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• W3136898235 abstract "Savanna ecosystems are shaped by the frequency and intensity of regular fires. We model savannas via an ordinary differential equation (ODE) encoding a one-sided inhibitory Lotka-Volterra interaction between trees and grass. By applying fire as a discrete disturbance, we create an impulsive dynamical system that allows us to identify the impact of variation in fire frequency and intensity. The model exhibits three different bistability regimes: between savanna and grassland; two savanna states; and savanna and woodland. The impulsive model reveals rich bifurcation structures in response to changes in fire intensity and frequency -- structures that are largely invisible to analogous ODE models with continuous fire. In addition, by using the amount of grass as an example of a socially-valued function of the system state, we examine the resilience of the social value to different disturbance regimes. We find that large transitions (tipping) in the valued quantity can be triggered by small changes in disturbance regime." @default.
• W3136898235 created "2021-03-29" @default.
• W3136898235 creator A5051761299 @default.
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• W3136898235 date "2021-03-22" @default.
• W3136898235 modified "2023-09-23" @default.
• W3136898235 title "Impulsive fire disturbance in a savanna model: Tree-grass coexistence states, multiple stable system states, and resilience" @default.
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• W3136898235 hasPublicationYear "2021" @default.
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