Vegetation, disturbance, and climate history since the onset of ice-free conditions in the Lago Rosselot sector of Chiloe continental (44°S), northwestern Patagonia

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dc.contributor.authorMoreno, Patricio I.
dc.contributor.authorVidela, Javiera
dc.contributor.authorKaffman, Maria Jose
dc.contributor.authorHenriquez, Carla A.
dc.contributor.authorSagredo, Esteban A.
dc.contributor.authorJara-Arancio, Paola
dc.contributor.authorAlloway, Brent V.
dc.date.accessioned2025-01-20T22:21:41Z
dc.date.available2025-01-20T22:21:41Z
dc.date.issued2021
dc.description.abstractWe present results from Lago Negro, a small closed-basin lake adjacent to Lago Rosselot, to examine the vegetation and environmental history of an insufficiently studied sector of Chiloe Continental (41 degrees 30'-44 degrees S) in northwestern Patagonia. Lake sediment cores from Lago Negro reveal 27 tephra deposited since similar to 12.7 ka, including two prominent rhyodacite tephra marker beds erupted from Volcan Melimoyu, and a stratified basal clastic unit we attribute to meltwater discharge from an ice tongue that originated from Monte Queulat and covered Lago Rosselot during its expanded position, presumably Antarctic Cold Reversal in age. The pollen record shows closed-canopy North Patagonian rainforests since similar to 12.7 ka, with variations in species composition and structure that suggest dynamic responses of the vegetation to past environmental changes. Vegetation responses to climate in the Lago Negro record were modulated, sometimes interrupted, by high magnitude and frequent disturbance regimes, most notably during maxima in explosive volcanic activity (similar to 9.5-7.2 ka and similar to 3.6-1.6 ka) and heightened fire activity.
dc.description.abstractSince Lago Negro is the southernmost palynological site so far investigated in the region and is located within a volcanically active sector, it provides a valuable perspective for assessing past vegetation responses along environmental gradients since the last glaciation. When compared with other sites throughout northwestern Patagonia, our record reveals a distinct north-to-south gradient in temperature and precipitation, with peak temperature and rainfall seasonality in the north, and a west-to-east gradient in disturbance regimes, with maximum frequency and magnitude of explosive volcanic events in the east. These gradients have modulated the response of rainforest vegetation to climate forcing at regional scale since similar to 12.7 ka. We identify negligible differences in timing for the majority of key vegetation signals during the initial phase of the Lago Negro record, and propose that plant colonization and expansion along the similar to 360 km long corridor through the Pacific slope of the northwestern Patagonian Andes was a rapid process during the Last Glacial Termination. (C) 2021 Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.quascirev.2021.106924
dc.identifier.eissn1873-457X
dc.identifier.issn0277-3791
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2021.106924
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94657
dc.identifier.wosidWOS:000649726600003
dc.language.isoen
dc.revistaQuaternary science reviews
dc.rightsacceso restringido
dc.subjectVegetation and fire history
dc.subjectDisturbance paleoecology
dc.subjectPostglacial explosive volcanism
dc.subjectGlacier advance during the Antarctic Cold Reversal
dc.subjectRecession and stabilization during Younger Dryas
dc.subjectChiloe continental
dc.subjectNorthwestern Patagonia
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleVegetation, disturbance, and climate history since the onset of ice-free conditions in the Lago Rosselot sector of Chiloe continental (44°S), northwestern Patagonia
dc.typeartículo
dc.volumen260
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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