and magnetic susceptibility show similar patterns evidencing important variations in lake dynamics.Simposio VIII: Paleoentomología y paleolimnología: objetivos particulares y comunesFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16727enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T10:45:36Zoai:sedici.unlp.edu.ar:10915/16727Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 10:45:37.045SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
spellingShingle Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
Massaferro, Julieta
Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
title_short Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_full Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_fullStr Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_full_unstemmed Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
title_sort Fossil chironomids and ostracods from a 5000 years- sediment sequence of Laguna El Chaltel, southern Patagonia, Argentina
dc.creator.none.fl_str_mv Massaferro, Julieta
Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
author Massaferro, Julieta
author_facet Massaferro, Julieta
Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
author_role author
author2 Laprida, Cecilia
Orpella, Germán
Mercau, J. Ramón
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
topic Ciencias Naturales
Paleontología
Fossil chironomids
Ostracods
Laguna El Chaltel
Patagonia, Argentina
dc.description.none.fl_txt_mv Lakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables. However, the use of these microfossils in quaternary studies for southern Patagonia is still limited and poorly understood because of the paucity of regional taxonomic and palaeonvironmental knowledge. The multi-proxy study of lacustrine sediments from Laguna El Chaltel presented here aims to partially fill this gap. Laguna El Chaltel is a permanent lake located at 49"58'25"S, 71"06'53"W in southern Patagonia, Argentina, in the semidesert steppe east of the Andes. A 60.8-cm short sediment core has been analysed in order to obtain information about the paleoenvironmental evolution of the lake during the last ca. 5000 yr BP. The <sup>210</sup>Pb<sup>237</sup>Cs dating gave an age of 4685 cal yr BP for the base of the core. The presence and abundance of littoral chironomids of the genus Polypedilum Kieffer suggest oscillations in the lake level during the timespan of the core, while variations in the relative abundance of the ostracod Limnocythere rionegroensis Cusminsky and Whatley indicate the onset of periods of evaporative concentration. Some geochemical and physical parameters such as TIC (total inorganic carbon), TOC (total organic carbon) and magnetic susceptibility show similar patterns evidencing important variations in lake dynamics.
Simposio VIII: Paleoentomología y paleolimnología: objetivos particulares y comunes
Facultad de Ciencias Naturales y Museo
description Lakes are excellent sensors of environmental change, including climate change. Chironomids (Insecta, Diptera) and ostracods (Crustacea) are among the most useful biological indicators for paleoenvironmental reconstruction found in lake sediments, due to their sensitiveness to environmental variables. However, the use of these microfossils in quaternary studies for southern Patagonia is still limited and poorly understood because of the paucity of regional taxonomic and palaeonvironmental knowledge. The multi-proxy study of lacustrine sediments from Laguna El Chaltel presented here aims to partially fill this gap. Laguna El Chaltel is a permanent lake located at 49"58'25"S, 71"06'53"W in southern Patagonia, Argentina, in the semidesert steppe east of the Andes. A 60.8-cm short sediment core has been analysed in order to obtain information about the paleoenvironmental evolution of the lake during the last ca. 5000 yr BP. The <sup>210</sup>Pb<sup>237</sup>Cs dating gave an age of 4685 cal yr BP for the base of the core. The presence and abundance of littoral chironomids of the genus Polypedilum Kieffer suggest oscillations in the lake level during the timespan of the core, while variations in the relative abundance of the ostracod Limnocythere rionegroensis Cusminsky and Whatley indicate the onset of periods of evaporative concentration. Some geochemical and physical parameters such as TIC (total inorganic carbon), TOC (total organic carbon) and magnetic susceptibility show similar patterns evidencing important variations in lake dynamics.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
Resumen
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
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status_str publishedVersion
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dc.language.none.fl_str_mv eng
language eng
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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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dc.format.none.fl_str_mv application/pdf
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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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