Journal
JOURNAL OF THEORETICAL BIOLOGY
Volume 332, Issue -, Pages 65-77Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtbi.2013.04.011
Keywords
Bacterial viruses; Microbial ecology; Complex networks; Bipartite networks; Nonlinear dynamics
Categories
Funding
- James S. McDonnell Foundation
- NSF [OCE-1233760, DMS-1204401]
- Burroughs Wellcome Fund
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205878] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1233760] Funding Source: National Science Foundation
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1204401] Funding Source: National Science Foundation
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Bacteria and their viruses (bacteriophages) coexist in natural environments forming complex infection networks. Recent empirical findings suggest that phage bacteria infection networks often possess a nested structure such that there is a hierarchical relationship among who can infect whom. Here we consider how nested infection networks may affect phage and bacteria dynamics using a multi-type Lotka-Volterra framework with cross-infection. Analysis of similar models has, in the past, assumed simpler interaction structures as a first step towards tractability. We solve the proposed model, finding trade-off conditions on the life-history traits of both bacteria and viruses that allow coexistence in communities with nested infection networks. First, we find that bacterial growth rate should decrease with increasing defense against infection. Second, we find that the efficiency of viral infection should decrease with host range. Next, we establish a relationship between relative densities and the curvature of life history trade-offs. We compare and contrast the current findings to the Kill-the-Winner model of multi-species phage bacteria communities. Finally, we discuss a suite of testable hypotheses stemming from the current model concerning relationships between infection range, life history traits and coexistence in complex phage bacteria communities. (C) 2013 Elsevier Ltd. All rights reserved.
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