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Quantitative Viral EcologyDynamics of Viruses and Their Microbial Hosts$
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Joshua S. Weitz

Print publication date: 2016

Print ISBN-13: 9780691161549

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691161549.001.0001

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Population Dynamics of Viruses and Microbes

Population Dynamics of Viruses and Microbes

(p.57) Chapter Three Population Dynamics of Viruses and Microbes
Quantitative Viral Ecology

Joshua S. Weitz

Princeton University Press

This chapter discusses how virus–host interactions affect population dynamics. Models of virus–host interactions suggest that long-term persistence between a single virus population and a single host population is possible. Population dynamics models demonstrate that one potential effect of a viral infection is to shift a community from bottom-up to top-down control. One hallmark of top-down control is a decrease in host abundance with virus addition. A second hallmark of top-down control is an increase in resource concentration with virus addition. Virus–host population dynamics can exhibit oscillations. These oscillations are typified by phase lags between peaks in population abundances of host and virus, in which the host peak precedes the viral peak. The period of oscillations is often much longer than the latent period time between viral infection and lysis.

Keywords:   viruses, viral population dynamics, microbial populations, oscillatory dynamics, virus–host interactions, viral infection

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