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Local facilitation, bistability and transitions in arid ecosystems
Sonia Kéfi1, Max Rietkerk, Minus van Baalen
1Department of Environmental Sciences, Utrecht University, Copernicus Institute, P.O. Box 80115, 3508 TC, Utrecht, The Netherlands. kefi@geo.uu.nl <kefi@geo.uu.nl>
Theoretical Population Biology
|November 14, 2006
Summary
A new model predicts arid ecosystem transitions. High local facilitation reduces abrupt desertification risk, but vegetation patchiness alone cannot distinguish between gradual or sudden shifts.
Area of Science:
- Ecology
- Environmental Science
- Mathematical Modeling
Background:
- Arid ecosystems face desertification due to climate change and human activities.
- A predictive framework for these ecosystem transitions is currently lacking.
- Understanding vegetation dynamics is crucial for arid land management.
Purpose of the Study:
- To develop a general model for vegetation spatial dynamics in arid environments.
- To investigate conditions leading to continuous versus discontinuous ecosystem transitions.
- To analyze the role of local facilitation in ecosystem stability.
Main Methods:
- Derivation and analysis of a general mathematical model.
- Inclusion of local facilitation as a key ecological process.
- Investigation of model parameters related to vegetation transitions.
Main Results:
- The model demonstrates bistability and vegetation patchiness.
- Increased local facilitation was found to decrease the risk of discontinuous transitions.
- Vegetation patchiness indicates proximity to a transition point in facilitated systems.
Conclusions:
- Local facilitation is a critical factor in mitigating abrupt desertification.
- While patchiness signals impending transitions, it doesn't differentiate between continuous and discontinuous shifts.
- The model provides a framework applicable to various stressed ecosystems.
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