Food-chain competition influences gene's size

Details Food-chain competition influences gene's size Food-chain competition influences gene's size

2006-01-23

arxiv.org/abs/q-bio/0601039v1

Biology

Quantitative Biology

Populations and Evolution

11 pages including 7 figures

Scientific paper

10.1016/j.physa.2006.03.043

We have analysed an effect of the Bak-Sneppen predator-prey food-chain self-organization on nucleotide content of evolving species. In our model, genomes of the species under consideration have been represented by their nucleotide genomic fraction and we have applied two-parameter Kimura model of substitutions to include the changes of the fraction in time. The initial nucleotide fraction and substitution rates were decided with the help of random number generator. Deviation of the genomic nucleotide fraction from its equilibrium value was playing the role of the fitness parameter, $B$, in Bak-Sneppen model. Our finding is, that the higher is the value of the threshold fitness, during the evolution course, the more frequent are large fluctuations in number of species with strongly differentiated nucleotide content; and it is more often the case that the oldest species, which survive the food-chain competition, might have specific nucleotide fraction making possible generating long genes

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