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2004 | 14 | 2 | 139-147
Tytuł artykułu

Dynamic stability and spatial heterogeneityin the individualbased modelling of a lotkavolterra gas

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Computer simulation of a few thousands of particles moving (approximately) according to the energy and momentum conservation laws on a tessellation of squares in discrete time steps and interacting according to the predator-prey scheme is analyzed. The population dynamics are described by the basic Lotka-Volterra interactions (multiplication of preys, predation and multiplication of predators, death of predators), but the spatial effects result in differences between the system evolution and the mathematical description by the Lotka-Volterra equations. The spatial patterns were evaluated using entropy and a cross correlation coefficient for the spatial distribution of both populations. In some simulations the system oscillated with variable amplitude but rather stable period, but the particle distribution departed from the (quasi) homogeneous state and did not return to it. The distribution entropy oscillated in the same rhythm as the population, but its value was smaller than in the initial homogeneous state. The cross correlation coefficient oscillated between positive and negative values. Its average value depended on the space scale applied for its evaluation with the negative values on the small scale (separation of preys from predators) and the positive values on the large scale (aggregation of both populations). The stability of such oscillation patterns was based on a balance of the population parameters and particle mobility. The increased mobility (particle mixing) resulted in unstable oscillations with high amplitude, sustained homogeneity of the particle distribution, and final extinction of one or both populations.
Rocznik
Tom
14
Numer
2
Strony
139-147
Opis fizyczny
Daty
wydano
2004
otrzymano
2003-03-18
poprawiono
2003-11-10
(nieznana)
2004-03-06
Twórcy
  • Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, ul.Trojdena 4, 02-109 Warsaw, Poland
  • Faculty of Electronics, Telecommunications and Informatics, Technical University of Gdańsk, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland
  • Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, ul.Trojdena 4, 02-109 Warsaw, Poland
Bibliografia
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Typ dokumentu
Bibliografia
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