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Simulation of reproductive risk and emergence of female reproductive cessation
Sousa, A.O. - In: Physica A: Statistical Mechanics and its Applications 326 (2003) 1, pp. 233-240
Using a simple computer model for evolution, we show that in a sexual population subject only to age …
Persistent link: https://www.econbiz.de/10010590901
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Population dynamics in heterogeneous conditions
Droz, Michel; Pe¸kalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 362 (2006) 2, pp. 504-512
Using a Monte Carlo approach we study a simple lattice model of populations living in a habitat where the external conditions are changing in space and in time. We show that above a certain value of the climatic gradient, the population gathers at a restricted part of the lattice. The average...
Persistent link: https://www.econbiz.de/10011060367
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Model of population migration in a changing habitat
Sznajd-Weron, Katarzyna; Pȩkalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 294 (2001) 3, pp. 424-430
We propose a model describing the colonization process of empty ecological niches. The members of the population are characterized by a single trait (phenotype). The fitness of an individual is measured as the difference between the value of its trait and the optimal phenotype characterizing the...
Persistent link: https://www.econbiz.de/10011060483
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Effects of random habitat destruction in a predator–prey model
Szwabiński, Janusz; Pe¸kalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 360 (2006) 1, pp. 59-70
The influence of habitat destruction on a population of predators and prey is studied. We show, via Monte Carlo simulations of a lattice model, that with growing devastation the oscillations in the densities of both species, as well as cross-correlations between the two densities diminish. As...
Persistent link: https://www.econbiz.de/10011061825
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Dynamics of a predator–prey model in a habitat with cover
Trojan, Kamil; Pȩkalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 330 (2003) 1, pp. 130-138
We extend the model introduced earlier (Phys. Rev. E 63 (2001) 051909) and show, via Monte Carlo simulations that the observed oscillations of the densities of predator and prey are correlated if the concentration of cover for prey is not too large. We demonstrate also that although at small...
Persistent link: https://www.econbiz.de/10011063617
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Evolution of populations in a changing environment
Sznajd-Weron, Katarzyna; Pȩkalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 269 (1999) 2, pp. 527-535
A model of a system of populations (metapopulation) is presented in which a population is characterized by a mean phenotype (or equivalently a continuous character) averaged over all individuals belonging to the population. The populations interact by exchanging genetic information (gene flow)...
Persistent link: https://www.econbiz.de/10011063805
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Evolution of population in changing conditions
Pȩkalski, Andrzej - In: Physica A: Statistical Mechanics and its Applications 314 (2002) 1, pp. 114-119
Evolution of a population subject to changing external conditions is studied. We show that the tendency to follow the …
Persistent link: https://www.econbiz.de/10011064156
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Global power shifts and the future of democracy: An evolutionary approach, with special attention to China
Owen, John M. - 2016
general questions concerning the regional and global waxing and waning of domestic regime types. Evolution's claims about the … co-evolution and niche construction are crucial: an agent may modify its environment such that one or more traits of that … agent enjoy a greater reproductive advantage. Agency, then, may be not an escape from evolution but a participation in co-evolution …
Persistent link: https://www.econbiz.de/10011596791
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Global power shifts and the future of democracy : an evolutionary approach, with special attention to China
Owen, John M. - 2016
general questions concerning the regional and global waxing and waning of domestic regime types. Evolution's claims about the … co-evolution and niche construction are crucial: an agent may modify its environment such that one or more traits of that … agent enjoy a greater reproductive advantage. Agency, then, may be not an escape from evolution but a participation in co-evolution …
Persistent link: https://www.econbiz.de/10011590640
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Complete closed-form solution to a stochastic growth model and corresponding speed of economic recovery
Feicht, Robert; Stummer, Wolfgang - 2010
We consider a continuous-time neoclassical one-sector stochastic growth model of Ramsey-type with CRRA utility and Cobb-Douglas technology, where each of the following components are exposed to exogeneous uncertainties (shocks): capital stock K, effectiveness of labor A, and labor force L; the...
Persistent link: https://www.econbiz.de/10010302618