Non-genetic inheritance and the patterns of antagonistic coevolution

BMC Evolutionary Biology

Research Article

Marcel Salathé¹  Jan Engelstädter²  Rafal Mostowy³ 

[1] Department of Biology, Center for Infectious Disease Dynamics, Pennsylvania State University, University Park, 16802, PA, USA;Institute for Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092, Zurich, Switzerland;School of Biological Sciences, The University of Queensland, 4072, BrisbaneQLD, Australia;Institute for Integrative Biology, ETH Zurich, 8092, Zurich, Switzerland;Department of Infectious Disease Epidemiology, Imperial College, St Mary’s Campus, Norfolk Place, W2 1PG, London, UK;

关键词: Host;    Parasite;    Coevolution;    Epigenetic inheritance;    Resistance;    Red queen dynamics;   

DOI  :  10.1186/1471-2148-12-93

 received in 2012-01-10, accepted in 2012-05-25,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundAntagonistic species interactions can lead to coevolutionary genotype or phenotype frequency oscillations, with important implications for ecological and evolutionary processes. However, direct empirical evidence of such oscillations is rare. The rarity of observations is generally attributed to inherent difficulties of ecological and evolutionary long-term studies, to weak or absent interaction between species, or to the absence of negative frequency-dependence.ResultsHere, we show that another factor – non-genetic inheritance, mediated for example by epigenetic mechanisms – can completely eliminate oscillations in the presence of such negative frequency dependence, even if only a small fraction of offspring are affected. We analytically derive the threshold value of this fraction at which the dynamics change from oscillatory to stable, and investigate how selection, mutation and generation times differences between the two species affect the threshold value. These results strongly suggest that the lack of phenotype frequency oscillations should not be attributed to the lack of strong interactions between antagonistic species.ConclusionsGiven increasing evidence of non-genetic effects on the outcomes of antagonistic species interactions, we suggest that these effects should be incorporated into ecological and evolutionary models of interacting species.

【 授权许可】

CC BY   
© Mostowy et al.; licensee BioMed Central Ltd. 2012