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Species dynamics alter community diversity–biomass stability relationships

pmid: 22931046
Species dynamics alter community diversity–biomass stability relationships
AbstractThe relationship between community diversity and biomass variability remains a crucial ecological topic, with positive, negative and neutral diversity–stability relationships reported from empirical studies. Theory highlights the relative importance of Species–Species or Species–Environment interactions in driving diversity–stability patterns. Much previous work is based on an assumption of identical (stable) species‐level dynamics. We studied ecosystem models incorporating stable, cyclic and more complex species‐level dynamics, with either linear or non‐linear density dependence, within a locally stable community framework. Species composition varies with increasing diversity, interacting with the correlation of species' environmental responses to drive either positive or negative diversity–stability patterns, which theory based on communities with only stable species‐level dynamics fails to predict. Including different dynamics points to new mechanisms that drive the full range of diversity–biomass stability relationships in empirical systems where a wider range of dynamical behaviours are important.
- Spanish National Research Council Spain
- Swansea University United Kingdom
- University of Helsinki Finland
Population Dynamics, Biodiversity, Models, Biological, Animals, Biomass, Ecosystem
Population Dynamics, Biodiversity, Models, Biological, Animals, Biomass, Ecosystem
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