Scale-dependence of resource-biodiversity relationships

Area of Science:

• Ecology
• Spatial Ecology
• Theoretical Ecology

Background:

• The relationship between resource availability and species richness is a fundamental ecological question.
• Understanding how this relationship varies across different spatial scales is crucial for ecological theory and conservation.

Purpose of the Study:

• To investigate the functional relationship between resource availability and species richness at both community (small) and regional (large) spatial scales.
• To elucidate the theoretical underpinnings of scale-dependent species-richness patterns.
• To explore the role of resource patch dynamics and species pool characteristics.

Main Methods:

• Utilized a multi-species contact process on a heterogeneous landscape, a stochastic spatial model.
• Applied percolation theory and the theory of competitive exclusion processes.
• Conducted Monte Carlo simulations at both small and regional scales.

Main Results:

• Demonstrated that a unimodal resource-species relationship at small scales arises from a tradeoff between resource patch availability and connectivity.
• Showed that regional-scale relationships transition to a monotonically increasing pattern.
• Identified the presence of a resource-dependent species pool as critical for this scale transition.

Conclusions:

• The observed scale-dependent patterns in species richness are explained by the interplay of local resource dynamics and regional species pool structure.
• Theoretical predictions of the scale transition were confirmed through simulations.
• Spatial correlations in resource and species distribution may influence these patterns.