Federico Cecconi and Domenico Parisi (1998)
Journal of Artificial Societies and Social Simulation vol. 1, no. 2, <http://jasss.soc.surrey.ac.uk/1/2/1.html>
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Received: 24-Oct-1997 Accepted: 12/2/98 Published: 31/3/98
Figure 1. A group of individuals adopting an individual survival strategy.
Figure 2. A group adopting a Central Store strategy. The individuals contribute (some of) the food they are able to capture in the environment to a Central Store and the food contained in the Central Store is redistributed to the entire group.
Figure 3. Evolutionary change in group size in ISS and CS groups across 20,000 cycles.
Figure 4. Evolutionary change in food capturing ability in ISS and CS groups. The food capturing ability of individuals belonging to the two groups is tested in identical 'laboratory' conditions
Figure 5. Change in group size in ISS and CS groups after a worsening of environmental conditions. The ISS groups all become extinct after 6,000 cycles (average of 25 runs of the simulation) while all the CS groups succeed in avoiding extinction and in reaching a new stable state corresponding to the carrying capacity of the new environment
Figure 6. Percentage of 'do nothing' actions in each cycle across 20,000 cycles of evolution for ISS and CS groups living in either favourable or unfavourable environments. All groups become extinct except the ISS groups living in the favourable environment, which succeed in keeping the percentage of 'do nothing' actions at very low levels.
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