Holocene Vegetation and Disturbance Dynamics in the Araucaria araucana Forest: a paleoecological contribution for conservation

Moreno‐González, Ricardo

doi:10.53846/goediss-8055

Cited by 3 publications

(9 citation statements)

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“…A full description of the vegetation history was published in Moreno‐Gonzalez ( 2020 ). It encompasses the last 9 kyr, and it is characterized by an overall vegetation transition that occurred ~4.5 ka from an open Nothofagus dombeyi ‐type woodland‐grassland vegetation that transitions to a more closed forest at 4.5 ka (Appendix 1 ), likely as a result of a change in precipitation regime rather than fire (Moreno‐Gonzalez et al, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…(Gonzalez et al, 2006 ) showing a strong fragmentation (Figure 1 ). Further details on climate and vegetation description, as well as a full description of the sediment analysis, pollen analysis, and the chronology can be found in Moreno‐Gonzalez ( 2020 ) and Moreno‐Gonzalez et al ( 2021 ). In brief, the sediment core was dated with 7 AMS Radiocarbon dates and then the chronology was made with smooth spline (0.1 spar) at 95% confidence.…”

Section: Methodsmentioning

confidence: 99%

“…For this study, I used pollen percentage and pollen accumulation rate (PAR) data from terrestrial taxa following standard method (Bennett & Willis, 2001 ). Calculation and methodology were further described in Moreno‐Gonzalez ( 2020 ). A stratigraphically constrained cluster analysis (CONISS) of the pollen samples (Grimm, 1987 ) was conducted based on Euclidean distances and calculated the amount of significant cluster zones by broken stick method (Bennett, 1996 ).…”

Section: Methodsmentioning

confidence: 99%

“…Moreno‐Gonzalez et al ( 2020 ): Pollen and macro‐charcoal analysis of Lake Relem sediment core, northern Patagonia. https://doi.org/10.1594/PANGAEA.923741 .…”

Section: Data Availability Statementmentioning

confidence: 99%

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Vegetation responses to past volcanic disturbances at the Araucaria araucana forest‐steppe ecotone in northern Patagonia

Moreno‐González

2022

Ecology and Evolution

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Volcanic eruptions play an important role in vegetation dynamics and its historical range of variability. However, large events are infrequent and eruptions with a significant imprint in today's vegetation occurred far in the past, limiting our understanding of ecological processes. Volcanoes in southern Andes have been active during the last 10 ka and support unique ecosystems such as the Araucaria – Nothofagus forest. Araucaria is an endangered species, with a fragmented distribution and well‐adapted to fire and volcanic disturbances. Yet, it was suggested that volcanism might have increased the fragmentation. Through the use of pollen and tephra analysis from a sedimentary record, this paleoecological study aims to provide an insight into the vegetation responses to past volcanic disturbances, to assess the role of volcanic disturbance on the vegetation dynamics and to determine if the current fragmentation has been caused by volcanism. Results show that during the last 9 kyr, 39 tephra falls buried the vegetation around Lake Relem, more frequently between 4 and 2 ka. The pollen percentage indicates that the vegetation changed after small tephra fall but seldom caused significant changes. However, the large eruption of Sollipulli volcano (~3 ka) changed the environmental conditions affecting severely the vegetation. Ephedra dominated the early successional stage, perhaps facilitating Nothofagus recovering after ~500 years. Slight increase of Araucaria and Nothofagus obliqua ‐type pollen percentages suggests that forest resisted without permanent changes and recovered relatively fast after the large eruption, perhaps because of sparse biological legacies distributed in the landscape. In the study area, the relative stability of Araucaria pollen after several tephra fall suggests no change in its past distribution at the current forest‐steppe ecotone, thus not affecting its current conservation status. Perhaps, random factors, the colonization patterns of the high elevations in the Andes after deglaciation and topography might play a more important role than previously thought.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Moreno‐Gonzalez et al ( 2020 ): Pollen and macro‐charcoal analysis of Lake Relem sediment core, northern Patagonia. https://doi.org/10.1594/PANGAEA.923741 .…”

Section: Data Availability Statementmentioning

confidence: 99%

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Vegetation responses to past volcanic disturbances at the Araucaria araucana forest‐steppe ecotone in northern Patagonia

Moreno‐González

2022

Ecology and Evolution

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“…Likewise, Jara and Moreno (2012) associate major increases in Eucryphia/ Caldcluvia trees with tephra fall (Lake Pichilafqu en, 41 S). In contrast, Jara et al (2019) document that changes in the Southern Westerlies (SW) were the dominant driver of vegetation change rather than disturbance (Lago Espejo, 43 S) Studies on the impact of ash deposition on vegetation have been conducted also east of the main mountain chain ( Alvarez-Barra et al, 2020;Moreno-Gonz alez, 2020), showing negligible impact of ash deposition on the vegetation composition.…”

Section: Introductionmentioning

confidence: 99%

Holocene changes in forest composition in northern Patagonia responded to climate with little impact of disturbance

Álvarez-Barra

Giesecke

Fontana

2022

Quaternary Science Reviews

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Fire and vegetation dynamics of endangered Araucaria araucana communities in the forest-steppe ecotone of northern Patagonia

Moreno‐González

Giesecke

Fontana

2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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Holocene Vegetation and Disturbance Dynamics in the Araucaria araucana Forest: a paleoecological contribution for conservation

Cited by 3 publications

References 0 publications

Vegetation responses to past volcanic disturbances at the Araucaria araucana forest‐steppe ecotone in northern Patagonia

Vegetation responses to past volcanic disturbances at the Araucaria araucana forest‐steppe ecotone in northern Patagonia

Holocene changes in forest composition in northern Patagonia responded to climate with little impact of disturbance

Fire and vegetation dynamics of endangered Araucaria araucana communities in the forest-steppe ecotone of northern Patagonia

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