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Community stability under different correlation structures of species' environmental responses
Lasse Ruokolainen1, Esa Ranta, Veijo Kaitala
1Integrative Ecology Unit, Department of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65, Viikinkaari 1, FI-00014, Finland. lasse.ruokolainen@helsinki.fi
Journal of Theoretical Biology
|August 19, 2009
Summary
Environmental variation impacts species interactions and community stability. Hierarchical responses to environmental changes are crucial for understanding ecological community dynamics in variable environments.
Area of Science:
- Ecology
- Environmental Science
- Theoretical Ecology
Background:
- Species interactions and community stability are influenced by environmental variability.
- Understanding how species respond to environmental changes is key to predicting community dynamics.
- Previous studies often assumed uniform species responses to environmental variation.
Purpose of the Study:
- To investigate the impact of different environmental response scenarios (independent, correlated, hierarchical) on community stability.
- To analyze the effects of environmental variation amplitude and autocorrelation on species evenness and diversity.
- To explore the differences in community stability between closed and open (migratory) ecological communities.
Main Methods:
- Simulated competitive ecological communities under various environmental forcing regimes.
- Modeled species responses to environmental variation as independent (IR), correlated (CR), or hierarchical (HR).
- Analyzed community stability metrics (evenness, species diversity) in relation to environmental variation amplitude and autocorrelation.
Main Results:
- Increased environmental variation amplitude and reddening reduced species evenness in closed communities across all response scenarios.
- Environmental autocorrelation had a minor effect on evenness in hierarchical response (HR) communities.
- Open communities exhibited distinct stability patterns based on species' environmental response correlations, with HR showing an intermediate evenness minimum under increasing environmental amplitude.
Conclusions:
- The structure of species' environmental responses significantly alters community stability under environmental variation.
- Hierarchical responses, reflecting niche differences, are critical for understanding community dynamics in variable environments.
- Ecological research must consider mechanistically derived, hierarchical environmental correlations, not just uniform ones, to accurately predict community stability.
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