Article (Scientific journals)
A new multi-proxy record of environmental change over the last 1000 years on Chiloé Island: Lake Pastahué, south-central Chile (42°S)
Troncoso Castro, J. M.; Vergara, C.; Alvarez, D. et al.
2019In Holocene, 29 (3), p. 421-431
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Keywords :
Chile; LIA; MCA
Abstract :
[en] Knowledge of past environmental and climatic conditions of lake ecosystems on Chiloé Island on a millennial scale is limited. Hence, this study fills a gap in our understanding of this part of southern Chile. The aim of this study was to reconstruct the environmental and climatic history of the last 1000 years of Lake Pastahué through a multi-proxy sediment core analysis. The 1-m-long core was subsampled every centimeter for the organic matter, magnetic susceptibility, grain-size distribution, and biological indicator (pollen, chironomids) analyses. The age model was constructed from 210Pb, 137Cs, and 14C activity. Pollen results revealed a North Patagonian forest composition represented by Nothofagus, Weinmannia, Drimys, Tepualia, Myrtaceae, Poaceae, and Pteridophyta. The abundance of Rumex and Pinus in the most recent part of the pollen assemblage reflects a clear anthropogenic impact. The sedimentological parameters and chironomid assemblage show similar variations, which highlight changes in the trophic state of the lake. The changes observed in all proxies suggest the influence of climate events such as the ‘Medieval Climate Anomaly’ (MCA) and ‘Little Ice Age’ (LIA). The variations observed since the beginning of the 20th century could be the result of the combined effect of anthropogenic activities and the increase in temperature recorded in south-central Chile and Patagonia. © The Author(s) 2018.
Research center :
Geology - GEOLOGY
Disciplines :
Earth sciences & physical geography
Author, co-author :
Troncoso Castro, J. M.;  School of Environmental Sciences, University of Concepción, Chile, Laboratory of Palynology and Plant Ecology, University of Concepción, Chile, School of Education and Social Sciences, Adventist University of Chile, Chile
Vergara, C.;  School of Environmental Sciences, University of Concepción, Chile
Alvarez, D.;  School of Environmental Sciences, University of Concepción, Chile, School of Science, Universidad Santo Tomás, Chile
Díaz, G.;  School of Environmental Sciences, University of Concepción, Chile
Fierro, P.;  Institute of Marine Science and Limnology, Austral University of Chile, Chile
Araneda, A.;  School of Environmental Sciences, University of Concepción, Chile
Torrejón, F.;  School of Environmental Sciences, University of Concepción, Chile
Rondanelli, M.;  Laboratory of Palynology and Plant Ecology, University of Concepción, Chile
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Urrutia, R.;  School of Environmental Sciences, University of Concepción, Chile
Language :
English
Title :
A new multi-proxy record of environmental change over the last 1000 years on Chiloé Island: Lake Pastahué, south-central Chile (42°S)
Publication date :
2019
Journal title :
Holocene
ISSN :
0959-6836
eISSN :
1477-0911
Publisher :
SAGE Publications Ltd
Volume :
29
Issue :
3
Pages :
421-431
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
WBI - Wallonie-Bruxelles International [BE]
Available on ORBi :
since 01 July 2019

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