Fires and rates of change in the temperate rainforests of northwestern Patagonia since-18 ka

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dc.contributor.authorMoreno, Patricio, I
dc.contributor.authorMendez, Cesar
dc.contributor.authorHenriquez, Carla A.
dc.contributor.authorFercovic, Emilia, I
dc.contributor.authorVidela, Javiera
dc.contributor.authorReyes, Omar
dc.contributor.authorVillacis, Leonardo A.
dc.contributor.authorVilla-Martinez, Rodrigo
dc.contributor.authorAlloway, Brent, V
dc.date.accessioned2025-01-20T20:19:26Z
dc.date.available2025-01-20T20:19:26Z
dc.date.issued2023
dc.description.abstractWe examine the temporal and spatial structure of wildfires and rates of vegetation change in the Pacific sector of northwestern Patagonia (40 degrees-44 degrees S) over the last-18,000 years. Macroscopic Charcoal Accu-mulation Rates (CHAR), a proxy of past local fires, shows a geographic variation that mirrors the modern north-to-south and low-to-high elevation increase in annual precipitation and decrease in precipitation seasonality, and the frequency of explosive volcanic events. Variability in past fires is evident at multiple timescales, with a significant multi-millennial low between-18-13.1 ka, an abrupt rise between-13.1 -12.5 ka, and heightened fire activity between-11.4-8.2 ka with significant high values between-10 -9.4 ka. A subsequent decline led to the lowest Holocene values between-6-5.4 ka, which rose and led to significant high values between-3.1 ka and the present. Andean and Western Upwind Environments share a multi-millennial structure of fire activity since-18 ka, overprinted by millennial and centennial -scale divergences. These differences underscore the role of explosive volcanism as a trigger or modulator of fire activity in the vicinity of Andean eruptive centers. We posit that fire activity in Western Upwind Environments was driven primarily by hydroclimate variations, namely changes in the intensity of the Southern Westerly Winds. Compilations of CHAR and the Rates of Change (ROC) parameter, a measure of the magnitude and rapidity of changes in the pollen records, covary during the onset of the interglacial fire regime at-13.1 ka and the last-4000 years, suggesting that fires catalyzed vegetation changes during specific intervals since the last glaciation. Highly mobile human occupations deployed along the coasts started at-6.2 ka, increased in pulses, and spread widely during the last two millennia. Covariation with CHAR and ROC since-4 ka suggests that hunter-gatherer -fishers contributed to enhanced fire activity and abrupt vegetation changes at regional scale. The ubiquitous fire maximum over the last four cen-turies relates to widespread settlement and associated large-scale land clearance conducted by Euro-pean/Chilean settlers.(c) 2022 Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.quascirev.2022.107899
dc.identifier.eissn1873-457X
dc.identifier.issn0277-3791
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2022.107899
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92523
dc.identifier.wosidWOS:000906901700001
dc.language.isoen
dc.revistaQuaternary science reviews
dc.rightsacceso restringido
dc.subjectMacroscopic Charcoal Accumulation Rates
dc.subjectRates of vegetation change
dc.subjectTemperate rainforests
dc.subjectNorthwestern Patagonia
dc.subjectExplosive volcanism
dc.subjectHuman occupations
dc.subjectSouthern westerly winds
dc.subjectChilean
dc.subjectEuropean settlers
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleFires and rates of change in the temperate rainforests of northwestern Patagonia since-18 ka
dc.typeartículo
dc.volumen300
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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