Mostrar el registro sencillo del ítem
dc.contributor.author
Sepulveda Zunñiga, Einer
dc.contributor.author
Maidana, Nora Irene
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.contributor.author
Villacis, Leonardo
dc.contributor.author
Sagredo, Esteban A.
dc.contributor.author
Moreno, Patricio I.
dc.date.available
2023-09-12T13:54:18Z
dc.date.issued
2022-10
dc.identifier.citation
Sepulveda Zunñiga, Einer; Maidana, Nora Irene; Villacis, Leonardo; Sagredo, Esteban A.; Moreno, Patricio I.; The last millennium viewed from a fine-resolution freshwater diatom record from northwestern Patagonia; Pergamon-Elsevier Science Ltd; Quaternary Science Reviews; 296; 10-2022; 1-19
dc.identifier.issn
0277-3791
dc.identifier.uri
http://hdl.handle.net/11336/211230
dc.description.abstract
Little is known about the response of terrestrial and aquatic ecosystems to changes in climatic and human influences during the last millennium in northwestern Patagonia (NWP, 40°-44°S). By virtue of their sensitivity and specificity, diatoms are ideal for examining past changes in aquatic ecosystems and deciphering the ranges of variability under natural and human-induced conditions. To date, however, very few fossils diatom studies have examined in detail the environmental evolution during the last millennium throughout Patagonia. Here we present a fine-resolution diatom record from a lake-sediment core collected from Lago Pichilaguna (41°S), a closed-basin and shallow lake with a small catchment area located in the lowlands of the Chilean Lake District in NWP. The record spans the last millennium with a median time resolution of ∼12 years between samples, and shows abundant small Aulacoseira spp. between ∼1000-900 and ∼600-300 cal yr BP, which alternate in dominance with small fragilarioids and small raphid diatoms between ∼900-600 and ∼300-200 cal yr BP. A rapid shift to planktonic diatoms started at ∼200 cal yr BP and led to their modern dominance. We interpret centennial-scale changes in temperature, precipitation, and lake turbulence, with warm/dry/stratified phases between ∼1000-900 and ∼600-300 cal yr BP related to weak westerly winds, and intervals of cold/wet and mixed water column conditions between ∼900-600 and ∼300-200 cal yr BP, favored by stronger winds. The transition from periphytic to planktonic diatoms that started at ∼200 cal yr BP suggests juxtaposition of the warmest/driest phase of the last millennium and the onset of large-scale disturbance by Chilean/European settlers in NWP. Our results reveal that human disturbance during historical time surpassed the natural ranges of variability and resilience of aquatic and terrestrial ecosystems over the last millennium, generating abrupt changes in biodiversity, species composition, and community structure.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
LAKE SEDIMENT CORES
dc.subject
NORTHWESTERN PATAGONIA
dc.subject
PERIPHYTON
dc.subject
PLANKTONIC DIATOMS
dc.subject
SOUTHERN WESTERLY WINDS
dc.subject
TYCHOPLANKTONIC DIATOMS
dc.subject.classification
Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.title
The last millennium viewed from a fine-resolution freshwater diatom record from northwestern Patagonia
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-07-06T22:37:48Z
dc.journal.volume
296
dc.journal.pagination
1-19
dc.journal.pais
Estados Unidos
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Sepulveda Zunñiga, Einer. Pontificia Universidad Católica de Chile; Chile
dc.description.fil
Fil: Maidana, Nora Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina
dc.description.fil
Fil: Villacis, Leonardo. Universidad de Chile; Chile
dc.description.fil
Fil: Sagredo, Esteban A.. Pontificia Universidad Católica de Chile; Chile
dc.description.fil
Fil: Moreno, Patricio I.. Universidad de Chile; Chile
dc.journal.title
Quaternary Science Reviews
![Se ha confirmado la validez de este valor de autoridad por un usuario](/themes/CONICETDigital/images/authority_control/invisible.gif)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.quascirev.2022.107806
Archivos asociados