The biology of digital organisms

The Hypercycle: A principle of natural self-organization

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Cooperation and Competition in the Evolution of ATP-Producing Pathways

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Deleterious mutations and the evolution of sexual reproduction

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Automatic design and manufacture of robotic lifeforms

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The fate of competing beneficial mutations in an asexual population

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Evolution of high mutation rates in experimental populations of E. coli

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The fate of competing beneficial mutations in an asexual population

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Artificial Life II

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Evolution of digital organisms at high mutation rates leads to survival of the flattest

Wilke, C. O., Wang, J. L., Ofria, C., Lenski, R. E., & Adami, C. (2001) · Nature · doi:10.1038/35085569 · Cited by 623

The evolutionary origin of complex features

Lenski, R. E., Ofria, C., Pennock, R. T., & Adami, C. (2003) · Nature · doi:10.1038/nature01568 · Cited by 754

Robustness can evolve gradually in complex regulatory gene networks with varying topology

Ciliberti, S., Martin, O. C., & Wagner, A. (2007) · PLoS Computational Biology · doi:10.1371/journal.pcbi.0030015 · Cited by 390

What is complexity?

Adami, C. (2002) · BioEssays · doi:10.1002/bies.10192 · Cited by 397

The population genetics and evolutionary epidemiology of RNA viruses

Moyá, A., Holmes, E. C., & Gónzález‐Candelas, F. (2004) · Nature Reviews Microbiology · doi:10.1038/nrmicro863 · Cited by 402

Avida: A Software Platform for Research in Computational Evolutionary Biology

Ofria, C., & Wilke, C. O. (2004) · Artificial Life · doi:10.1162/106454604773563612 · Cited by 378

Simulation as experiment: a philosophical reassessment for biological modeling

Peck, S. L. (2004) · Trends in Ecology & Evolution · doi:10.1016/j.tree.2004.07.019 · Cited by 300

Fundamentals of natural computing: an overview

DECASTRO, L. (2006) · Physics of Life Reviews · doi:10.1016/j.plrev.2006.10.002 · Cited by 299

Life is Physics: Evolution as a Collective Phenomenon Far From Equilibrium

Goldenfeld, N. D., & Woese, C. R. (2011) · Annual Review of Condensed Matter Physics · doi:10.1146/annurev-conmatphys-062910-140509 · Cited by 282

A Life‐History Perspective on Short‐ and Long‐Term Consequences of Compensatory Growth

Mangel, M., & Munch, S. B. (2005) · The American Naturalist · doi:10.1086/444439 · Cited by 250

Towards an evolutionary ecology of life in soil

Crawford, J. W., HARRIS, J., Ritz, K., & Young, I. M. (2004) · Trends in Ecology & Evolution · doi:10.1016/j.tree.2004.11.014 · Cited by 164

Digital genetics: unravelling the genetic basis of evolution

Adami, C. (2006) · Nature Reviews Genetics · doi:10.1038/nrg1771 · Cited by 136

Evolution of mutational robustness

Wilke, C. O., & Adami, C. (2003) · Mutation research. Fundamental and molecular mechanisms of mutagenesis · doi:10.1016/s0027-5107(02)00307-x · Cited by 136

Adaptive Radiation from Resource Competition in Digital Organisms

Chow, S. S., Wilke, C. O., Ofria, C., Lenski, R. E., & Adami, C. (2004) · Science · doi:10.1126/science.1096307 · Cited by 133

Sexual reproduction reshapes the genetic architecture of digital organisms

Misevic, D., Ofria, C., & Lenski, R. E. (2005) · Proceedings of the Royal Society B Biological Sciences · doi:10.1098/rspb.2005.3338 · Cited by 124

EFFECTS OF POPULATION SIZE AND MUTATION RATE ON THE EVOLUTION OF MUTATIONAL ROBUSTNESS

Elena, S. F., Wilke, C. O., Ofria, C., & Lenski, R. E. (2007) · Evolution · doi:10.1111/j.1558-5646.2007.00064.x · Cited by 73

Selective pressures on genomes in molecular evolution

Ofria, C., Adami, C., & Collier, T. C. (2003) · Journal of Theoretical Biology · doi:10.1016/s0022-5193(03)00062-6 · Cited by 60

E1 Ecological Specialization and Adaptive Decay in Digital Organisms

Ostrowski, E. A., Ofria, C., & Lenski, R. E. (2006) · The American Naturalist · doi:10.1086/510211 · Cited by 51

Adaptive Phenotypic Plasticity Stabilizes Evolution in Fluctuating Environments

Lalejini, A., Ferguson, A. J., Grant, N. A., & Ofria, C. (2021) · Frontiers in Ecology and Evolution · doi:10.3389/fevo.2021.715381 · Cited by 49

Using Avida-ED for Teaching and Learning About Evolution in Undergraduate Introductory Biology Courses

Speth, E. B., Long, T. M., Pennock, R. T., & Ebert‐May, D. (2009) · Evolution Education and Outreach · doi:10.1007/s12052-009-0154-z · Cited by 49

Monomer Abundance Distribution Patterns as a Universal Biosignature: Examples from Terrestrial and Digital Life

Dorn, E. D., Nealson, K. H., & Adami, C. (2011) · Journal of Molecular Evolution · doi:10.1007/s00239-011-9429-4 · Cited by 52

Grand Views of Evolution

de Vladar, H. P., Mauro Santos, A., & Szathmáry, E. (2017) · Trends in Ecology & Evolution · doi:10.1016/j.tree.2017.01.008 · Cited by 42

Modeling post-depositional mixing of archaeological deposits

Brantingham, P. J., Surovell, T. A., & Waguespack, N. M. (2007) · Journal of Anthropological Archaeology · doi:10.1016/j.jaa.2007.08.003 · Cited by 40

Sequence complexity in Darwinian evolution

Adami, C. (2002) · Complexity · doi:10.1002/cplx.10071 · Cited by 40

Adaptation in Simple and Complex Fitness Landscapes

Jain, K., & Krug, J. (2007) · Biological and medical physics series · doi:10.1007/978-3-540-35306-5_14 · Cited by 35

Fundamental constraints to the logic of living systems

Solé, R., Kempes, C. P., Corominas-Murtra, B., De Domenico, M., Kolchinsky, A., Lachmann, M., Libby, E., Saavedra, S., Smith, E., & Wolpert, D. (2024) · Interface Focus · doi:10.1098/rsfs.2024.0010 · Cited by 34

Information-Theoretic Considerations Concerning the Origin of Life

Adami, C. (2015) · Origins of Life and Evolution of Biospheres · doi:10.1007/s11084-015-9439-0 · Cited by 31

Digital natures: New ontologies, new politics?

Luque‐Ayala, A., Machen, R., & Nost, E. (2024) · Digital Geography and Society · doi:10.1016/j.diggeo.2024.100081 · Cited by 28

Avida

Ofria, C., Bryson, D., & Wilke, C. O. (2009) · Springer eBooks · doi:10.1007/978-1-84882-285-6_1 · Cited by 31

Historical and contingent factors affect re‐evolution of a complex feature lost during mass extinction in communities of digital organisms

Yedid, G., Ofria, C., & Lenski, R. E. (2008) · Journal of Evolutionary Biology · doi:10.1111/j.1420-9101.2008.01564.x · Cited by 28

Validating viral quasispecies with digital organisms: a re-examination of the critical mutation rate

Comas, I., Moyá, A., & Gónzález‐Candelas, F. (2005) · BMC Evolutionary Biology · doi:10.1186/1471-2148-5-5 · Cited by 25

Evolution of Resource Competition between Mutually Dependent Digital Organisms

Johnson, T. J., & Wilke, C. O. (2004) · Artificial Life · doi:10.1162/106454604773563577 · Cited by 24

Different Evolutionary Paths to Complexity for Small and Large Populations of Digital Organisms

LaBar, T., & Adami, C. (2016) · PLoS Computational Biology · doi:10.1371/journal.pcbi.1005066 · Cited by 24

Agent Based Modeling and Artificial Life

Macal, C. M. (2009) · Springer eBooks · doi:10.1007/978-0-387-30440-3_7 · Cited by 25

Experiments with Digital Organisms on the Origin and Maintenance of Sex in Changing Environments

Misevic, D., Ofria, C., & Lenski, R. E. (2010) · Journal of Heredity · doi:10.1093/jhered/esq017 · Cited by 23

Artificial selection methods from evolutionary computing show promise for directed evolution of microbes

Lalejini, A., Dolson, E. L., Vostinar, A. E., & Zaman, L. (2022) · eLife · doi:10.7554/elife.79665 · Cited by 22

Escaping the Accidents of History: An Overview of Artificial Life Modeling with Repast

NORTH, M. J., & Macal, C. M. (2006) · Springer eBooks · doi:10.1007/1-84628-214-4_6 · Cited by 21

Cascade of Complexity in Evolving Predator-Prey Dynamics

Guttenberg, N., & Goldenfeld, N. D. (2008) · Physical Review Letters · doi:10.1103/physrevlett.100.058102 · Cited by 20

The Roles of Standing Genetic Variation and Evolutionary History in Determining the Evolvability of Anti-Predator Strategies

O’Donnell, D. R., Fish, J. A., Parigi, A. A., Dworkin, I. M., & Wagner, A. P. (2014) · PLoS ONE · doi:10.1371/journal.pone.0100163 · Cited by 20

Prospects of a Computational Origin of Life Endeavor

Shenhav, B., & Lancet, D. (2003) · Origins of Life and Evolution of Biospheres · doi:10.1023/b:orig.0000009839.53483.42 · Cited by 17

Self-Protection and Diversity in Self-Replicating Cellular Automata

Sayama, H. (2004) · Artificial Life · doi:10.1162/106454604322875922 · Cited by 18

PRODUCTIVITY AND DIVERSITY IN A CROSS-FEEDING POPULATION OF ARTIFICIAL ORGANISMS

Gerlee, P., & Lundh, T. (2010) · Evolution · doi:10.1111/j.1558-5646.2010.01020.x · Cited by 17

Quasispecies in Time-Dependent Environments

Wilke, C. O., Forster, R., & Novella, I. S. (2006) · Springer eBooks · doi:10.1007/3-540-26397-7_2 · Cited by 17

Digital Evolution

O’Neill, B. (2003) · PLoS Biology · doi:10.1371/journal.pbio.0000018 · Cited by 16

Sexual reproduction and Muller's ratchet in digital organisms

Misevic, D., Lenski, R. E., & Ofria, C. (2004) · The MIT Press eBooks · doi:10.7551/mitpress/1429.003.0057 · Cited by 16

Experiments in Digital Evolution (Editors' Introduction to the Special Issue)

Adami, C., & Wilke, C. O. (2004) · Artificial Life · doi:10.1162/106454604773563540 · Cited by 16

Non-adaptive origins of evolutionary innovations increase network complexity in interacting digital organisms

Fortuna, M. A., Zaman, L., Wagner, A., & Bascompte, J. (2017) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.2016.0431 · Cited by 15

The effects of low-impact mutations in digital organisms

Nelson, C. W., & Sanford, J. C. (2011) · Theoretical Biology and Medical Modelling · doi:10.1186/1742-4682-8-9 · Cited by 15

How to Build a Biological Machine Using Engineering Materials and Methods

Ellery, A. A. (2020) · Biomimetics · doi:10.3390/biomimetics5030035 · Cited by 15

Using Avida to Test the Effects of Natural Selection on Phylogenetic Reconstruction Methods

Hagstrom, G. I., Hang, D., Ofria, C., & Torng, E. K. (2004) · Artificial Life · doi:10.1162/106454604773563586 · Cited by 15

A new computational system, DOVE (Digital Organisms in a Virtual Ecosystem), to study phenotypic plasticity and its effects in food webs

Peacor, S. D., Stefano Allesina, A., Riolo, R., & Hunter, T. S. (2007) · Ecological Modelling · doi:10.1016/j.ecolmodel.2007.01.026 · Cited by 14

Maintenance of Species Diversity by Predation in the Tierra System

Shao, J., & Ray, T. S. (2010) · Cited by 13

In silicoevolution of functional morphology: a test on bone tissue biomechanics

de Margerie, E., Tafforeau, P., & Rakotomanana-Ravelonarivo, L. (2006) · Journal of The Royal Society Interface · doi:10.1098/rsif.2006.0128 · Cited by 14

Evolvability of the Genotype-Phenotype Relation in Populations of Self-Replicating Digital Organisms in a Tierra-Like System

Egri-Nagy, A., & Nehaniv, C. L. (2003) · Lecture notes in computer science · doi:10.1007/978-3-540-39432-7_26 · Cited by 14

Digital Evolution in Time-Dependent Fitness Landscapes

Li, Y., & Wilke, C. O. (2004) · Artificial Life · doi:10.1162/106454604773563559 · Cited by 13

Agent-Based Modeling and Artificial Life

Macal, C. M. (2015) · Springer eBooks · doi:10.1007/978-3-642-27737-5_7-5 · Cited by 15

Evolution in Lego ®: A Physical Simulation of Adaptation by Natural Selection

Christensen‐Dalsgaard, J., & Kanneworff, M. (2008) · Evolution Education and Outreach · doi:10.1007/s12052-008-0099-7 · Cited by 12

Agent-Based Modeling and Artificial Life

Macal, C. M. (2020) · Springer eBooks · doi:10.1007/978-1-0716-0368-0_7 · Cited by 11

Ecological and Mutation-Order Speciation in Digital Organisms

Anderson, C. J. R., & Harmon, L. J. (2013) · The American Naturalist · doi:10.1086/674359 · Cited by 11

Insights into resource consumption, cross-feeding, system collapse, stability and biodiversity from an artificial ecosystem

Liu, Y., & Sumpter, D. J. T. (2017) · Journal of The Royal Society Interface · doi:10.1098/rsif.2016.0816 · Cited by 11

Evolutionary Computation

Banzhaf, W., & Hu, T. (2019) · Oxford University Press eBooks · doi:10.1093/obo/9780199941728-0122 · Cited by 11

Towards Systems Resilience

Maruyama, H. (2013) · International Conference on Dependable Systems and Networks workshops · doi:10.1109/dsnw.2013.6615532 · Cited by 8

Symbiosis in Digital Evolution: Past, Present, and Future

Vostinar, A. E., Skocelas, K. G., Lalejini, A., & Zaman, L. (2021) · Frontiers in Ecology and Evolution · doi:10.3389/fevo.2021.739047 · Cited by 7

Bifurcation into Functional Niches in Adaptation

White, J. S., & Adami, C. (2004) · Artificial Life · doi:10.1162/106454604773563568 · Cited by 7

Tag-based regulation of modules in genetic programming improves context-dependent problem solving

Lalejini, A., Moreno, M. A., & Ofria, C. (2021) · Genetic Programming and Evolvable Machines · doi:10.1007/s10710-021-09406-8 · Cited by 9

The future of evolutionary biology

Lenski, R. E. (2004) · Cited by 7

Is information a selectable trait?Preprint

Mirmomeni, M., Punch, W., & Adami, C. (2014) · arXiv.org · doi:10.48550/arxiv.1408.3651 · Cited by 10

Self-organisation and emergence in artificial life: concepts and illustrations

Muñoz, Y. J., & de Castro, L. N. (2009) · Journal of Experimental & Theoretical Artificial Intelligence · doi:10.1080/09528130902823649 · Cited by 6

Scientifi c Fictions as Rules of Inference

Suárez, M. (2008) · Routledge eBooks · doi:10.4324/9780203890103-14 · Cited by 6

Towards Systems Resilience

Maruyama, H., & Minami, K. (2013) · Innovation and supply chain management · doi:10.14327/iscm.7.105 · Cited by 5

Does the Red Queen Reign in the Kingdom of Digital Organisms?

Wilke, C. O. (2003) · Lecture notes in computer science · doi:10.1007/978-3-540-39432-7_43 · Cited by 5

Avida: Evolution Experiments with Self-Replicating Computer Programs

Ofria, C., & Wilke, C. O. (2005) · Springer eBooks · doi:10.1007/1-84628-214-4_1 · Cited by 5

The Effect of Natural Selection on Phylogeny Reconstruction Algorithms

Hang, D., Ofria, C., Schmidt, T. M., & Torng, E. K. (2003) · Lecture notes in computer science · doi:10.1007/3-540-45105-6_2 · Cited by 5

PHYSICAL COMPLEXITY AND COGNITIVE EVOLUTION

Jedlička, P. (2007) · doi:10.1142/9789812707420_0014 · Cited by 6

The Scope of Evolutionary Thinking

Reydon, T. A. C. (2025) · Cambridge University Press eBooks · doi:10.1017/9781009181839 · Cited by 4

Evaluating resilience strategies based on an evolutionary multi-agent system

Minami, K., Tanjo, T., & Maruyama, H. (2013) · IEEE International Conference on Cybernetics and Computational Intelligence (CyberneticsCom) · doi:10.1109/cyberneticscom.2013.6865776 · Cited by 4

A Personal Narrative of 6 Pre-University Research Projects Over 7 Years (2009-2015) Yielding 19 Manuscripts

Ling, M. H. (2017) · MOJ Proteomics & Bioinformatics · doi:10.15406/mojpb.2017.06.00193 · Cited by 3

Simulating Evolution’s First Steps

Hutton, T. J. (2003) · Lecture notes in computer science · doi:10.1007/978-3-540-39432-7_6 · Cited by 4

Exploring Evolved Multicellular Life Histories in a Open-Ended Digital Evolution System

Moreno, M. A., & Ofria, C. (2022) · Frontiers in Ecology and Evolution · doi:10.3389/fevo.2022.750837 · Cited by 10

Universal biosignatures for the detection of life

Dorn, E. D. (2005) · CaltechTHESIS (California Institute of Technology) · doi:10.7907/08b9-8q96 · Cited by 4

Characterizing Life

Parke, E. C. (2023) · Wiley eBooks · doi:10.1002/9781119555568.ch2 · Cited by 4

The Genetic Coding Style of Digital Organisms

Gerlee, P., & Lundh, T. (2005) · Lecture notes in computer science · doi:10.1007/11553090_86 · Cited by 3

The Role of Pleiotropy and Epistasis on Evolvability and Robustness in a Two-Peak Fitness Landscape

Mehra, P., & Hintze, A. (2024) · Biology · doi:10.3390/biology13121003 · Cited by 2

Cost of resistance to parasites in digital organisms

Kraaijeveld, A. R. (2007) · Journal of Evolutionary Biology · doi:10.1111/j.1420-9101.2007.01319.x · Cited by 2

Nutrient Availability Impacts Intracellular Metabolic Profiles in Digital Organisms

Kannan, K. S. S., Patil, T., Vij, R., Loh, B. J., & Ling, M. H. (2022) · ACTA SCIENTIFIC MICROBIOLOGY · doi:10.31080/asmi.2022.05.1076 · Cited by 1

Virtual Worlds: The Role of Simulation in Ecology

Green, D. G., Klomp, N. I., Rimmington, G., & Sadedin, S. (2020) · Landscape series · doi:10.1007/978-3-030-46773-9_9 · Cited by 2

Simple rules for simple models

Messé, A., Hilgetag, C. C., & Hütt, M. ‐. (2025) · Physics of Life Reviews · doi:10.1016/j.plrev.2025.10.006 · Cited by 1

Biological Complexity and Cognitive Evolution

Jedlička, P., Varchola, J., & Betinsky, J. (2026) · Biological Theory · doi:10.1007/s13752-026-00532-z · Cited by 1

Evaluating the sustainability of an ecological system based on evolutionary multi-agent simulations

Minami, K., Legaspi, R., Tanjo, T., Maruyama, H., & Yamagata, Y. (2014) · Cited by 1

Agent Based Modeling and Artificial Life

Macal, C. M. (2011) · Springer eBooks · doi:10.1007/978-1-4614-1800-9_3 · Cited by 1

Genetic distance in sequence space of evolving populations

Manffra, E. F., Kantz, H., & Ragwitz, M. (2003) · Complexity · doi:10.1002/cplx.10088

Self-protection maintains diversity of artificial self-replicators evolving in cellular automata

Sayama, H. (2003) · NASA/DoD Conference on Evolvable Hardware · doi:10.1109/eh.2003.1217673

Thesis Speciation in Digital Organisms

Chow, S. S., & Chow, S. S. (2005)

Personal Informatics and Evolution in the Digital Universe

John, J. L. (2014) · Synthese Library/Synthese library · doi:10.1007/978-3-319-07121-3_13

Host-symbiont coevolution in digital and microbial systems

Zaman, L. (2014) · Michigan State University Libraries · doi:10.25335/m5n39d

Digital Evolution in Time-Dependent Fitness

Li, Y., & Wilke, C. O. (2004)

Complexity of a Phenotype with Greater Plasticity for Digital Evolvable HardwarePreprint

Salvadeo, P. A., Veca, A., & Castro-Lopez, R. (2017)

The epistemic role of fiction in scientific models

Katic, A. (2020) · Theoria Beograd · doi:10.2298/theo2003005k

Object file program recombination of existing software programs using genetic algorithms

Foster, B. (2011) · doi:10.22215/etd/2011-09187

Experimenting the Unexperimentable With Digital Organisms

Maitra, A., Lim, J. J. H., Ho, C. J. Y., Tang, A. Y., Teo, W., Alejado, E. L. C., & Ling, M. H. (2024) · Elsevier eBooks · doi:10.1016/b978-0-323-95502-7.00069-5

From valleys to peaks: The role of evolvability in fitness landscape navigation.

Mehra, P., & Hintze, A. (2025) · PubMed · doi:10.1093/pnasnexus/pgaf221

Evolution ecology and optimization of digital organisms

Ray, T. S. (1992)

Digital genetics: unravelling the genetic basis of evolution

Adami, C. (2006) · Nature Reviews Genetics · doi:10.1038/nrg1771 · Cited by 136

Creatures from another world

Harvey, I. R. (1999) · Nature · doi:10.1038/23142 · Cited by 3

Exploring the Evolution of Ecosystems with Digital Organisms

Wilke, C. O., & Chow, S. S. (2005) · doi:10.1093/oso/9780195188165.003.0011

Digital Evolution as a Complex System

Ray, T. S. (1995) · Institutional Repositories DataBase (IRDB)