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Spatially-induced nestedness in a neutral model of phage-bacteria networks

View ORCID ProfileSergi Valverde, View ORCID ProfileSantiago F. Elena, Ricard Solé
doi: https://doi.org/10.1101/125377
Sergi Valverde
1ICREA-Complex Systems Lab, Universitat Pompeu Fabra - PRBB, Dr. Aiguader 88, 08003 Barcelona
2Institut de Biologia Evolutiva (IBE), CSIC-UPF, Psg Maritim Barceloneta, 08003 Barcelona
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Santiago F. Elena
3Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-UPV, 46022 Valencia, Spain
4Instituto de Biología Integrativa de Sistemas (I2SysBio), Consejo Superior de Investigaciones Científicas-Universitat de Valencia, 46182 Paterna, Valencia, Spain
5Santa Fe Institute, 1399 Hyde Park Road, New Mexico 87501, USA
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Ricard Solé
1ICREA-Complex Systems Lab, Universitat Pompeu Fabra - PRBB, Dr. Aiguader 88, 08003 Barcelona
2Institut de Biologia Evolutiva (IBE), CSIC-UPF, Psg Maritim Barceloneta, 08003 Barcelona
5Santa Fe Institute, 1399 Hyde Park Road, New Mexico 87501, USA
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Abstract

Ecological networks, both displaying mutualistic or antagonistic interactions, seem to share common structural traits: the presence of nestedness and modularity. A variety of model approaches and hypothesis have been formulated concerning the significance and implications of these properties. In phage-bacteria bipartite infection networks, nestedness seems to be the rule in many different contexts. Modeling the coevolution of a diverse virus-host ensemble is a difficult task, given the dimensionality and multi parametric nature of a standard continuous approximation. Here we show that this can actually be overcome by using a simple model of coevolving digital genomes on a spatial lattice and having exactly the same properties, i.e. a genome-independent fitness associated to fixed growth and death parameters. A matching allele model of phage-virus recognition rule is enough to generate a complex, diverse ecosystem with heterogeneous patterns of interaction and nestedness, provided that interactions take place under a spatially-constrained setting. It is found that nestedness seems to be an emergent property of the coevolutionary dynamics. Our results indicate that the enhanced diversity resulting from localized interactions strongly promotes the presence of nested infection matrices.

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Posted April 07, 2017.
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Spatially-induced nestedness in a neutral model of phage-bacteria networks
Sergi Valverde, Santiago F. Elena, Ricard Solé
bioRxiv 125377; doi: https://doi.org/10.1101/125377
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Spatially-induced nestedness in a neutral model of phage-bacteria networks
Sergi Valverde, Santiago F. Elena, Ricard Solé
bioRxiv 125377; doi: https://doi.org/10.1101/125377

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