Invasion and Interaction Determine Population Composition in an Open Evolving System
arXiv:2212.05187 · doi:10.1063/5.0142978
Abstract
It is well-known that interactions between species determine the population composition in an ecosystem. Conventional studies have focused on fixed population structures to reveal how interactions shape population compositions. However, interaction structures are not fixed, but change over time due to invasions. Thus, invasion and interaction play an important role in shaping communities. Despite its importance, however, the interplay between invasion and interaction has not been well explored. Here, we investigate how invasion affects the population composition with interactions in open evolving systems considering generalized Lotka-Volterra-type dynamics. Our results show that the system has two distinct regimes. One is characterized by low diversity with abrupt changes of dominant species in time, appearing when the interaction between species is strong and invasion slowly occurs. On the other hand, frequent invasions can induce higher diversity with slow changes in abundances despite strong interactions. It is because invasion happens before the system reaches its equilibrium, which drags the system from its equilibrium all the time. All species have similar abundances in this regime, which implies that fast invasion induces regime shift. Therefore, whether invasion or interaction dominates determines the population composition.
arXiv comment15 pages (including supplementary material), 8 figures (4 figures in main, 4 figures in SI)
References in corpus (10)
- Stability Criteria for Complex Ecosystems
- Large extinctions in an evolutionary model: The role of innovation and keystone species
- Coevolution Maintains Diversity in the Stochastic "Kill the Winner" Model
- Diversity, stability, and reproducibility in stochastically assembled microbial ecosystems
- Spatial interactions and oscillatory tragedies of the commons
- Ecosystems with mutually exclusive interactions self-organize to a state of high diversity
- Trade-off shapes diversity in eco-evolutionary dynamics
- Ecological communities from random generalised Lotka-Volterra dynamics with non-linear feedback
- Motif Dynamics in Signed Directional Complex Networks
- Enhanced robustness of evolving open systems by the bidirectionality of interactions between elements