Alternative Biome States in Terrestrial Ecosystems

Area of Science:

• Ecology
• Biogeography
• Vegetation Science

Background:

• Growing interest in Alternative Stable State (ASS) theory for global vegetation patterns.
• Focus on nonforested (open) biomes in climates suitable for forests, termed alternative biome states (ABSs).
• Traditional views often attribute open ecosystems to deforestation or early successional stages.

Purpose of the Study:

• Introduce ASS theory to explain the persistence of ABSs.
• Provide an alternative framework to climate determinism and succession for understanding forest/nonforest mosaics.
• Explore the ancient origins and long-term stability of open ecosystems.

Main Methods:

• Review of diverse lines of evidence supporting the ancient nature of open ecosystems.
• Application of ASS theory to analyze landscape mosaics.
• Comparative analysis of tropical forest-savanna and other global landscape mosaics.

Main Results:

• Evidence suggests many open ecosystems are ancient and not solely products of recent deforestation.
• ASS theory provides a robust framework for understanding persistent open biomes.
• The framework successfully explains forest/nonforest mosaics beyond tropical savannas.

Conclusions:

• ASS theory offers a powerful lens for understanding complex vegetation patterns.
• Open ecosystems in suitable climates can represent ancient, stable states.
• The ABS framework enhances our understanding of global landscape dynamics.