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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. http://resolver.caltech.edu/CaltechAUTHORS:JOHal04

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Abstract

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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1162/106454604773563577DOIUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
National Science FoundationDEB-9981397
Subject Keywords:Digital organisms; resource competition; predator-prey interactions; evolutionary ecology.
Record Number:CaltechAUTHORS:JOHal04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:JOHal04
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13676
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:07 Jul 2009 17:27
Last Modified:26 Dec 2012 10:53

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