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Coexistence in metacommunities: a tree-species model
Jaime Mena-Lorca1, Jorge X Velasco-Hernández, Pablo A Marquet
1Grupo de Ecología Matemática, Instituto de Matemática, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaiso, Chile. jmena@ucv.cl
Mathematical Biosciences
|June 27, 2006
Summary
Coexistence in dynamic landscapes is possible but harder to achieve than in static ones. A competition-colonization tradeoff and patch dynamics influence species survival in competitive metacommunities.
Area of Science:
- Ecology
- Theoretical Ecology
- Biodiversity Research
Background:
- Patch-occupancy models demonstrate coexistence via competition-colonization tradeoffs.
- Metacommunity dynamics are crucial for understanding species coexistence.
- Non-transitive competition hierarchies can influence community structure.
Purpose of the Study:
- To model interspecific competition in a dynamic metacommunity with a non-transitive hierarchy.
- To investigate how patch dynamics affect species coexistence.
- To identify conditions promoting or hindering coexistence based on species traits and landscape dynamics.
Main Methods:
- Developed a mathematical model of three-species competition in a landscape with dynamic patch creation and destruction.
- Analyzed species interactions based on a linear non-transitive hierarchy (Y3 > Y2 > Y1).
- Investigated parameter space to determine regions of coexistence and single-species dominance.
Main Results:
- Identified parameter regions where coexistence is possible and where single-species dominance occurs.
- Demonstrated that patch dynamics explicitly influence the conditions for species coexistence.
- Showed that coexistence is more challenging to attain in dynamic landscapes compared to static ones.
Conclusions:
- Species coexistence in dynamic metacommunities is contingent upon the interplay between species-specific traits and habitat patch dynamics.
- Patch dynamics act as a key modulator of the limiting similarity required for coexistence.
- Achieving stable coexistence requires careful consideration of landscape dynamism and interspecific competition strategies.
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