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Stage structure alters how complexity affects stability of ecological networks
V H W Rudolf1, Kevin D Lafferty
1Department of Ecology and Evolutionary Biology, Rice University, Houston, TX, USA. volker.rudolf@rice.edu
Ecology Letters
|December 1, 2010
Summary
Natural communities are more vulnerable to biodiversity loss than previously thought. Ontogenetic niche shifts, where species change diets during development, destabilize ecosystems and increase extinction risk, especially in complex food webs.
Area of Science:
- Ecology
- Biodiversity Science
- Theoretical Ecology
Background:
- Ecological stability is crucial for predicting biodiversity loss impacts.
- Previous models assumed consumer resource substitutability.
- Most species exhibit ontogenetic niche shifts, changing diets across life stages.
Purpose of the Study:
- To investigate the impact of ontogenetic niche shifts on ecological network stability.
- To determine how these shifts affect species extinction risk.
- To re-evaluate the relationship between ecological complexity and stability.
Main Methods:
- Analysis of real-world ecological networks to identify ontogenetic niche shifts.
- Modeling of food web dynamics incorporating ontogenetic niche shifts.
- Comparison of stability predictions with and without considering diet changes.
Main Results:
- Ontogenetic niche shifts are common in ecological networks.
- Considering niche shifts alters predictions of species extinction risk.
- Niche shifts reduce or reverse the stabilizing effect of ecological complexity.
Conclusions:
- Species with ontogenetic niche shifts act as sequential specialists, increasing vulnerability.
- Ecological networks may be more sensitive to biodiversity loss than previously estimated.
- Understanding ontogenetic niche shifts is vital for accurate biodiversity loss impact assessments.
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