Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka

Autores
Moreno, Patricio I.; Vilanova, Isabel; Villa Martínez, Rodrigo P.; Francois, Jean P.
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The degree to which vegetation and site type have influenced fire regimes through the Holocene has not been investigated in detail in the temperate ecosystems of southern Patagonia. Here we present a first attempt using a paired-basin approach to study the evolution of fire regimes in sectors dominated by humid Nothofagus forests and the xeric Patagonian steppe in the Magallanes region of Chilean Patagonia (51°S). We analyzed sediment cores from two small lakes and a bog located within the same climate zone on opposite sides of the forest-steppe ecotone, ~28 km apart. The position of this biological boundary east of the Andes is controlled by the strength and position of the southern westerly winds, which constitute the sole source of precipitation throughout western Patagonia. Our results indicate that fires have occurred in the study region repeated times over the last ~13,000 years at bi- and tridecadal timescales. Sectors currently dominated by Patagonian steppe feature high frequency and low magnitude of local fires, and vice versa in humid forests. Climate-driven expansion of Nothofagus scrubland/woodland into steppe environments over the last ~4,200 years increased the magnitude and lowered the frequency of fire events, culminating with peak Nothofagus abundance, fire magnitude and frequency during the last millennium. We also detect divergences between lake-based vs. bog-based paleofire histories among paired sites located within the Patagonian steppe, ~12 km apart, which we attribute to local burning of the bog at times of lowered water table. This divergence suggests to us that bog-based vegetation and fire histories exacerbate a local, azonal, signal blurring extra-local or regional regimes, thus accounting for some discrepancies in the Quaternary paleovegetation/paleoclimate literature of southern Patagonia.
Fil: Moreno, Patricio I.. Universidad de Chile; Chile
Fil: Vilanova, Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina
Fil: Villa Martínez, Rodrigo P.. Universidad de Magallanes; Chile
Fil: Francois, Jean P.. Universidad de Playa Ancha; Chile
Materia
FIRE REGIME
LAKE SEDIMENTS
PALEOCLIMATE
PATAGONIA
VEGETATION DYNAMICS
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:11336/93936
Acceder
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spelling Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 kaMoreno, Patricio I.Vilanova, IsabelVilla Martínez, Rodrigo P.Francois, Jean P.FIRE REGIMELAKE SEDIMENTSPALEOCLIMATEPATAGONIAVEGETATION DYNAMICShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The degree to which vegetation and site type have influenced fire regimes through the Holocene has not been investigated in detail in the temperate ecosystems of southern Patagonia. Here we present a first attempt using a paired-basin approach to study the evolution of fire regimes in sectors dominated by humid Nothofagus forests and the xeric Patagonian steppe in the Magallanes region of Chilean Patagonia (51°S). We analyzed sediment cores from two small lakes and a bog located within the same climate zone on opposite sides of the forest-steppe ecotone, ~28 km apart. The position of this biological boundary east of the Andes is controlled by the strength and position of the southern westerly winds, which constitute the sole source of precipitation throughout western Patagonia. Our results indicate that fires have occurred in the study region repeated times over the last ~13,000 years at bi- and tridecadal timescales. Sectors currently dominated by Patagonian steppe feature high frequency and low magnitude of local fires, and vice versa in humid forests. Climate-driven expansion of Nothofagus scrubland/woodland into steppe environments over the last ~4,200 years increased the magnitude and lowered the frequency of fire events, culminating with peak Nothofagus abundance, fire magnitude and frequency during the last millennium. We also detect divergences between lake-based vs. bog-based paleofire histories among paired sites located within the Patagonian steppe, ~12 km apart, which we attribute to local burning of the bog at times of lowered water table. This divergence suggests to us that bog-based vegetation and fire histories exacerbate a local, azonal, signal blurring extra-local or regional regimes, thus accounting for some discrepancies in the Quaternary paleovegetation/paleoclimate literature of southern Patagonia.Fil: Moreno, Patricio I.. Universidad de Chile; ChileFil: Vilanova, Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; ArgentinaFil: Villa Martínez, Rodrigo P.. Universidad de Magallanes; ChileFil: Francois, Jean P.. Universidad de Playa Ancha; ChileFrontiers Media SA2018-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/93936Moreno, Patricio I.; Vilanova, Isabel; Villa Martínez, Rodrigo P.; Francois, Jean P.; Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka; Frontiers Media SA; Frontiers in Ecology and Evolution; 6; 34; 4-2018; 1-102296-701XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://journal.frontiersin.org/article/10.3389/fevo.2018.00034/fullinfo:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2018.00034info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:07:36Zoai:ri.conicet.gov.ar:11336/93936instacron: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:34982025-09-03 10:07:36.993CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
title Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
spellingShingle Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
Moreno, Patricio I.
FIRE REGIME
LAKE SEDIMENTS
PALEOCLIMATE
PATAGONIA
VEGETATION DYNAMICS
title_short Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
title_full Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
title_fullStr Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
title_full_unstemmed Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
title_sort Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka
dc.creator.none.fl_str_mv Moreno, Patricio I.
Vilanova, Isabel
Villa Martínez, Rodrigo P.
Francois, Jean P.
author Moreno, Patricio I.
author_facet Moreno, Patricio I.
Vilanova, Isabel
Villa Martínez, Rodrigo P.
Francois, Jean P.
author_role author
author2 Vilanova, Isabel
Villa Martínez, Rodrigo P.
Francois, Jean P.
author2_role author
author
author
dc.subject.none.fl_str_mv FIRE REGIME
LAKE SEDIMENTS
PALEOCLIMATE
PATAGONIA
VEGETATION DYNAMICS
topic FIRE REGIME
LAKE SEDIMENTS
PALEOCLIMATE
PATAGONIA
VEGETATION DYNAMICS
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 degree to which vegetation and site type have influenced fire regimes through the Holocene has not been investigated in detail in the temperate ecosystems of southern Patagonia. Here we present a first attempt using a paired-basin approach to study the evolution of fire regimes in sectors dominated by humid Nothofagus forests and the xeric Patagonian steppe in the Magallanes region of Chilean Patagonia (51°S). We analyzed sediment cores from two small lakes and a bog located within the same climate zone on opposite sides of the forest-steppe ecotone, ~28 km apart. The position of this biological boundary east of the Andes is controlled by the strength and position of the southern westerly winds, which constitute the sole source of precipitation throughout western Patagonia. Our results indicate that fires have occurred in the study region repeated times over the last ~13,000 years at bi- and tridecadal timescales. Sectors currently dominated by Patagonian steppe feature high frequency and low magnitude of local fires, and vice versa in humid forests. Climate-driven expansion of Nothofagus scrubland/woodland into steppe environments over the last ~4,200 years increased the magnitude and lowered the frequency of fire events, culminating with peak Nothofagus abundance, fire magnitude and frequency during the last millennium. We also detect divergences between lake-based vs. bog-based paleofire histories among paired sites located within the Patagonian steppe, ~12 km apart, which we attribute to local burning of the bog at times of lowered water table. This divergence suggests to us that bog-based vegetation and fire histories exacerbate a local, azonal, signal blurring extra-local or regional regimes, thus accounting for some discrepancies in the Quaternary paleovegetation/paleoclimate literature of southern Patagonia.
Fil: Moreno, Patricio I.. Universidad de Chile; Chile
Fil: Vilanova, Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina
Fil: Villa Martínez, Rodrigo P.. Universidad de Magallanes; Chile
Fil: Francois, Jean P.. Universidad de Playa Ancha; Chile
description The degree to which vegetation and site type have influenced fire regimes through the Holocene has not been investigated in detail in the temperate ecosystems of southern Patagonia. Here we present a first attempt using a paired-basin approach to study the evolution of fire regimes in sectors dominated by humid Nothofagus forests and the xeric Patagonian steppe in the Magallanes region of Chilean Patagonia (51°S). We analyzed sediment cores from two small lakes and a bog located within the same climate zone on opposite sides of the forest-steppe ecotone, ~28 km apart. The position of this biological boundary east of the Andes is controlled by the strength and position of the southern westerly winds, which constitute the sole source of precipitation throughout western Patagonia. Our results indicate that fires have occurred in the study region repeated times over the last ~13,000 years at bi- and tridecadal timescales. Sectors currently dominated by Patagonian steppe feature high frequency and low magnitude of local fires, and vice versa in humid forests. Climate-driven expansion of Nothofagus scrubland/woodland into steppe environments over the last ~4,200 years increased the magnitude and lowered the frequency of fire events, culminating with peak Nothofagus abundance, fire magnitude and frequency during the last millennium. We also detect divergences between lake-based vs. bog-based paleofire histories among paired sites located within the Patagonian steppe, ~12 km apart, which we attribute to local burning of the bog at times of lowered water table. This divergence suggests to us that bog-based vegetation and fire histories exacerbate a local, azonal, signal blurring extra-local or regional regimes, thus accounting for some discrepancies in the Quaternary paleovegetation/paleoclimate literature of southern Patagonia.
publishDate 2018
dc.date.none.fl_str_mv 2018-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/93936
Moreno, Patricio I.; Vilanova, Isabel; Villa Martínez, Rodrigo P.; Francois, Jean P.; Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka; Frontiers Media SA; Frontiers in Ecology and Evolution; 6; 34; 4-2018; 1-10
2296-701X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/93936
identifier_str_mv Moreno, Patricio I.; Vilanova, Isabel; Villa Martínez, Rodrigo P.; Francois, Jean P.; Modulation of Fire Regimes by Vegetation and Site Type in Southwestern Patagonia Since 13 ka; Frontiers Media SA; Frontiers in Ecology and Evolution; 6; 34; 4-2018; 1-10
2296-701X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://journal.frontiersin.org/article/10.3389/fevo.2018.00034/full
info:eu-repo/semantics/altIdentifier/doi/10.3389/fevo.2018.00034
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.publisher.none.fl_str_mv Frontiers Media SA
publisher.none.fl_str_mv Frontiers Media SA
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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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score 13.13397

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