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Self-organization and vegetation collapse in salt marsh ecosystems
Johan van de Koppel1, Daphne van der Wal, Jan P Bakker
1Centre for Estuarine and Marine Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 140, 4400 AC Yerseke, The Netherlands. j.vsndekoppel@nioo.knaw.nl
The American Naturalist
|February 25, 2005
Summary
Salt marsh ecosystems exhibit self-organization driven by plant growth and clay accumulation. While beneficial short-term, this process creates critical states, making salt marshes vulnerable to destruction from disturbances like storms.
Area of Science:
- Ecology
- Complexity Theory
- Ecosystem Dynamics
Background:
- Ecosystems exhibit complex dynamics influenced by local feedback processes.
- The role of complexity in ecosystem resilience versus criticality is a key ecological question.
- Mineralogenic salt marshes present a unique system for studying self-organization.
Purpose of the Study:
- To investigate complex dynamics in salt marsh ecosystems.
- To analyze the positive feedback loop between clay accumulation and plant growth.
- To understand how self-organization impacts ecosystem stability and vulnerability.
Main Methods:
- Combined theoretical modeling and empirical study.
- Analysis of positive feedback mechanisms in salt marsh development.
- Assessment of ecosystem response to physical gradients and disturbances.
Main Results:
- Positive feedback between clay accumulation and plant growth drives self-organization.
- Self-organization buffers physical gradients, enhancing plant growth along the marine-terrestrial boundary.
- Ecosystems approach a critical state, increasing vulnerability to erosion and collapse.
Conclusions:
- Self-organization enhances salt marsh functioning on short timescales.
- Long-term self-organization leads to a critical state, increasing the risk of ecosystem destruction.
- Understanding these dynamics is crucial for salt marsh conservation and management.