| Affiliation: | (1) Departamento de Física, Universidade Federal de Ouro Preto, Campus do Morro do Cruzeiro, 35.400-000, Ouro Preto/MG, Brazil, BR;(2) Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Caixa Postal 702, 30.123-970, Belo Horizonte/MG, Brazil, BR |
| Abstract: | In the time evolution of populations, many attractors can be found: fixed points, limit cycles and chaotic regimes. Usually, chaotic behaviour is observed in species which have well defined breeding seasons and a high fertility rate. Different mathematical models have been used in order to simulate those regimes. In this paper, we use the bitstring model introduced to simulate the evolution of age-structured populations -- the Penna Model -- to simulate a sort of cyclic and chaotic behaviours. In comparison with the standard logistic map, our results show a time changing parameter. Received: 5 August 1997 / Revised: 8 November 1997 / Accepted: 13 November 1997 |
