The Penna model for biological ageing on a lattice: spatial consequences of child-care |
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Authors: | AO Sousa S Moss de Oliveira |
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Institution: | (1) Instituto de Física, Universidade Federal Fluminense, Av. Litoranea s/n, Boa Viagem, Niterói 24210-340, RJ, Brazil, BR |
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Abstract: | We introduce a square lattice into the Penna bit-string model for biological ageing and study the evolution of the spatial
distribution of the population considering different strategies of child-care. Two of the strategies are related to the movements
of a whole family on the lattice: in one case the mother cannot move if she has any child younger than a given age, and in
the other case if she moves, she brings these young children with her. A stronger condition has also been added to the second
case, considering that young children die with a higher probability if their mothers die, this probability decreasing with
age. We show that a highly non uniform occupation can be obtained when child-care is considered, even for an uniform initial
occupation per site. We also compare the standard survival rate of the model with that obtained when the spacial lattice is
considered (without any kind of child-care).
Received 30 October 1998 and Received in final form 27 November 1998 |
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Keywords: | PACS 87 10 +e General theory and mathematical aspects - 07 05 Tp Computer modeling and simulation - 02 70 Lq Monte-Carlo and statistical methods |
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