Exploring the Stability of Predator-Prey Ecosystem in Response to Initial Population Density
초기 개체군 밀도가 포식자-피식자 생태계 안정성에 미치는 영향

Jung-Hee Cho, Sang-Hee Lee
2013 Journal of the Korea Society for Simulation  
The ecosystem is the complex system consisting of various biotic and abiotic factors and the factors interact with each other in the hierarchical predator-prey relationship. Since the competitive relation spatiotemporally occurs, the initial state of population density and species distribution are likely to play an important role in the stability of the ecosystem. In the present study, we constructed a lattice model to simulate the three-trophic ecosystem (predatorprey-plant) and using the
more » ... and using the model, explored how the ecosystem stability is affected by the initial density. The size of lattice space was L×L, (L=100) with periodic boundary condition. The initial density of the plant was arbitrarily set as the value of 0.2. The simulation result showed that predator and prey coexist when the density of predator is less than or equal to 0.4 and the density of prey is less than or equal to 0.5. On the other hand, when the predator density is more than or equal to 0.5 and the density of prey is more than or equal to 0.6, both of predator and prey were extinct. In addition, we found that the strong nonlinearity in the interaction between species was observed in the border area between the coexistence and extinction in the species density space.
doi:10.9709/jkss.2013.22.3.001 fatcat:um44dw2h5rbdrivtunjyy32fqe