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Adaptation games between microorganisms sharing a common substrate niche

Microorganisms adapt their enzymic outfit to the ambient substrate supply. If several species compete for a limiting substrate, then reciprocal influence on the state of adaptation results, which has been envisaged in the paper as strategic game. The most important types of strategies, which are assessed by the governing selection rule, are called aggressive, neutral and cooperative. A cooperative strategy brings the highest advantage, but triggers the temptation to increase the gain by defection. The neutral strategy, i.e. acting as if the competitor were alone in the medium, is promising only when the selection rule favours product maximization, whereas as aggressive strategy, e.g. maximizing the difference between own and foreign profit, is most effective on growth rate maximization as selection criterion. Gruelling competition reduces the metabolic output and weakens the community as a whole against other systems.