Host-parasite Red Queen dynamics with phase-locked rare genotypes

Issue Date

3-2016

Abstract

Interactions between hosts and parasites have been hypothesized to cause winnerless coevolution, called Red Queen dynamics. The canonical Red Queen dynamics assume that all interacting genotypes of hosts and parasites undergo cyclic changes in abundance through negative frequency-dependent selection, which means that any genotype could become frequent at some stage. However, this prediction cannot explain why many rare genotypes stay rare in natural host-parasite systems. To investigate this, we build a mathematical model involving multihost and multiparasite genotypes. In a deterministic and controlled environment, Red Queen dynamics occur between two genotypes undergoing cyclic dominance changes, whereas the rest of the genotypes remain subordinate for long periods of time in phase-locked synchronized dynamics with low amplitude. However, introduction of stochastic noise in the model might allow the subordinate cyclic host and parasite types to replace dominant cyclic types as new players in the Red Queen dynamics. The factors that influence such evolutionary switching are interhost competition, specificity of parasitism, and degree of stochastic noise. Our model can explain, for the first time, the persistence of rare, hardly cycling genotypes in populations (for example, marine microbial communities) undergoing host-parasite coevolution. 2016

Source or Periodical Title

Science Advances

Volume

2

Issue

3

Page

1-7

Document Type

Article

Physical Description

illustrations, graphs

Language

English

Subject

Red Queen; coevolution; cyclic dominance; environmental variability; parasitism; rare species.

Identifier

DOI:10.1126/sciadv.1501548.

Digital Copy

yes

Link to Full Text

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