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Invasion and interaction determine population composition in an open evolving ecological system

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Title
Invasion and interaction determine population composition in an open evolving ecological system
Author(s)
Youngjai Park; Shimada, Takashi; Son, Seung-Woo; Park, Hye Jin
Publication Date
2023-06
Journal
Chaos, v.33, no.6
Publisher
American Institute of Physics
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 ecological 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. © 2023 Author(s). Published under an exclusive license by AIP Publishing.
URI
https://pr.ibs.re.kr/handle/8788114/13622
DOI
10.1063/5.0142978
ISSN
1054-1500
Appears in Collections:
Center for Neuroscience Imaging Research (뇌과학 이미징 연구단) > 1. Journal Papers (저널논문)
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