1
IRUS Total
Downloads

Dry corridors opened by fire and low CO2 in Amazonian rainforest during last glacial maximum

File Description SizeFormat 
Sato et al. Dry corridors. 2021.pdfAccepted version2.84 MBAdobe PDFView/Open
Title: Dry corridors opened by fire and low CO2 in Amazonian rainforest during last glacial maximum
Authors: Sato, H
Kelly, D
Mayor, S
Calvo, MM
Cowling, S
Prentice, IC
Item Type: Journal Article
Abstract: The dynamics of Amazonian rainforest over long timescales connects closely to its rich biodiversity. While palaeoecological studies have suggested its stability through the Pleistocene, palaeontological evidence indicates the past existence of major expansions of savanna and grassland. Here we present integrated modeling evidence for a grassier Neotropics during the Last Glacial Maximum (LGM), congruent with palaeoecological and biological studies. Vegetation re-constructions were generated using the Land Processes and eXchanges (LPX) model, driven by model reconstructions of LGM climate, and compared against palynological data. A factorial experiment was performed to quantify the impacts of fire and low CO2 on vegetation and model-data agreement. Fire and low CO2 both individually and interactively induced widespread expansion of savanna and grassland biomes while improving model-data agreement. The interactive effects of fire and low CO2 induced the greatest ‘savannafication’ of the Neotropics, providing integrated evidence for a number of biogeographically relevant open vegetation formations including two dry corridors; paths of savanna and grassland through and around Amazonia that facilitated major dispersal and evolutionary diversification events. Our results show a bimodality in tree cover that was driven by fire and further enhanced by ‘CO2 deprivation’, which suggests biome instability in this region of climate space.
Issue Date: 1-Aug-2021
Date of Acceptance: 18-May-2021
URI: http://hdl.handle.net/10044/1/89956
DOI: 10.1038/s41561-021-00777-2
ISSN: 1752-0894
Publisher: Nature Research
Start Page: 578
End Page: 585
Journal / Book Title: Nature Geoscience
Volume: 14
Copyright Statement: © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
Sponsor/Funder: AXA Research Fund
Commission of the European Communities
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
787203
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
PMIP2 COUPLED SIMULATIONS
TERRESTRIAL CARBON-CYCLE
LATE QUATERNARY
GLOBAL VEGETATION
CLIMATE DYNAMICS
MULTIVARIATE-ANALYSIS
ENVIRONMENTAL-CHANGES
SOUTHEASTERN BRAZIL
EASTERN-CORDILLERA
LOWLAND AMAZONIA
Meteorology & Atmospheric Sciences
Publication Status: Published
Online Publication Date: 2021-07-29
Appears in Collections:Grantham Institute for Climate Change
Faculty of Natural Sciences