Paleolimnology of Lago Pichilaguna over the past 12,600 years based on a fine-resolution diatom record, northwestern Patagonia (41°S)

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dc.catalogadorgjm
dc.contributor.authorSepúlveda-Zúñiga, E. A.
dc.contributor.authorVillacis, L. A.
dc.contributor.authorMaidana, N. I.
dc.contributor.authorSagredo T., Esteban
dc.contributor.authorMoreno, P. I.
dc.date.accessioned2024-12-30T13:07:23Z
dc.date.available2024-12-30T13:07:23Z
dc.date.issued2024
dc.description.abstractThe Pacific sector of Northwestern Patagonia (NWP, 40 degrees-44 degrees S) is key for examining the interaction between climate variability, explosive volcanism, and human influences on southern mid-latitude ecosystems. A limited number of studies in this region, however, have focused on aquatic ecosystem and hydrologic balance (HB) changes throughout the Holocene. Here we report a fossil diatom record from Lago Pichilaguna, a small closedbasin lake located in the lowlands of the Chilean Lake District, that reveals prominent changes in species composition and functional groups since 12.6 cal ka BP. We interpret positive HB between 12.6-11.4 cal ka BP and from 5.7 cal ka BP until recent that alternate with negative HB between 11.4-6.9 cal ka BP. We observe centennial-scale fluctuations since 5.7 cal ka BP that culminate with a negative HB phase over the past 270 years. Coherent responses in terrestrial and aquatic ecosystems recorded in the Lago Pichilaguna sediments underscore the influence of variations in the Southern Westerly Winds in NWP from multimillennial to centennial timescales since 12.6 cal ka BP. These inferences replicate the timing and direction of changes from previous studies at regional, pan-Patagonian, and zonal scales. The magnitude and rapidity of changes in diatom assemblages that started at 0.2 cal ka BP exceeds the ranges of local natural variability since 12.6 cal ka BP. This abrupt change is associated with a negative HB phase at centennial timescale, deposition of a tephra layer, and large-scale disturbance by Chilean/European settlers.
dc.format.extent15 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.quascirev.2024.108835
dc.identifier.eissn1873-457X
dc.identifier.issn0277-3791
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2024.108835
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89352
dc.identifier.wosidWOS:001280020700001
dc.information.autorucInstituto de Geografía; Sagredo T., Esteban; 0000-0002-4494-5423; 16924
dc.language.isoen
dc.nota.accesocontenido parcial
dc.revistaQuaternary Science Reviews
dc.rightsacceso restringido
dc.subjectFreshwater diatoms
dc.subjectPeriphyton
dc.subjectPlanktonic diatoms
dc.subjectTychoplanktonic diatoms
dc.subjectNorthwestern patagonia
dc.subjectSouthern westerly winds
dc.subjectHolocene
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.subject.ods13 Climate action
dc.subject.ods14 Life below water
dc.subject.odspa13 Acción por el clima
dc.subject.odspa14 Vida submarina
dc.titlePaleolimnology of Lago Pichilaguna over the past 12,600 years based on a fine-resolution diatom record, northwestern Patagonia (41°S)
dc.typeartículo
dc.volumen339
sipa.codpersvinculados16924
sipa.trazabilidadWOS;2024-08-17
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