Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina

We interpret Holocene environmental conditions in a subantarctic high Andean valley from palynological and diatom analysis, peat stratigraphy, and local geomorphology. The multiproxy data from Las Cotorras mire (54° 41′ 13″ S; 68° 02′ 51″ W; 420 m a.s.l.) indicate the development of a soligenous mir...

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Detalles Bibliográficos
Autor principal: Maidana, Nora Irene
Publicado: 2010
Materias:
Holocene
Multi-proxy analyses
Paleoclimatic changes
Paleoenvironments
Tierra del Fuego
clastic sediment
depositional sequence
diatom
herb
mire
paleoclimate
paleoecology
paleoenvironment
palynology
peat
proxy climate record
sedge
Southern Hemisphere
succession
tephra
vegetation dynamics
vegetation history
water table
Argentina
Tierra del Fuego [(PRV) Argentina]
Bacillariophyta
Carex
Cyperaceae
Nothofagus
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v286_n1-2_p1_Borromei
http://hdl.handle.net/20.500.12110/paper_00310182_v286_n1-2_p1_Borromei
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00310182_v286_n1-2_p1_Borromei
record_format dspace
spelling paper:paper_00310182_v286_n1-2_p1_Borromei2023-06-08T14:56:38Z Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina Maidana, Nora Irene Holocene Multi-proxy analyses Paleoclimatic changes Paleoenvironments Tierra del Fuego clastic sediment depositional sequence diatom herb Holocene mire paleoclimate paleoecology paleoenvironment palynology peat proxy climate record sedge Southern Hemisphere succession tephra vegetation dynamics vegetation history water table Argentina Tierra del Fuego [(PRV) Argentina] Bacillariophyta Carex Cyperaceae Nothofagus We interpret Holocene environmental conditions in a subantarctic high Andean valley from palynological and diatom analysis, peat stratigraphy, and local geomorphology. The multiproxy data from Las Cotorras mire (54° 41′ 13″ S; 68° 02′ 51″ W; 420 m a.s.l.) indicate the development of a soligenous mire, as a result of a fine grained tephra layer deposition over the mineral soils sometime prior to 8000 cal yr BP. The paleoecological conditions in the mire after 8000 cal yr BP show a rapid succession from a limnic to a telmatic stage as the mire is colonized by sedges (Cyperaceae) and herbaceous communities. The upland vegetation changed from cushion and shrub heaths to an expansion of Nothofagus forest at high altitudes after 6500 cal yr BP. The peat is interbedded with clastic sediment that originates from mass wasting events or floods. These depositional changes affected the mire ecosystem water-table level and nutrient status (oligotrophic and/or eutrophic conditions). Maxima in total pollen influx at about 2800, 1100 and 700 cal yr BP coincide with heightened mineral flux, and these changes are related to precipitation and slope processes. The major vegetational change registered in the pollen record is the decline of Nothofagus pollen after 1000 cal yr BP, which reaches a minimum between ca. 680 and 300 cal yr BP. This minimum was likely caused by cool, wet conditions that coincided with the Little Ice Age (LIA) in the Southern Hemisphere. Our results indicate the sensitivity of subantarctic Nothofagus forest and mire ecosystems to changes during the Holocene. © 2009 Elsevier B.V. All rights reserved. Fil:Maidana, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v286_n1-2_p1_Borromei http://hdl.handle.net/20.500.12110/paper_00310182_v286_n1-2_p1_Borromei
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Holocene
Multi-proxy analyses
Paleoclimatic changes
Paleoenvironments
Tierra del Fuego
clastic sediment
depositional sequence
diatom
herb
Holocene
mire
paleoclimate
paleoecology
paleoenvironment
palynology
peat
proxy climate record
sedge
Southern Hemisphere
succession
tephra
vegetation dynamics
vegetation history
water table
Argentina
Tierra del Fuego [(PRV) Argentina]
Bacillariophyta
Carex
Cyperaceae
Nothofagus
spellingShingle Holocene
Multi-proxy analyses
Paleoclimatic changes
Paleoenvironments
Tierra del Fuego
clastic sediment
depositional sequence
diatom
herb
Holocene
mire
paleoclimate
paleoecology
paleoenvironment
palynology
peat
proxy climate record
sedge
Southern Hemisphere
succession
tephra
vegetation dynamics
vegetation history
water table
Argentina
Tierra del Fuego [(PRV) Argentina]
Bacillariophyta
Carex
Cyperaceae
Nothofagus
Maidana, Nora Irene
Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
topic_facet Holocene
Multi-proxy analyses
Paleoclimatic changes
Paleoenvironments
Tierra del Fuego
clastic sediment
depositional sequence
diatom
herb
Holocene
mire
paleoclimate
paleoecology
paleoenvironment
palynology
peat
proxy climate record
sedge
Southern Hemisphere
succession
tephra
vegetation dynamics
vegetation history
water table
Argentina
Tierra del Fuego [(PRV) Argentina]
Bacillariophyta
Carex
Cyperaceae
Nothofagus
description We interpret Holocene environmental conditions in a subantarctic high Andean valley from palynological and diatom analysis, peat stratigraphy, and local geomorphology. The multiproxy data from Las Cotorras mire (54° 41′ 13″ S; 68° 02′ 51″ W; 420 m a.s.l.) indicate the development of a soligenous mire, as a result of a fine grained tephra layer deposition over the mineral soils sometime prior to 8000 cal yr BP. The paleoecological conditions in the mire after 8000 cal yr BP show a rapid succession from a limnic to a telmatic stage as the mire is colonized by sedges (Cyperaceae) and herbaceous communities. The upland vegetation changed from cushion and shrub heaths to an expansion of Nothofagus forest at high altitudes after 6500 cal yr BP. The peat is interbedded with clastic sediment that originates from mass wasting events or floods. These depositional changes affected the mire ecosystem water-table level and nutrient status (oligotrophic and/or eutrophic conditions). Maxima in total pollen influx at about 2800, 1100 and 700 cal yr BP coincide with heightened mineral flux, and these changes are related to precipitation and slope processes. The major vegetational change registered in the pollen record is the decline of Nothofagus pollen after 1000 cal yr BP, which reaches a minimum between ca. 680 and 300 cal yr BP. This minimum was likely caused by cool, wet conditions that coincided with the Little Ice Age (LIA) in the Southern Hemisphere. Our results indicate the sensitivity of subantarctic Nothofagus forest and mire ecosystems to changes during the Holocene. © 2009 Elsevier B.V. All rights reserved.
author Maidana, Nora Irene
author_facet Maidana, Nora Irene
author_sort Maidana, Nora Irene
title Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
title_short Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
title_full Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
title_fullStr Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
title_full_unstemmed Multiproxy record of Holocene paleoenvironmental change, Tierra del Fuego, Argentina
title_sort multiproxy record of holocene paleoenvironmental change, tierra del fuego, argentina
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v286_n1-2_p1_Borromei
http://hdl.handle.net/20.500.12110/paper_00310182_v286_n1-2_p1_Borromei
work_keys_str_mv AT maidananorairene multiproxyrecordofholocenepaleoenvironmentalchangetierradelfuegoargentina
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