The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes

Autores
Hyland, E. G.; Cotton, Jennifer M.; Ghosh, Adit; Hauswirth, S. C.; Littleton, S.; Azmi, Iffat; Insel, Nadja; Raigemborn, María Sol; Tineo, David
Año de publicación
2023
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The expansion of C4 grasses is one of the most dramatic ecological changes in the past 65 million years. Beginning in the late Miocene (~10-5 Ma), these tropical and subtropical grasses began to spread and now cover roughly 25% of the Earth´s surface. C4 grasses include economically and ecologically important crops, but the environmental conditions that drove this global expansion are poorly understood. In this study, we aim to determine the drivers of C4 grass expansion in central South America (Argentina). We hypothesize that this expansion was driven by the strengthening of the South American Summer Monsoon (SASM), which occurred as a result of regional climatic change related to local tectonic and global climatic processes. Using sedimentology/stratigraphy, paleopedology and geochemistry, phytolith and carbon isotope reconstructions, and biomarkers, we present paired reconstructions of environmental and climatic conditions and the abundance of C4 grasses across 7 sites in northern and central Argentina to assess the timing of this ecological transition in South America during the late Miocene-Pliocene. We find that in the absence of temperature and atmospheric CO2 changes, regional hydrologic change is likely the driver of C4 grass abundances in the Miocene. In northwest and central Argentina, our data suggests that increased precipitation seasonality brought about by the intensification of the South American Monsoon drove the expansion of C4 grasses, at least in the more humid regions. These results are supported by Community Earth System Model simulations that suggest an increase in summer precipitation along the eastern foothills of the Andes in Argentina between 8 and 3 Ma. Our data does not show a correlation between fire frequency and C4 grass abundance in Argentina, unlike other regions where this may drive the expansion. We also note that we only find moderate to high abundances of C4 grasses in areas where proxy-based precipitation estimates exceed ~500 mm/yr, and do not observe C4 grasses at sites with modern elevations higher than ~3,000 feet or behind rain shadows, showing that tectonically driven conditions are important controls on the distribution and spread of C4 grasses.
Fil: Hyland, E. G.. North Carolina State University; Estados Unidos
Fil: Cotton, Jennifer M.. California State University; Estados Unidos
Fil: Ghosh, Adit. University of Southern California; Estados Unidos
Fil: Hauswirth, S. C.. California State University; Estados Unidos
Fil: Littleton, S.. California State University; Estados Unidos
Fil: Azmi, Iffat. North Carolina State University; Estados Unidos
Fil: Insel, Nadja. Northeastern Illinois University (northeastern Illinois);
Fil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Tineo, David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología
La Plata
Argentina
Asociación Sedimentológica Argentina
Materia
C4 GRASSES
SOUTH AMERICAN SUMMER MONSOON
ARGENTINA
SEDIMENTS, PALEOSOLS, PHYTOLITHS AND ISOTOPES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/233992

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network_name_str CONICET Digital (CONICET)
spelling The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopesHyland, E. G.Cotton, Jennifer M.Ghosh, AditHauswirth, S. C.Littleton, S.Azmi, IffatInsel, NadjaRaigemborn, María SolTineo, DavidC4 GRASSESSOUTH AMERICAN SUMMER MONSOONARGENTINASEDIMENTS, PALEOSOLS, PHYTOLITHS AND ISOTOPEShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The expansion of C4 grasses is one of the most dramatic ecological changes in the past 65 million years. Beginning in the late Miocene (~10-5 Ma), these tropical and subtropical grasses began to spread and now cover roughly 25% of the Earth´s surface. C4 grasses include economically and ecologically important crops, but the environmental conditions that drove this global expansion are poorly understood. In this study, we aim to determine the drivers of C4 grass expansion in central South America (Argentina). We hypothesize that this expansion was driven by the strengthening of the South American Summer Monsoon (SASM), which occurred as a result of regional climatic change related to local tectonic and global climatic processes. Using sedimentology/stratigraphy, paleopedology and geochemistry, phytolith and carbon isotope reconstructions, and biomarkers, we present paired reconstructions of environmental and climatic conditions and the abundance of C4 grasses across 7 sites in northern and central Argentina to assess the timing of this ecological transition in South America during the late Miocene-Pliocene. We find that in the absence of temperature and atmospheric CO2 changes, regional hydrologic change is likely the driver of C4 grass abundances in the Miocene. In northwest and central Argentina, our data suggests that increased precipitation seasonality brought about by the intensification of the South American Monsoon drove the expansion of C4 grasses, at least in the more humid regions. These results are supported by Community Earth System Model simulations that suggest an increase in summer precipitation along the eastern foothills of the Andes in Argentina between 8 and 3 Ma. Our data does not show a correlation between fire frequency and C4 grass abundance in Argentina, unlike other regions where this may drive the expansion. We also note that we only find moderate to high abundances of C4 grasses in areas where proxy-based precipitation estimates exceed ~500 mm/yr, and do not observe C4 grasses at sites with modern elevations higher than ~3,000 feet or behind rain shadows, showing that tectonically driven conditions are important controls on the distribution and spread of C4 grasses.Fil: Hyland, E. G.. North Carolina State University; Estados UnidosFil: Cotton, Jennifer M.. California State University; Estados UnidosFil: Ghosh, Adit. University of Southern California; Estados UnidosFil: Hauswirth, S. C.. California State University; Estados UnidosFil: Littleton, S.. California State University; Estados UnidosFil: Azmi, Iffat. North Carolina State University; Estados UnidosFil: Insel, Nadja. Northeastern Illinois University (northeastern Illinois);Fil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Tineo, David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaXVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de SedimentologíaLa PlataArgentinaAsociación Sedimentológica ArgentinaAsociación Sedimentológica ArgentinaLizzoli, SabrinaIsla, Manuel FermínLópez, ManuelMoyano Paz, DamiánRaigemborn, María Sol2023info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/233992The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 32-32978-631-90299-0-1CONICET DigitalCONICETengNacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:47:22Zoai:ri.conicet.gov.ar:11336/233992instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:47:22.823CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
title The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
spellingShingle The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
Hyland, E. G.
C4 GRASSES
SOUTH AMERICAN SUMMER MONSOON
ARGENTINA
SEDIMENTS, PALEOSOLS, PHYTOLITHS AND ISOTOPES
title_short The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
title_full The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
title_fullStr The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
title_full_unstemmed The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
title_sort The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes
dc.creator.none.fl_str_mv Hyland, E. G.
Cotton, Jennifer M.
Ghosh, Adit
Hauswirth, S. C.
Littleton, S.
Azmi, Iffat
Insel, Nadja
Raigemborn, María Sol
Tineo, David
author Hyland, E. G.
author_facet Hyland, E. G.
Cotton, Jennifer M.
Ghosh, Adit
Hauswirth, S. C.
Littleton, S.
Azmi, Iffat
Insel, Nadja
Raigemborn, María Sol
Tineo, David
author_role author
author2 Cotton, Jennifer M.
Ghosh, Adit
Hauswirth, S. C.
Littleton, S.
Azmi, Iffat
Insel, Nadja
Raigemborn, María Sol
Tineo, David
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Lizzoli, Sabrina
Isla, Manuel Fermín
López, Manuel
Moyano Paz, Damián
Raigemborn, María Sol
dc.subject.none.fl_str_mv C4 GRASSES
SOUTH AMERICAN SUMMER MONSOON
ARGENTINA
SEDIMENTS, PALEOSOLS, PHYTOLITHS AND ISOTOPES
topic C4 GRASSES
SOUTH AMERICAN SUMMER MONSOON
ARGENTINA
SEDIMENTS, PALEOSOLS, PHYTOLITHS AND ISOTOPES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The expansion of C4 grasses is one of the most dramatic ecological changes in the past 65 million years. Beginning in the late Miocene (~10-5 Ma), these tropical and subtropical grasses began to spread and now cover roughly 25% of the Earth´s surface. C4 grasses include economically and ecologically important crops, but the environmental conditions that drove this global expansion are poorly understood. In this study, we aim to determine the drivers of C4 grass expansion in central South America (Argentina). We hypothesize that this expansion was driven by the strengthening of the South American Summer Monsoon (SASM), which occurred as a result of regional climatic change related to local tectonic and global climatic processes. Using sedimentology/stratigraphy, paleopedology and geochemistry, phytolith and carbon isotope reconstructions, and biomarkers, we present paired reconstructions of environmental and climatic conditions and the abundance of C4 grasses across 7 sites in northern and central Argentina to assess the timing of this ecological transition in South America during the late Miocene-Pliocene. We find that in the absence of temperature and atmospheric CO2 changes, regional hydrologic change is likely the driver of C4 grass abundances in the Miocene. In northwest and central Argentina, our data suggests that increased precipitation seasonality brought about by the intensification of the South American Monsoon drove the expansion of C4 grasses, at least in the more humid regions. These results are supported by Community Earth System Model simulations that suggest an increase in summer precipitation along the eastern foothills of the Andes in Argentina between 8 and 3 Ma. Our data does not show a correlation between fire frequency and C4 grass abundance in Argentina, unlike other regions where this may drive the expansion. We also note that we only find moderate to high abundances of C4 grasses in areas where proxy-based precipitation estimates exceed ~500 mm/yr, and do not observe C4 grasses at sites with modern elevations higher than ~3,000 feet or behind rain shadows, showing that tectonically driven conditions are important controls on the distribution and spread of C4 grasses.
Fil: Hyland, E. G.. North Carolina State University; Estados Unidos
Fil: Cotton, Jennifer M.. California State University; Estados Unidos
Fil: Ghosh, Adit. University of Southern California; Estados Unidos
Fil: Hauswirth, S. C.. California State University; Estados Unidos
Fil: Littleton, S.. California State University; Estados Unidos
Fil: Azmi, Iffat. North Carolina State University; Estados Unidos
Fil: Insel, Nadja. Northeastern Illinois University (northeastern Illinois);
Fil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Tineo, David. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología
La Plata
Argentina
Asociación Sedimentológica Argentina
description The expansion of C4 grasses is one of the most dramatic ecological changes in the past 65 million years. Beginning in the late Miocene (~10-5 Ma), these tropical and subtropical grasses began to spread and now cover roughly 25% of the Earth´s surface. C4 grasses include economically and ecologically important crops, but the environmental conditions that drove this global expansion are poorly understood. In this study, we aim to determine the drivers of C4 grass expansion in central South America (Argentina). We hypothesize that this expansion was driven by the strengthening of the South American Summer Monsoon (SASM), which occurred as a result of regional climatic change related to local tectonic and global climatic processes. Using sedimentology/stratigraphy, paleopedology and geochemistry, phytolith and carbon isotope reconstructions, and biomarkers, we present paired reconstructions of environmental and climatic conditions and the abundance of C4 grasses across 7 sites in northern and central Argentina to assess the timing of this ecological transition in South America during the late Miocene-Pliocene. We find that in the absence of temperature and atmospheric CO2 changes, regional hydrologic change is likely the driver of C4 grass abundances in the Miocene. In northwest and central Argentina, our data suggests that increased precipitation seasonality brought about by the intensification of the South American Monsoon drove the expansion of C4 grasses, at least in the more humid regions. These results are supported by Community Earth System Model simulations that suggest an increase in summer precipitation along the eastern foothills of the Andes in Argentina between 8 and 3 Ma. Our data does not show a correlation between fire frequency and C4 grass abundance in Argentina, unlike other regions where this may drive the expansion. We also note that we only find moderate to high abundances of C4 grasses in areas where proxy-based precipitation estimates exceed ~500 mm/yr, and do not observe C4 grasses at sites with modern elevations higher than ~3,000 feet or behind rain shadows, showing that tectonically driven conditions are important controls on the distribution and spread of C4 grasses.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/233992
The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 32-32
978-631-90299-0-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/233992
identifier_str_mv The rise of C4 grasses in Argentina: Linking grassland transition to the South American summer Monsoon using sediments, paleosols, phytoliths and isotopes; XVIII Reunión Argentina de Sedimentología y IX Congreso Latinoamericano de Sedimentología; La Plata; Argentina; 2023; 32-32
978-631-90299-0-1
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Nacional
dc.publisher.none.fl_str_mv Asociación Sedimentológica Argentina
publisher.none.fl_str_mv Asociación Sedimentológica Argentina
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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