Madagascar. These observations raise a question—if savannas in Madagascar are not anthro-pogenic, how then are they maintained in regions where the climate can support forest? Obser-vation reveals that the savanna–forest boundary coincides with a dispersal barrier—the escarpment of the Central Plateau.
A review of Madagascar's derived grasslands: Low palatability …
2023年8月11日 · Following Madagascar's drought-induced famine, our systematic review supports the theory that grasslands of the Malagasy Central Highland that are subjected to human-lit fires are anthropogenically derived.
Dispersal limitation and fire feedbacks maintain mesic savannas …
2020年9月2日 · This work challenges the view that highland savannas in Madagascar are derived by human-lit fires and, more importantly, suggests that partial dispersal barriers and strong nonlinear feedbacks can pin biogeographical boundaries over a wide range of environmental conditions, providing a temporary buffer against climate change.
Vegetation cover degradation assessment in Madagascar savanna …
2010年2月1日 · The objective is to quantify vegetation cover degradation in Madagascar savanna ecosystem by analysing NDVI time series of Terra-MODIS images for the period 2000–2007. The method consists in localizing savanna pixels that present no change or a significant decrease or increase in vegetation activity during the study period by analyzing the ...
Dispersal limitation and fire feedbacks maintain mesic ... - bioRxiv
2020年1月15日 · Using a stepping-stone model, we show that in a limited dispersal landscape, a stable savanna-forest boundary can form due to fire-vegetation feedbacks. This novel phenomenon, referred to as range pinning, could explain why eastern lowland forests have not expanded into the mesic savannas of the Central Highlands.
Dispersal limitation and fire feedbacks maintain mesic savannas in ...
2020年1月15日 · Using a stepping-stone model, we show that in a limited dispersal landscape, a stable savanna-forest boundary can form due to fire-vegetation feedbacks. This novel phenomenon, referred to as...
Across Madagascar, treeless grasslands characterised by erosion …
2024年7月16日 · Today, Madagascar is characterised by treeless grassland, loss of topsoil and increased river sediment that degrades estuaries and causes offshore delta fans, impacting not only aquatic biodiversity and commercial fisheries but also transportation for one of the island's largest ports, a phenomenon directly attributed to erosion from large ...
Dispersal limitation and fire feedbacks maintain mesic savannas in ...
Dispersal limitation and fire feedbacks maintain mesic savannas in Madagascar: Comment Ecology. 2023 Jun;104(6):e4045. doi: 10.1002/ecy.4045. Epub 2023 Apr 14. Authors Grant S Joseph 1 , Colleen L Seymour 1 2 Affiliations 1 Percy FitzPatrick ...
Status of deforestation of Madagascar - ScienceDirect
2023年4月1日 · In the past 20 years, 29% of Madagascar’s forests have disappeared. Researchers predict that 38–93% of the forest present in 2000 could disappear by 2050 (Vieilledent et al., 2020). The primary cause for deforestation in Madagascar is the slash-and-burn practice for pasture and agriculture.
110 savanna and forest are maintained in Madagascar. However, these models (Keitt et al. 2001, Wang 111 et al. 2019) consider a uniformly low dispersal landscape, whereas real landscapes have spatially 112 varying dispersal rates (see Rapoport 1982, Gaston 2003). As a result, the dynamics of tropical