Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864
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Data de Publicação: | 2008 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Acta Scientiarum Biological Sciences |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5864 |
Resumo: | The samples from two profiles of flood plain deposits of the Paraná River were studied. One sample at the depth of 1.95 m was dated by 14C as 1,700 ± 70 yr BP. Palynological data and charcoal particles were obtained from fluvial sediments and paleosoil. Two principal stages in paleoenvironmental development were established. The early stage is characterized by the limited distribution of riparian forests and predominance of mesophyllous grassland under a condition of relatively dry climate. The deposition of charcoal particles in such predominant quantity was the result of local or regional burns. During the more recent stage, a natural enlargement of riparian forests occurred in conjunction with an increase in rainfall. Land use of that region may be confirmed by relatively frequent presence of pollen from cultivated, weed and introduced plants, encountered in sediments. The major frequency of charcoal particles occurred in the same samples was probably associated with anthropogenic activities during the last stage. |
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Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864Palinomorfos e partículas de carvões nos sedimentos holocênicos na região do alto rio Paraná e sua aplicação nas reconstruções paleoambientais e paleoclimáticas - DOI: 10.4025/actascibiolsci.v30i4.5864palynologycharcoalpalaeoenvironmentanthropogenic impactParaná riverpalinologiapartículas de carvãopaleoambienteimpacto antrópicorio Paraná.The samples from two profiles of flood plain deposits of the Paraná River were studied. One sample at the depth of 1.95 m was dated by 14C as 1,700 ± 70 yr BP. Palynological data and charcoal particles were obtained from fluvial sediments and paleosoil. Two principal stages in paleoenvironmental development were established. The early stage is characterized by the limited distribution of riparian forests and predominance of mesophyllous grassland under a condition of relatively dry climate. The deposition of charcoal particles in such predominant quantity was the result of local or regional burns. During the more recent stage, a natural enlargement of riparian forests occurred in conjunction with an increase in rainfall. Land use of that region may be confirmed by relatively frequent presence of pollen from cultivated, weed and introduced plants, encountered in sediments. The major frequency of charcoal particles occurred in the same samples was probably associated with anthropogenic activities during the last stage.Foram analisadas as amostras de dois perfis num horizonte de paleossolo da planície de inundação do rio Paraná, sendo processada uma datação pelo método 14C na profundidade de 1,95 m, atingindo idade de 1.700 ± 70 anos AP. Foram avaliados pólen e esporos de plantas terrestres juntamente com as partículas de carvão. Dois estágios, no desenvolvimento paleoambiental, foram estabelecidos com respeito ao desenvolvimento da vegetação. Um estágio mais antigo é caracterizado pela distribuição limitada das florestas ripárias e predomínio de campo nas condições de clima mais seco. Quantidade notável de partículas de carvão encontradas nas amostras deste estágio sugere ocorrência de queimadas locais ou regionais durante um clima seco. No estágio mais novo, a expansão das ripárias em resposta ao aumento das precipitações atmosféricas ocorreu. Pólen de plantas cultivadas, daninhas e invasoras, encontrado nos sedimentos, indica o desenvolvimento da agricultura neste estágio. Maior freqüência de partículas de carvão em mesmos sedimentos provavelmente indique ocorrência de queimadas locais associadas ao desmatamento da região.Universidade Estadual De Maringá2008-11-26info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/586410.4025/actascibiolsci.v30i4.5864Acta Scientiarum. Biological Sciences; Vol 30 No 4 (2008); 351-359Acta Scientiarum. Biological Sciences; v. 30 n. 4 (2008); 351-3591807-863X1679-9283reponame:Acta Scientiarum Biological Sciencesinstname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5864/5864Medeanik, SvetlanaStevaux, José Cândidoinfo:eu-repo/semantics/openAccess2022-11-23T17:33:49Zoai:periodicos.uem.br/ojs:article/5864Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSciPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/oai||actabiol@uem.br1807-863X1679-9283opendoar:2022-11-23T17:33:49Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 Palinomorfos e partículas de carvões nos sedimentos holocênicos na região do alto rio Paraná e sua aplicação nas reconstruções paleoambientais e paleoclimáticas - DOI: 10.4025/actascibiolsci.v30i4.5864 |
title |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
spellingShingle |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 Medeanik, Svetlana palynology charcoal palaeoenvironment anthropogenic impact Paraná river palinologia partículas de carvão paleoambiente impacto antrópico rio Paraná. |
title_short |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
title_full |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
title_fullStr |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
title_full_unstemmed |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
title_sort |
Palynomorphs and charcoal particles in Holocene sediments of the upper Paraná river area: paleoenvironmental and paleoclimatic reconstruction - DOI: 10.4025/actascibiolsci.v30i4.5864 |
author |
Medeanik, Svetlana |
author_facet |
Medeanik, Svetlana Stevaux, José Cândido |
author_role |
author |
author2 |
Stevaux, José Cândido |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Medeanik, Svetlana Stevaux, José Cândido |
dc.subject.por.fl_str_mv |
palynology charcoal palaeoenvironment anthropogenic impact Paraná river palinologia partículas de carvão paleoambiente impacto antrópico rio Paraná. |
topic |
palynology charcoal palaeoenvironment anthropogenic impact Paraná river palinologia partículas de carvão paleoambiente impacto antrópico rio Paraná. |
description |
The samples from two profiles of flood plain deposits of the Paraná River were studied. One sample at the depth of 1.95 m was dated by 14C as 1,700 ± 70 yr BP. Palynological data and charcoal particles were obtained from fluvial sediments and paleosoil. Two principal stages in paleoenvironmental development were established. The early stage is characterized by the limited distribution of riparian forests and predominance of mesophyllous grassland under a condition of relatively dry climate. The deposition of charcoal particles in such predominant quantity was the result of local or regional burns. During the more recent stage, a natural enlargement of riparian forests occurred in conjunction with an increase in rainfall. Land use of that region may be confirmed by relatively frequent presence of pollen from cultivated, weed and introduced plants, encountered in sediments. The major frequency of charcoal particles occurred in the same samples was probably associated with anthropogenic activities during the last stage. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-11-26 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5864 10.4025/actascibiolsci.v30i4.5864 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5864 |
identifier_str_mv |
10.4025/actascibiolsci.v30i4.5864 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5864/5864 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Biological Sciences; Vol 30 No 4 (2008); 351-359 Acta Scientiarum. Biological Sciences; v. 30 n. 4 (2008); 351-359 1807-863X 1679-9283 reponame:Acta Scientiarum Biological Sciences instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta Scientiarum Biological Sciences |
collection |
Acta Scientiarum Biological Sciences |
repository.name.fl_str_mv |
Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
||actabiol@uem.br |
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1799317394225627136 |