Population ratio refers to its N e after versus before this change. B The effect of an increased C to T substitution rate.
Categories A, B, and C are defined in Table 1. In the third set of simulations, an acceleration in the C to T substitution rate was incorporated, thereby modeling an increase in their mutation rate due to the deamination of methylated C's in CpG pairs [ 14 ]. The introduction of this bias resulted in significant deviations of f in either direction from 0. Thus, the value of f can vary considerably when the rates for reciprocal mutations are unequal.
Our weak selection model relies on the fixation probabilities of mutant alleles with additive genie selection and equal mutation rates for reciprocal substitutions. Collectively, the three sets of simulations highlight that the f parameter is complex and can be influenced by a number of different factors [ 4 ].
This complexity limits its biological interpretation and the use of its expected value of 0. Nevertheless, as widely acknowledged, simpler models have their place, since they allow one to maximize analytical power for more limited data, while minimizing the risk of over-parameterization [ 13 , 16 ]. J Mol Evol.
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Correspondence to Bjarne Knudsen. Both authors contributed to the conception and design of this study and to the writing, reviewing, and final approval of this article. Reprints and Permissions. Knudsen, B. Aydin, G. Watters, R. Olson, and J. F Kitchell. Visualizing the food-web effects of fishing for tunas in the Pacific Ocean.
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