Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)

Marked environmental changes in the southern Patagonian steppe during the last 1100 years are detected by a multi-proxy study of radiocarbon-dated sediment cores from the crater lake Laguna Azul (52°05′S, 69°35′W). A prominent shift in carbon isotope records occurred between AD 1670 and AD 1890 indu...

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Guardado en:
Detalles Bibliográficos
Publicado: 2005
Materias:
Diatoms
Geochemistry
Lake sediments
Patagonia
Pollen
Stable isotopes
climate change
Holocene
paleoenvironment
proxy climate record
steppe
South America
Western Hemisphere
World
Bacillariophyta
Ovis aries
Rumex
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v228_n3-4_p203_Mayr
http://hdl.handle.net/20.500.12110/paper_00310182_v228_n3-4_p203_Mayr
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00310182_v228_n3-4_p203_Mayr
record_format dspace
spelling paper:paper_00310182_v228_n3-4_p203_Mayr2023-06-08T14:56:36Z Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina) Diatoms Geochemistry Lake sediments Patagonia Pollen Stable isotopes climate change Holocene paleoenvironment proxy climate record steppe Patagonia South America Western Hemisphere World Bacillariophyta Ovis aries Rumex Marked environmental changes in the southern Patagonian steppe during the last 1100 years are detected by a multi-proxy study of radiocarbon-dated sediment cores from the crater lake Laguna Azul (52°05′S, 69°35′W). A prominent shift in carbon isotope records occurred between AD 1670 and AD 1890 induced by a change to cooler climate conditions with a concurrent lake level rise. A second perturbation of the lake ecosystem started with a fire event around AD 1830. The fire event triggered increased soil erosion initiating a change of the diatom assemblages. This shift in diatom assemblages may have been enhanced by shrinkage of littoral habitats and higher nutrient supply in the course of permanent European settlement at the end of the 19th century. The introduction of neophytes by European sheep farmers is confirmed by the permanent occurrence of Rumex pollen in the sediment record since the beginning of the 20th century. © 2005 Elsevier B.V. All rights reserved. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v228_n3-4_p203_Mayr http://hdl.handle.net/20.500.12110/paper_00310182_v228_n3-4_p203_Mayr
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Diatoms
Geochemistry
Lake sediments
Patagonia
Pollen
Stable isotopes
climate change
Holocene
paleoenvironment
proxy climate record
steppe
Patagonia
South America
Western Hemisphere
World
Bacillariophyta
Ovis aries
Rumex
spellingShingle Diatoms
Geochemistry
Lake sediments
Patagonia
Pollen
Stable isotopes
climate change
Holocene
paleoenvironment
proxy climate record
steppe
Patagonia
South America
Western Hemisphere
World
Bacillariophyta
Ovis aries
Rumex
Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
topic_facet Diatoms
Geochemistry
Lake sediments
Patagonia
Pollen
Stable isotopes
climate change
Holocene
paleoenvironment
proxy climate record
steppe
Patagonia
South America
Western Hemisphere
World
Bacillariophyta
Ovis aries
Rumex
description Marked environmental changes in the southern Patagonian steppe during the last 1100 years are detected by a multi-proxy study of radiocarbon-dated sediment cores from the crater lake Laguna Azul (52°05′S, 69°35′W). A prominent shift in carbon isotope records occurred between AD 1670 and AD 1890 induced by a change to cooler climate conditions with a concurrent lake level rise. A second perturbation of the lake ecosystem started with a fire event around AD 1830. The fire event triggered increased soil erosion initiating a change of the diatom assemblages. This shift in diatom assemblages may have been enhanced by shrinkage of littoral habitats and higher nutrient supply in the course of permanent European settlement at the end of the 19th century. The introduction of neophytes by European sheep farmers is confirmed by the permanent occurrence of Rumex pollen in the sediment record since the beginning of the 20th century. © 2005 Elsevier B.V. All rights reserved.
title Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
title_short Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
title_full Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
title_fullStr Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
title_full_unstemmed Palaeoenvironmental changes in southern Patagonia during the last millennium recorded in lake sediments from Laguna Azul (Argentina)
title_sort palaeoenvironmental changes in southern patagonia during the last millennium recorded in lake sediments from laguna azul (argentina)
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v228_n3-4_p203_Mayr
http://hdl.handle.net/20.500.12110/paper_00310182_v228_n3-4_p203_Mayr
_version_ 1768544676176986112

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