Madagascar's fire regimes challenge global assumptions about landscape degradation

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Version: author
License: CC BY 4.0
Serval ID
serval:BIB_EA62AFBD9245
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Madagascar's fire regimes challenge global assumptions about landscape degradation
Journal
Global Change Biology
Author(s)
Phelps Leanne N., Andela Niels, Gravey Mathieu, Davis Dylan S., Kull Christian A., Douglass Kristina, Lehmann Caroline E. R.
ISSN
1354-1013
1365-2486
Publication state
Published
Issued date
18/05/2022
Peer-reviewed
Oui
Language
english
Abstract
Narratives of landscape degradation are often linked to unsustainable fire use by local communities. Madagascar is a case in point: the island is considered globally exceptional, with its remarkable endemic biodiversity viewed as threatened by unsustainable anthropogenic fire. Yet, fire regimes on Madagascar have not been empirically characterised or globally contextualised. Here, we contribute a comparative approach to determining relationships between regional fire regimes and global patterns and trends, applied to Madagascar using MODIS remote sensing data (2003–2019). Rather than a global exception, we show that Madagascar's fire regimes are similar to 88% of tropical burned area with shared climate and vegetation characteristics, and can be considered a microcosm of most tropical fire regimes. From 2003–2019, landscape-scale fire declined across tropical grassy biomes (17%–44% excluding Madagascar), and on Madagascar at a relatively fast rate (36%–46%). Thus, high tree loss anomalies on the island (1.25–4.77× the tropical average) were not explained by any general expansion of landscape-scale fire in grassy biomes. Rather, tree loss anomalies centred in forests, and could not be explained by landscape-scale fire escaping from savannas into forests. Unexpectedly, the highest tree loss anomalies on Madagascar (4.77×) occurred in environments without landscape-scale fire, where the role of small-scale fires (<21 h [0.21 km2]) is unknown. While landscape-scale fire declined across tropical grassy biomes, trends in tropical forests reflected important differences among regions, indicating a need to better understand regional variation in the anthropogenic drivers of forest loss and fire risk. Our new understanding of Madagascar's fire regimes offers two lessons with global implications: first, landscape-scale fire is declining across tropical grassy biomes and does not explain high tree loss anomalies on Madagascar. Second, landscape-scale fire is not uniformly associated with tropical forest loss, indicating a need for socio-ecological context in framing new narratives of fire and ecosystem degradation.
Keywords
General Environmental Science, Ecology, Environmental Chemistry, Global and Planetary Change
Pubmed
Web of science
Open Access
Yes
Funding(s)
Swiss National Science Foundation / Careers / P2LAP2_187745
Swiss National Science Foundation / Careers / P500PN_206663
Create date
31/05/2022 16:07
Last modification date
03/06/2022 7:13
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