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Evolution of Resource Competition between Mutually Dependent Digital Organisms

Johnson, Tyler J. and Wilke, Claus O. (2004) Evolution of Resource Competition between Mutually Dependent Digital Organisms. Artificial Life, 10 (2). pp. 145-156. ISSN 1064-5462. doi:10.1162/106454604773563577.

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We study the emergence and dynamics of competing strains of digital organisms in a world with two depletable resources. Consumption of one resource produces the other resource as a by-product, and vice versa. As a consequence, two types of mutually dependent organisms emerge that each prey on the waste product of the other. In the absence of mutations, that is, in a purely ecological setting, the abundances of the two types of organisms display a wide range of different types of oscillations, from regular oscillations with large amplitude to irregular oscillations with amplitudes ranging from small to large. In this regime, time-averaged abundance levels seem to be controlled by the relative fitness of the organisms in the absence of resources. Under mutational pressure, on the other hand, populations evolve that seem to avoid the oscillations of intermediate to large amplitudes. In this case, the relative fitness of the organisms in the presence of resources plays an important role in the time-averaged abundance levels as well.

Item Type:Article
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Wilke, Claus O.0000-0002-7470-9261
Additional Information:© 2004 Massachusetts Institute of Technology. Posted Online March 11, 2006. We would like to thank Chris Adami, Tim Cooper, and Peter Dittrich for helpful suggestions and comments. C.O.W. was supported by NSF grant DEB-9981397 to Chris Adami. All data were obtained on a cluster of 160 processors at Michigan State University, supported by the NSF under the aforementioned contract.
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Subject Keywords:Digital organisms; resource competition; predator-prey interactions; evolutionary ecology.
Issue or Number:2
Record Number:CaltechAUTHORS:JOHal04
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13676
Deposited On:07 Jul 2009 17:27
Last Modified:08 Nov 2021 22:39

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