Impact of a Drier Climate on Amazonian Forests
Author Information
Author(s): Francis E. Mayle, Mitchell J. Power
Primary Institution: School of GeoSciences, University of Edinburgh
Hypothesis
How did the drier climatic conditions of the Early–Mid-Holocene affect Amazonian forests and their fire regimes?
Conclusion
The Amazon forest biome has shown remarkable resilience to significantly drier climatic conditions, with only ecotonal areas experiencing biome replacement.
Supporting Evidence
- During the Early–Mid-Holocene, Andean cloud forest taxa were replaced by lowland tree taxa as the cloud base rose.
- Lowland ecotonal areas were dominated by savannahs and/or semi-deciduous dry forests instead of evergreen rainforest.
- Evidence of forest burning was widespread, but the forest biome remained resilient in most parts of Amazonia.
Takeaway
A long time ago, when it was drier in the Amazon, the forests changed a lot, but they were still able to survive even though some areas turned into savannahs.
Methodology
The study synthesized palaeovegetation and palaeofire records from 20 sites across the Amazon Basin to analyze the impact of past climatic conditions.
Potential Biases
Potential anthropogenic influences on fire activity complicate the interpretation of natural versus human-induced changes.
Limitations
The absence of Holocene palaeotemperature records from lowland Amazonia limits the applicability of findings to future climate scenarios.
Digital Object Identifier (DOI)
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