The Amazon Basin which makes up 40% of South America has faced numerous threats for the past 40 years. However, the pressures facing the largest tropical wilderness have only grown in the past few years. This is problematic for many reasons, but most notably because it harbors some of the greatest biodiversity in the world, provides untold number of ecological services such as carbon sequestration, clean water and air, and is the home of over 1,000,000 indigenous people representing 400 tribes. Many of these people have never been contacted, and we know very little about their cultures and languages.
Earth’s richest reservoir of terrestrial biodiversity is increasingly threatened by escalating wildfire regimes driven by deforestation, climate change, and weakened policy enforcement. This review synthesizes peer-reviewed literature on wildfire impacts across taxa—including invertebrates, amphibians, insects, and forest ecosystems—and explores the cascading ecological effects on habitat structure, species persistence, and carbon dynamics. Recurrent wildfires erode forest resilience, undermine regeneration, and compromise conservation strategies. Strategic adaptation, informed by empirical fire‑ecology research, is essential to safeguard biodiversity in a rapidly changing Amazon.
Earth’s richest reservoir of terrestrial biodiversity is increasingly threatened by escalating wildfire regimes driven by deforestation, climate change, and weakened policy enforcement. This review synthesizes peer-reviewed literature on wildfire impacts across taxa—including invertebrates, amphibians, insects, and forest ecosystems—and explores the cascading ecological effects on habitat structure, species persistence, and carbon dynamics. Recurrent wildfires erode forest resilience, undermine regeneration, and compromise conservation strategies. Strategic adaptation, informed by empirical fire‑ecology research, is essential to safeguard biodiversity in a rapidly changing Amazon.
Locations of fires, marked in orange, which were detected by MODIS from August 15 to August 22, 2019. Image by Joshua Stevens at NASA Earth Observatory
Wildfires, historically rare in the Amazon rainforest, have surged dramatically in recent years due to a combination of human land-use change and accelerating climate stressors. Land clearing through slash-and-burn agriculture, deforestation for cattle ranching and soy production, and fragmentation from logging and road expansion all open the forest canopy and dry out previously fire-resistant systems, significantly enhancing flammability (Cochrane & Laurance 2002). Climate change exacerbates this by intensifying drought and raising temperatures, driven in part by El Niño cycles and warming Atlantic conditions (Nepstad et al. 2006; Flores et al. 2021). A 2023–2024 analysis found that climate change has made parts of the western Amazon 20–30× more prone to wildfire than they would be under a stable climate scenario.
Amazon deforestation and wildfires have been raging for decades, resulting in the the loss of 20% of this massive wilderness. However, the problem has only grown in recent years. This year has been particularly dire, with a surge in fires in Brazil, Bolivia, Paraguay, and Peru (see above). One of the largest contributing causes of these wildfires is due to slash-and-burn methods to clear land for agriculture and livestock. Natural wildfires do occur, but in this case over 99% of fires in the Amazon are caused by people. As the name implies, most rainforest will not naturally. Farmers wait for the dry season and they start burning and clearing the areas so that their cattle can graze. In August 2019 alone there were more than 80,000 fires in Brazil, 19,000 in Bolivia, 11,000 in Paraguay, and 6,700 in Peru. This has resulted in the loss of over 9000 km2 (3500m2) just this year.
The 80% increase in deforestation in Brazil has largely been due to clearing of land for cattle production (Kroger 2019). However, this process has also been fueled in other Amazon nations as a result of agrarian populism in which local and national politicians have undermined years of environmentalism focused on biodiversity and sustainable forest-based livelihoods. Brazilian deforestation is largely a product of demand for beef and soy exports, particularly to China and Hong Kong. Cattle production in Brazil has grown 56% in the past two decades. Unfortunately, much of the land that is being illegally seized is indigenous land which has been occupied for centuries. The situation is extraordinarily similar to the conquest of the Western United States in which murder of indigenous leaders precedes land grab for mining, ranching, and logging (Allen 2019).
Amazon deforestation and wildfires have been raging for decades, resulting in the the loss of 20% of this massive wilderness. However, the problem has only grown in recent years. This year has been particularly dire, with a surge in fires in Brazil, Bolivia, Paraguay, and Peru (see above). One of the largest contributing causes of these wildfires is due to slash-and-burn methods to clear land for agriculture and livestock. Natural wildfires do occur, but in this case over 99% of fires in the Amazon are caused by people. As the name implies, most rainforest will not naturally. Farmers wait for the dry season and they start burning and clearing the areas so that their cattle can graze. In August 2019 alone there were more than 80,000 fires in Brazil, 19,000 in Bolivia, 11,000 in Paraguay, and 6,700 in Peru. This has resulted in the loss of over 9000 km2 (3500m2) just this year.
The 80% increase in deforestation in Brazil has largely been due to clearing of land for cattle production (Kroger 2019). However, this process has also been fueled in other Amazon nations as a result of agrarian populism in which local and national politicians have undermined years of environmentalism focused on biodiversity and sustainable forest-based livelihoods. Brazilian deforestation is largely a product of demand for beef and soy exports, particularly to China and Hong Kong. Cattle production in Brazil has grown 56% in the past two decades. Unfortunately, much of the land that is being illegally seized is indigenous land which has been occupied for centuries. The situation is extraordinarily similar to the conquest of the Western United States in which murder of indigenous leaders precedes land grab for mining, ranching, and logging (Allen 2019).
The ecological and conservation implications of this intensifying wildfire regime are profound and multifaceted. Amazonian species evolved without fire tolerance, and even a single fire event can severely impact ground-dwelling amphibians, reptiles, and invertebrates, many of which are unable to escape advancing flames. Tree hollows and dense understory—crucial microhabitats—are frequently destroyed, threatening cavity-dependent primates and avifauna. Large mammals like jaguars and primates may survive the fire itself but suffer longer-term declines due to habitat loss and fragmentation of their territories.
Empirical studies underscore these dramatic shifts. In southeastern Amazonian forests, the community structure of fruit-feeding butterflies shifted starkly post-fire, with a decline in forest specialists and an increase in generalist species—driven largely by canopy openness (Andrade et al. 2017). Parallel patterns emerged in other taxa: dung beetle diversity and biomass declined significantly following fires, imperiling nutrient cycling and seed dispersal processes (de Andrade et al. 2014), while leaf-litter ant communities shifted toward disturbance-tolerant species (Silveira et al. 2013).
Forest regeneration is often severely impaired in floodplain systems, particularly where soils are nutrient-poor. Experimental fires revealed that seed recruitment is profoundly limited, leading to arrested succession and reduced recovery of canopy trees (Flores et al. 2021). When fires recur, the landscape may lock into an open, fire-prone equilibrium with low ecological value.
The scope of biodiversity affected is staggering. Range analyses of over 14,500 plant and vertebrate species revealed that wildfires since 2001 affected 95% of all Amazonian species and up to 85% of threatened species—impacting total ranges and placing many under heightened extinction risk (Silva Junior et al. 2021). Another estimate indicated 93–95% of 14,000 Amazonian species had been impacted by fires between 2001 and 2019, with primates among the most affected due to their dependence on arboreal habitats (Pires et al. 2021).
Protected areas and Indigenous territories—once effective fire refuges—are no longer impervious. In 2023, national data revealed a startling 846% increase in fire-affected area compared to the prior year (AP News, 2024). Although deforestation fell 22% that same year, fires surged 152%, especially in old-growth forests, driving degradation in regions previously considered secure (Global Change Biology, 2024).
The global consequences cannot be overstated. Amazon wildfires convert one of the world’s largest carbon sinks into a net carbon source, releasing massive CO₂ emissions that feed back into further warming and forest instability (Harvey 2020). This is especially alarming as even under optimistic climate scenarios, models project that 16% of the southern Brazilian Amazon could burn by 2050, catalyzing a biome shift toward savanna-like conditions.
Conservation Implications
To mitigate this crisis, a multi-tiered conservation response is essential:
Empirical studies underscore these dramatic shifts. In southeastern Amazonian forests, the community structure of fruit-feeding butterflies shifted starkly post-fire, with a decline in forest specialists and an increase in generalist species—driven largely by canopy openness (Andrade et al. 2017). Parallel patterns emerged in other taxa: dung beetle diversity and biomass declined significantly following fires, imperiling nutrient cycling and seed dispersal processes (de Andrade et al. 2014), while leaf-litter ant communities shifted toward disturbance-tolerant species (Silveira et al. 2013).
Forest regeneration is often severely impaired in floodplain systems, particularly where soils are nutrient-poor. Experimental fires revealed that seed recruitment is profoundly limited, leading to arrested succession and reduced recovery of canopy trees (Flores et al. 2021). When fires recur, the landscape may lock into an open, fire-prone equilibrium with low ecological value.
The scope of biodiversity affected is staggering. Range analyses of over 14,500 plant and vertebrate species revealed that wildfires since 2001 affected 95% of all Amazonian species and up to 85% of threatened species—impacting total ranges and placing many under heightened extinction risk (Silva Junior et al. 2021). Another estimate indicated 93–95% of 14,000 Amazonian species had been impacted by fires between 2001 and 2019, with primates among the most affected due to their dependence on arboreal habitats (Pires et al. 2021).
Protected areas and Indigenous territories—once effective fire refuges—are no longer impervious. In 2023, national data revealed a startling 846% increase in fire-affected area compared to the prior year (AP News, 2024). Although deforestation fell 22% that same year, fires surged 152%, especially in old-growth forests, driving degradation in regions previously considered secure (Global Change Biology, 2024).
The global consequences cannot be overstated. Amazon wildfires convert one of the world’s largest carbon sinks into a net carbon source, releasing massive CO₂ emissions that feed back into further warming and forest instability (Harvey 2020). This is especially alarming as even under optimistic climate scenarios, models project that 16% of the southern Brazilian Amazon could burn by 2050, catalyzing a biome shift toward savanna-like conditions.
Conservation Implications
To mitigate this crisis, a multi-tiered conservation response is essential:
- Enhanced Fire Management: Implementation of firebreaks, early detection systems, and controlled burns in buffer zones. Proactive firefighting infrastructure and coordination with Indigenous communities are vital.
- Ecological Restoration: In burned areas, replanting with native, fire-resilient species and restoring habitat structure are needed to facilitate recovery.
- Connectivity Maintenance: Conserving ecological corridors and enhancing habitat connectivity allows species movement and reduces isolation.
- Policy and Enforcement: Strengthened regulations against illegal fires and reforms favoring agroecological land practices must be enforced.
- Global Climate Action: Meeting Paris Agreement targets could significantly reduce future wildfire risk and protect Amazonian ecosystems (Earth Sys Sci Data, 2024)
In conclusion, Amazonian wildfires are no longer rare anomalies—they pose an existential threat to biodiversity, ecosystem function, and global climate stability. Scientific evidence from taxa to biome dynamics demands an urgent response integrating fire ecology, conservation biology, and climate policy. Achieving this will require global cooperation, regional enforcement, and deep engagement with Indigenous and traditional land stewards.
Literature Cited
- Allen, N. (2019). Brazil miners kill tribal leader in Amazon land invasion. The Telegraph. https://www.telegraph.co.uk/news/2019/05/03/brazil-miners-kill-tribal-leader-amazon-land-invasion/
Andrade, R. B., et al. (2017). Impacts of recurrent fires on diversity of fruit‑feeding butterflies in a southeastern Amazon forest. Journal of Tropical Ecology, 33(1), 22–32.
Butler, R. (2018). Calculating Deforestation Figures for the Amazon. Mongabay. https://news.mongabay.com/2018/02/calculating-deforestation-figures-for-the-amazon/
Cochrane, M. A., & Laurance, W. F. (2002). Fire as a large-scale edge effect in Amazonian forests. Journal of Tropical Ecology, 18(3), 311–325.
de Andrade, R. B., et al. (2014). Tropical forest fires and biodiversity: dung beetle community and biomass responses in a Brazilian Amazon forest. Journal of Insect Conservation, 18, 1097–1104.
Flores, B. M., Piedade, M. T. F., Nelson, B. W., & Wittmann, F. (2021). Why forests fail to recover after repeated wildfires in Amazonian floodplains? Journal of Ecology, 109(2), 836–849.
Harvey, C. (2020). Wildfires could transform Amazon from carbon sink to source. Scientific American. https://www.scientificamerican.com/article/wildfires-could-transform-amazon-from-carbon-sink-to-source/
Kröger, M. (2019). Deforestation, cattle capitalism and neodevelopmentalism in the Chico Mendes Extractive Reserve, Brazil. The Journal of Peasant Studies, 1-19. https://doi.org/10.1080/03066150.2019.1582618
Margulis, S. (2003). Causes of deforestation of the Brazilian Amazon. The World Bank. https://documents.worldbank.org/en/publication/documents-reports/documentdetail/515161468763874191/causes-of-deforestation-of-the-brazilian-amazon
Nepstad, D. et al. (2006). Inhibition of Amazon deforestation and fire by parks and indigenous lands. Conservation Biology, 20(1), 65–73.
Phillips, O. L., & Brienen, R. J. (2017). Carbon uptake by mature Amazon forests has mitigated Amazon nations’ carbon emissions. Carbon Balance and Management, 12(1), 1. https://doi.org/10.1186/s13021-017-0073-2
Pires, A. S., et al. (2021). Fires in the Amazon have already impacted more than 90% of animal and plant species in the biome. Mongabay. https://news.mongabay.com/2021/09/fires-in-the-amazon-have-already-impacted-more-than-90-of-animal-and-plant-species-in-the-biome/
Silva Junior, C. H. L., et al. (2021). The role of fire in deforestation in the Brazilian Amazon. Environmental Research Letters, 16(2), 025002. https://doi.org/10.1088/1748-9326/abc1f9
Silveira, J. M., et al. (2013). Responses of leaf-litter ant communities to wildfires in the Brazilian Amazon. Biodiversity & Conservation, 22, 513–529.
Wildfires in the Amazon: Consequences for Wildlife Conservation. Tropical Conservation Review, Tropical Conservation Fund.