Click here for a link to Nature journal.
Click here for an abstract of this article
Click here to download the Avida source code (version 1.3) used in these experiments. All experiments were performed under Redhat Linux (version 5.0), on the Beowulf cluster in the Center for Advanced Computing Research at the California Institue of Technology.
Click here to go to the main Avida pages for the latest version of the software.
Click here to obtain the files (both configuration and executables) that were used to perform the experiments in the complex environment, and here for the corresponding files for experiments in the simple environment.
Click here for a directory of files containing the 87 complex organisms (creature.final.base.101, etc.) and the 87 paired simple organisms (creature.final.devolve.101, etc.)
Click here for an Excel worksheet that contains the data obtained from these organisms and used in the paper. Click here for the same data in an HTML table.
Correspondence should be addressed to R.E. Lenski (e-mail: lenski@pilot.msu.edu); requests for further materials to C. Ofria (e-mail: charles@krl.caltech.edu.)