Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin
We present new palynological information from the anoxic Cariaco Basin, off Venezuela, that provides insight into the response of northernmost South American vegetation to rapid climate changes between 68 and 28 ka, specifically during North Atlantic Heinrich events (HEs) and Dansgaard/Oeschger cycl...
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Cambridge University Press (CUP)
2008
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Online Access: | http://dx.doi.org/10.1016/j.yqres.2007.12.001 http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014447 |
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crcambridgeupr:10.1016/j.yqres.2007.12.001 2024-10-13T14:09:27+00:00 Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin González, Catalina Dupont, Lydie M. Behling, Hermann Wefer, Gerold 2008 http://dx.doi.org/10.1016/j.yqres.2007.12.001 http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014447 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 69, issue 2, page 217-230 ISSN 0033-5894 1096-0287 journal-article 2008 crcambridgeupr https://doi.org/10.1016/j.yqres.2007.12.001 2024-09-18T04:01:05Z We present new palynological information from the anoxic Cariaco Basin, off Venezuela, that provides insight into the response of northernmost South American vegetation to rapid climate changes between 68 and 28 ka, specifically during North Atlantic Heinrich events (HEs) and Dansgaard/Oeschger cycles. We defined three different vegetation modes: (1) an interstadial mode characterized by the highest pollen concentration and the maximum extension of semi-deciduous and evergreen forests; (2) a stadial mode characterized by increases of salt marshes, herbs, and montane forests; and (3) a Heinrich event mode characterized by the lowest pollen concentrations, abrupt increases of salt marshes, and decreased forest abundance. Similarly, indices of C4/C3 plants show increases during stadials with clear peaks during the onset of HEs, though grasslands did not become dominant during these periods. We alternatively propose that these expansions of C4 plants are associated with the expansion of coastal salt marshes. Our vegetation record suggests the prevalence of humid conditions during interstadials, dry and cold conditions during stadials, and dry and cold conditions together with changes in sea level during HEs. This new palynological evidence supports previous interpretations that main environmental changes in northernmost South America were driven by latitudinal displacements of the Intertropical Convergence Zone and sea-level changes. Article in Journal/Newspaper North Atlantic Cambridge University Press Quaternary Research 69 2 217 230 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
We present new palynological information from the anoxic Cariaco Basin, off Venezuela, that provides insight into the response of northernmost South American vegetation to rapid climate changes between 68 and 28 ka, specifically during North Atlantic Heinrich events (HEs) and Dansgaard/Oeschger cycles. We defined three different vegetation modes: (1) an interstadial mode characterized by the highest pollen concentration and the maximum extension of semi-deciduous and evergreen forests; (2) a stadial mode characterized by increases of salt marshes, herbs, and montane forests; and (3) a Heinrich event mode characterized by the lowest pollen concentrations, abrupt increases of salt marshes, and decreased forest abundance. Similarly, indices of C4/C3 plants show increases during stadials with clear peaks during the onset of HEs, though grasslands did not become dominant during these periods. We alternatively propose that these expansions of C4 plants are associated with the expansion of coastal salt marshes. Our vegetation record suggests the prevalence of humid conditions during interstadials, dry and cold conditions during stadials, and dry and cold conditions together with changes in sea level during HEs. This new palynological evidence supports previous interpretations that main environmental changes in northernmost South America were driven by latitudinal displacements of the Intertropical Convergence Zone and sea-level changes. |
format |
Article in Journal/Newspaper |
author |
González, Catalina Dupont, Lydie M. Behling, Hermann Wefer, Gerold |
spellingShingle |
González, Catalina Dupont, Lydie M. Behling, Hermann Wefer, Gerold Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
author_facet |
González, Catalina Dupont, Lydie M. Behling, Hermann Wefer, Gerold |
author_sort |
González, Catalina |
title |
Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
title_short |
Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
title_full |
Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
title_fullStr |
Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
title_full_unstemmed |
Neotropical vegetation response to rapid climate changes during the last glacial period: Palynological evidence from the Cariaco Basin |
title_sort |
neotropical vegetation response to rapid climate changes during the last glacial period: palynological evidence from the cariaco basin |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1016/j.yqres.2007.12.001 http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589407001500?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400014447 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Quaternary Research volume 69, issue 2, page 217-230 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2007.12.001 |
container_title |
Quaternary Research |
container_volume |
69 |
container_issue |
2 |
container_start_page |
217 |
op_container_end_page |
230 |
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1812816425859940352 |