Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake

Detalhes bibliográficos
Autor(a) principal: Cardozo, A. Y. V.
Data de Publicação: 2014
Outros Autores: Gomes, Doriedson Ferrreira, Silva, Eduardo Mendes da, Duque, S. R. E., Rangel, J. O. Ch., Sifeddine, Abdelfettah, Turcq, Bruno, Albuquerque, Ana Luiza Spadano
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/17293
Resumo: Texto completo: acesso restrito. p.127–136
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spelling Cardozo, A. Y. V.Gomes, Doriedson FerrreiraSilva, Eduardo Mendes daDuque, S. R. E.Rangel, J. O. Ch.Sifeddine, AbdelfettahTurcq, BrunoAlbuquerque, Ana Luiza SpadanoCardozo, A. Y. V.Gomes, Doriedson FerrreiraSilva, Eduardo Mendes daDuque, S. R. E.Rangel, J. O. Ch.Sifeddine, AbdelfettahTurcq, BrunoAlbuquerque, Ana Luiza Spadano2015-03-27T20:17:23Z20140031-0182http://repositorio.ufba.br/ri/handle/ri/17293v. 415, n. 1Texto completo: acesso restrito. p.127–136Aquatic environments in the high-Andean may be quite vulnerable to climatic conditions and hydrological processes (precipitation/evaporation) that have the potential to alter water levels and chemistry. This study reconstructs the paleohydrological history of Lake Tota, Colombia, to provide a record of environmental changes in the eastern flank of the Colombian Andes during the late Holocene. A 54 cm core was collected at the margin of the lake at a depth of 1.5 m, and the paleohydrological reconstructions were based on changes in diatom assemblages, granulometry, and bulk organic geochemical parameters. The core was subdivided into 5 biozones by assessing the significance of the variance among the CONISS clusters. Biozone T5 (base, 4000 calibrated years BP) was dominated by the planktonic diatom Discostella stelligera and was deposited in a period of high-water level. Sedimentation during this period was rich in carbon due to phytoplanktonic production; the granulometry data suggests that the lake was under high to moderate hydrological dynamic conditions, indicating active deposition at the river delta front. Biozone T4, beginning at 3600 cal. yrs BP, was dominated by three species D. stelligera, Cocconeis placentula var. lineata and Fragilaria sensu lato, and this association could indicate that the lake was under the influence of large fluctuations in water level. This interpretation is supported by granulometry and geochemical data, particularly by the low levels of total organic carbon (TOC). In biozone T3, corresponding to 3000 cal. yrs BP, we found a lowering of the water level, suggested by low levels of TOC. Poor granulometric sorting and higher carbon/nitrogen (C/N) ratios suggest a macrophyte influence on the sedimentation, avoiding direct deltaic influence. In this biozone the benthic diatom F. sensu lato group was dominant. In biozone T2, starting 2400 cal. yrs BP, the proxies indicate that the lake experienced increasing water levels and that stronger circulation patterns occurred in the water column than in the preceding periods, as inferred by the presence of Aulacoseira granulata a ticoplanktonic species. The sediment in this biozone is well sorted and finer, indicating a greater depth. Biozone T1 at the top of the core and since 2000 cal. yrs BP to the present, evidence for a recent reduction in water level of Lake Tota can be deduced by the presence of Achnanthidium minutissimum var. minutissimum.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2015-03-24T11:47:19Z No. of bitstreams: 1 A.Y.V. Cardozo.pdf: 1407391 bytes, checksum: feec92b74d278949937b1df641ee425f (MD5)Approved for entry into archive by Alda Lima da Silva (sivalda@ufba.br) on 2015-03-27T20:17:23Z (GMT) No. of bitstreams: 1 A.Y.V. Cardozo.pdf: 1407391 bytes, checksum: feec92b74d278949937b1df641ee425f (MD5)Made available in DSpace on 2015-03-27T20:17:23Z (GMT). No. of bitstreams: 1 A.Y.V. Cardozo.pdf: 1407391 bytes, checksum: feec92b74d278949937b1df641ee425f (MD5) Previous issue date: 2013http://dx.doi.org/10.1016/j.palaeo.2014.03.013reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAPaleohydrologyLate HoloceneDiatomsSedimentaryOrganic geochemistryLake TotaHolocene paleolimnological reconstruction of a high altitude Colombian tropical lakePalaeogeography, Palaeoclimatology, Palaeoecologyinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01Brasilinfo:eu-repo/semantics/openAccessengORIGINALA.Y.V. Cardozo.pdfA.Y.V. Cardozo.pdfapplication/pdf1407391https://repositorio.ufba.br/bitstream/ri/17293/1/A.Y.V.%20Cardozo.pdffeec92b74d278949937b1df641ee425fMD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/17293/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXTA.Y.V. Cardozo.pdf.txtA.Y.V. 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dc.title.pt_BR.fl_str_mv Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
dc.title.alternative.pt_BR.fl_str_mv Palaeogeography, Palaeoclimatology, Palaeoecology
title Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
spellingShingle Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
Cardozo, A. Y. V.
Paleohydrology
Late Holocene
Diatoms
Sedimentary
Organic geochemistry
Lake Tota
title_short Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
title_full Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
title_fullStr Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
title_full_unstemmed Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
title_sort Holocene paleolimnological reconstruction of a high altitude Colombian tropical lake
author Cardozo, A. Y. V.
author_facet Cardozo, A. Y. V.
Gomes, Doriedson Ferrreira
Silva, Eduardo Mendes da
Duque, S. R. E.
Rangel, J. O. Ch.
Sifeddine, Abdelfettah
Turcq, Bruno
Albuquerque, Ana Luiza Spadano
author_role author
author2 Gomes, Doriedson Ferrreira
Silva, Eduardo Mendes da
Duque, S. R. E.
Rangel, J. O. Ch.
Sifeddine, Abdelfettah
Turcq, Bruno
Albuquerque, Ana Luiza Spadano
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Cardozo, A. Y. V.
Gomes, Doriedson Ferrreira
Silva, Eduardo Mendes da
Duque, S. R. E.
Rangel, J. O. Ch.
Sifeddine, Abdelfettah
Turcq, Bruno
Albuquerque, Ana Luiza Spadano
Cardozo, A. Y. V.
Gomes, Doriedson Ferrreira
Silva, Eduardo Mendes da
Duque, S. R. E.
Rangel, J. O. Ch.
Sifeddine, Abdelfettah
Turcq, Bruno
Albuquerque, Ana Luiza Spadano
dc.subject.por.fl_str_mv Paleohydrology
Late Holocene
Diatoms
Sedimentary
Organic geochemistry
Lake Tota
topic Paleohydrology
Late Holocene
Diatoms
Sedimentary
Organic geochemistry
Lake Tota
description Texto completo: acesso restrito. p.127–136
publishDate 2014
dc.date.issued.fl_str_mv 2014
dc.date.accessioned.fl_str_mv 2015-03-27T20:17:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://repositorio.ufba.br/ri/handle/ri/17293
dc.identifier.issn.none.fl_str_mv 0031-0182
dc.identifier.number.pt_BR.fl_str_mv v. 415, n. 1
identifier_str_mv 0031-0182
v. 415, n. 1
url http://repositorio.ufba.br/ri/handle/ri/17293
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.country.fl_str_mv Brasil
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.palaeo.2014.03.013
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
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