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Related Experiment Video

Updated: May 14, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Local and regional processes in community assembly.

Juan C Márquez¹, Jurek Kolasa

¹Department of Biology, McMaster University, Hamilton, Ontario, Canada. juancmarquezh@gmail.com

|January 29, 2013

Summary

This summary is machine-generated.

Both deterministic and stochastic processes shape ecological communities. Experimental control revealed that while deterministic factors are important, regional influences and environmental heterogeneity are crucial for understanding natural community assembly.

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Area of Science:

Ecology
Community Ecology
Ecological Assembly

Background:

The long-standing debate on community structure hinges on whether local (deterministic) or regional (stochastic) factors are dominant.
Evidence from natural communities is confounded by assembly history, making it difficult to isolate causal factors.

Purpose of the Study:

To experimentally disentangle the roles of local deterministic and regional stochastic processes in community assembly.
To test hypotheses regarding community structure convergence/divergence under varying local to regional factor gradients.

Main Methods:

Creation of a "null community" by mixing 17 rock pool communities.
Experimental manipulation of treatments along a local-to-regional factor gradient using replicated null communities.
Analysis of community structure patterns in response to experimental treatments.

Main Results:

Results partially supported both deterministic and stochastic hypotheses, indicating a combined influence on community assembly.
A gradient of community configurations emerged, suggesting both deterministic and stochastic processes are at play.
Environmental heterogeneity and regional processes were identified as essential for explaining patterns in natural communities.

Conclusions:

Deterministic mechanisms play a significant role in community assembly.
In natural systems, the signal of deterministic factors can be masked by environmental heterogeneity and regional processes.
A combination of local, regional, and historical factors dictates community structure in metacommunities.