Vegetation and climate change, fire-regime shifts and volcanic disturbance in Chiloé Continental (43°S) during the last 10,000 years

Henríquez, W.I.; Moreno, Patricio I.; Alloway, Brent V.; Villarosa, Gustavo

doi:10.1016/j.quascirev.2015.06.017

Cited by 28 publications

(17 citation statements)

References 35 publications

(43 reference statements)

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“…This was manifest as a shift towards lower/higher relative values of Araucaria/Nothofagus. Our results are consistent with the study of Veblen (1982), who performed a detailed ecological analysis of Araucaria-Nothofagus forests that concluded that repeated small-scale disturbance from volcanic ash-fall favours the relatively fast-growing Nothofagus relative to Araucaria, a result that is consistent with our findings, and with long-term (palaeoecological) studies on the role of tephra of other forest types, both within southern South America (Henríquez et al, 2015;Jara & Moreno, 2012) and further afield (Wilmshurst & McGlone, 1996).…”

Section: The Long-term Role Of Volcanic Ash-fallsupporting

confidence: 93%

Centennial and millennial‐scale dynamics inAraucaria–Nothofagusforests in the southern Andes

Dickson

Fletcher

Hall

et al. 2020

Journal of Biogeography

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Aim: To assess the relative roles of long-term (millennial-scale) climatic change, fire and volcanic disturbance on the dynamics of Araucaria-Nothofagus forests of southcentral Chile. Through this analysis, we provide insight into how these iconic ecosystems may respond to future ash-fall events under anticipated changes to climate and burning regimes. Location: Lago Cilantro is a small lake located in south-central Chile (38°51′36.72 S, 71°17′14.52 W, 1,400 m asl), proximal to several active volcanos within the Southern Volcanic Zone of the Andes Mountain range. Taxon: Araucaria araucana (Araucariaceae); Nothofagus spp. (Nothofagaceae). Methods: We developed a continuous 8,700-year long pollen and charcoal record from Lago Cilantro. We compared these results with proxies of regional climatic change and used a combination of principal component analysis and superposed epoch analysis to test the relationship between tephra deposition and pollen composition. Results: We detect a shift in dominance from Araucaria araucana to Nothofagus species between ~8.7 and ~5.5 ka (ka = 1,000 years before present-1950 CE), in concert with increasing regional precipitation and decreasing local-scale fire activity. A reversal in this trend occurred after ~4 ka, contemporaneous with a reduction in regional precipitation. Centennial-scale increases in Araucaria araucana from ~0.2 to 0.9 ka, ~5.2 to 4.2 ka and ~8.6 to 7 ka are associated with reductions in fire return intervals. We found 24 tephra layers in this record; tephra >2 cm thickness are associated with short-term (<100 year) compositional shifts in the pollen spectra, while a single large (255 cm) tephra at ~3 ka is associated with a substantial reduction in Nothofagus and no change in Araucaria. Main Conclusions: Climate change drove millennial-scale shifts in Araucaria-Nothofagus forests and fire regimes near Lago Cilantro. A shortening of the fire return interval is associated with an increase in the importance of Araucaria, supporting the notion that recurrent fires are required to allow this tree species to compete with

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Section: The Long-term Role Of Volcanic Ash-fallsupporting

confidence: 93%

Centennial and millennial‐scale dynamics inAraucaria–Nothofagusforests in the southern Andes

Dickson

Fletcher

Hall

et al. 2020

Journal of Biogeography

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“…Presently, there is no satisfactory mechanism to adequately explain the timing of this local glacial maximum, although possible explanations include regional insolation and coupled ocean-atmosphere interactions, including the influence of the southern westerly winds, sea surface temperatures, Southern Ocean stratification and Antarctic sea ice extent (Darvill et al, 2015a(Darvill et al, , 2016Moreno et al, 2015;. Compared to the LLGM, the onset of deglaciation is more closely coupled throughout Patagonia and centered at 17.8 ka with some local variation, which is concurrent with warming of the mid to high latitudes in the Southern Hemisphere (Kaplan et al, 2004(Kaplan et al, , 2007 J o u r n a l P r e -p r o o f 2005a; Douglass et al, 2006;Hein et al, 2010Hein et al, , 2017Sagredo et al, 2011;Murray et al, 2012;García et al, 2014García et al, , 2019Henríquez et al, 2015;Moreno et al, 2015Moreno et al, , 2018Bendle et al, 2017;Mendelova et al, 2017;Vilanova et al, 2019).…”

Section: Patagoniamentioning

confidence: 99%

The deglaciation of the Americas during the Last Glacial Termination

Palacios

Stokes

Phillips

et al. 2020

Earth-Science Reviews

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liosD hvid nd tokesD ghris F nd hillipsD pred wF nd glgueD tohn tF nd ell¡ EeygosD tesus nd endresD xuri nd engelD ssndr nd flrdD ierreErenri nd frinerD tson F nd rllD frend vF nd hhmsD hennis nd reinD endrew F nd tomelliD inent nd wrkD fryn qF nd wrtiniD wteo eF nd worenoD triio nd iedelD ton nd gredoD isten nd tnsellD xthn hF nd zquezEelemD vorenzo nd uilleD wthis nd rdD hyln tF @PHPHA 9he deglition of the emeris during the vst qlil ermintionF9D irthEsiene reviewsFD PHQ F pF IHQIIQF

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“…A large number of cores over many years have been retrieved from bogs (Heusser and Heusser, ; Heusser et al , ) and shallow lakes throughout north‐western Patagonia to elucidate vegetation–climate change, fire regime shifts and volcanic disturbance (i.e. Moreno and León, ; Pesce and Moreno, ; Henríquez et al , ). A key priority for these ongoing investigations has been to disentangle the role of paleofires and explosive volcanism from climate drivers of past vegetation change.…”

Section: Stratigraphymentioning

confidence: 99%

Stratigraphy, age and correlation of Lepué Tephra: a widespread c. 11 000 cal a BP marker horizon sourced from the Chaitén Sector of southern Chile

Alloway

Moreno

Pearce

et al. 2017

J Quaternary Science

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We describe the stratigraphy, age and correlation of a prominent tephra marker, named Lepué Tephra, extensively distributed in north‐western Patagonia. Lepué Tephra is well dated at c. 11 000 cal a BP from numerous lake and soil cover‐bed sequences and its recognition is useful for assessing the rate and timing of deglaciation as well as associated environmental changes in this region during the last glacial termination and early Holocene. Lepué Tephra has attributes typical of a complex and compositionally zoned phreatomagmatic eruptive. While the initial rhyolitic phase can be readily distinguished from multiple eruptive products sourced from the adjacent Volcán Chaitén, the main erupted end member is of basaltic–andesitic bulk composition − similar to younger tephras sourced from Holocene monogenetic cones adjacent to the Volcán Michimahuida massif (tMim). Lepué Tephra can be correlated to an equivalent‐aged pyroclastic flow deposit (Amarillo Ignimbrite) prominently distributed in the south‐eastern sector of tMim. The source vent for these co‐eruptive events is obscured by an extensive ice field and is currently unknown. The widespread radially symmetrical distribution of Lepué Tephra centred on tMim cannot be attributed solely to volcanological considerations. Reduced Southern Hemisphere westerly wind influence interpreted from climate proxies at the time of eruption are also implicated. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

Vegetation and climate change, fire-regime shifts and volcanic disturbance in Chiloé Continental (43°S) during the last 10,000 years

Cited by 28 publications

References 35 publications

Centennial and millennial‐scale dynamics inAraucaria–Nothofagusforests in the southern Andes

Centennial and millennial‐scale dynamics inAraucaria–Nothofagusforests in the southern Andes

The deglaciation of the Americas during the Last Glacial Termination

Stratigraphy, age and correlation of Lepué Tephra: a widespread c. 11 000 cal a BP marker horizon sourced from the Chaitén Sector of southern Chile

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