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Intransitive Stability Collapses Under the Influence of Dominant Competitors
The American Naturalist
|June 10, 2024
Summary
Intransitive competition loops may not significantly boost species coexistence in diverse communities. Dominant competitors can negate the stabilizing effects of these loops, highlighting the importance of the entire interaction network.
Area of Science:
- Ecology
- Theoretical Ecology
- Community Ecology
Background:
- Intransitive competition, characterized by cyclic species interactions, is theorized to promote species coexistence.
- The role of these interactions in complex, real-world communities with mixed hierarchies is not well understood.
Purpose of the Study:
- To investigate the impact of intransitive competition loops within larger ecological networks.
- To determine if the stabilizing effects of intransitivity persist when interacting with dominant competitors.
Main Methods:
- Ecological network simulations were employed.
- The behavior of intransitive loops interacting with external competitors was modeled.
Main Results:
- Dominant competitors were found to frequently counteract the positive effects of intransitive loops involving inferior competitors.
- The stabilizing influence of intransitive loops can be diminished or eliminated by the broader network structure.
Conclusions:
- The beneficial effects of intransitivity on species coexistence may be overestimated.
- Ecological network properties, like stabilization by intransitive loops, must be interpreted within the context of the global network structure.
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