Host-parasite coevolution in populations of constant and variable size.
BMC Evol Biol
; 15: 212, 2015 Sep 29.
Article
em En
| MEDLINE
| ID: mdl-26419522
ABSTRACT
BACKGROUND:
The matching-allele and gene-for-gene models are widely used in mathematical approaches that study the dynamics of host-parasite interactions. Agrawal and Lively (Evolutionary Ecology Research 479-90, 2002) captured these two models in a single framework and numerically explored the associated time discrete dynamics of allele frequencies.RESULTS:
Here, we present a detailed analytical investigation of this unifying framework in continuous time and provide a generalization. We extend the model to take into account changing population sizes, which result from the antagonistic nature of the interaction and follow the Lotka-Volterra equations. Under this extension, the population dynamics become most complex as the model moves away from pure matching-allele and becomes more gene-for-gene-like. While the population densities oscillate with a single oscillation frequency in the pure matching-allele model, a second oscillation frequency arises under gene-for-gene-like conditions. These observations hold for general interaction parameters and allow to infer generic patterns of the dynamics.CONCLUSION:
Our results suggest that experimentally inferred dynamical patterns of host-parasite coevolution should typically be much more complex than the popular illustrations of Red Queen dynamics. A single parasite that infects more than one host can substantially alter the cyclic dynamics.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Parasitos
/
Evolução Biológica
/
Interações Hospedeiro-Parasita
/
Modelos Genéticos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
BMC Evol Biol
Ano de publicação:
2015
Tipo de documento:
Article