Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event

The Paleocene-Eocene Thermal Maximum (PETM) is recognized by an increase in global temperatures of ~5ºC over a period of 10 to 20 ka. This warming is associated with a marked global decreasing in the carbon isotope (ä13C) signal, that has been recorded both in marine and terrestrial environments. We...

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Autores principales: Ochoa Lozano, D., Jaramillo, Carlos
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Paleógeno
Polen
Fósiles
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16640
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16640
record_format dspace
spelling I19-R120-10915-166402023-09-29T20:02:21Z http://sedici.unlp.edu.ar/handle/10915/16640 Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event Ochoa Lozano, D. Jaramillo, Carlos 2010 2010 2010-11-09T03:00:00Z en Ciencias Naturales Paleontología Paleógeno Polen Fósiles The Paleocene-Eocene Thermal Maximum (PETM) is recognized by an increase in global temperatures of ~5ºC over a period of 10 to 20 ka. This warming is associated with a marked global decreasing in the carbon isotope (ä13C) signal, that has been recorded both in marine and terrestrial environments. We analyzed pollen floras from sections across the PETM in eastern Colombia and western Venezuela. The floral patterns and behaviours were analyzed through several statistical techniques, including rarefaction, cluster analysis, origination and extinction index, and range-through. Also, carbon isotope analyses were used to identify the PETM interval within the sections. Our results strongly suggest a marked increase in diversity, and a considerable change in flora composition during the PETM. These variations in the flora seem to occur in two phases. The lower half of the PETM is characterized by extinction of many Paleocene taxa (~ 35%), in association with a major increase in origination. The upper half of the PETM is characterized by a larger number of originations and low number of extinctions. In summary, the PETM interval is associated with a rapid increase in the number of species added to the Paleocene flora rather than extinction events. These patterns suggest that this fast global warming, 55 millon years ago, was a major factor in enhancing the tropical diversity. A possible scenario for this significant increase in diversity may be related to a combination of high levels of precipitation and CO2 concentrations; both factors could help tropical plants to survive under elevated temperatures. Simposio II: El Paleógeno de América del Sur y Central Facultad de Ciencias Naturales y Museo Objeto de conferencia Resumen http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Paleógeno
Polen
Fósiles
spellingShingle Ciencias Naturales
Paleontología
Paleógeno
Polen
Fósiles
Ochoa Lozano, D.
Jaramillo, Carlos
Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
topic_facet Ciencias Naturales
Paleontología
Paleógeno
Polen
Fósiles
description The Paleocene-Eocene Thermal Maximum (PETM) is recognized by an increase in global temperatures of ~5ºC over a period of 10 to 20 ka. This warming is associated with a marked global decreasing in the carbon isotope (ä13C) signal, that has been recorded both in marine and terrestrial environments. We analyzed pollen floras from sections across the PETM in eastern Colombia and western Venezuela. The floral patterns and behaviours were analyzed through several statistical techniques, including rarefaction, cluster analysis, origination and extinction index, and range-through. Also, carbon isotope analyses were used to identify the PETM interval within the sections. Our results strongly suggest a marked increase in diversity, and a considerable change in flora composition during the PETM. These variations in the flora seem to occur in two phases. The lower half of the PETM is characterized by extinction of many Paleocene taxa (~ 35%), in association with a major increase in origination. The upper half of the PETM is characterized by a larger number of originations and low number of extinctions. In summary, the PETM interval is associated with a rapid increase in the number of species added to the Paleocene flora rather than extinction events. These patterns suggest that this fast global warming, 55 millon years ago, was a major factor in enhancing the tropical diversity. A possible scenario for this significant increase in diversity may be related to a combination of high levels of precipitation and CO2 concentrations; both factors could help tropical plants to survive under elevated temperatures.
format Objeto de conferencia
Resumen
author Ochoa Lozano, D.
Jaramillo, Carlos
author_facet Ochoa Lozano, D.
Jaramillo, Carlos
author_sort Ochoa Lozano, D.
title Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
title_short Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
title_full Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
title_fullStr Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
title_full_unstemmed Significant shift in Neotropical plant diversity during the Paleocene-Eocene Thermal Maximum Event
title_sort significant shift in neotropical plant diversity during the paleocene-eocene thermal maximum event
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16640
work_keys_str_mv AT ochoalozanod significantshiftinneotropicalplantdiversityduringthepaleoceneeocenethermalmaximumevent
AT jaramillocarlos significantshiftinneotropicalplantdiversityduringthepaleoceneeocenethermalmaximumevent
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