1. What was the common method of determining the probability of observing a beet?
The authors used the generalised stepwise mutation model (S12), in which the change in the number of repeat units forms a geometric distribution with a variance Vg: Exp(0.36) (S11) (5% and 95% quantiles of 0.02 and 1.08).
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2. What is the definition of a DB?
DB: Discrete Uniform[1; 5]. TL: Custom Discrete[1; DB] defined as follows: the authors assumed that the probability of observing WCR increases with the time since introduction, and the authors arbitrarily chose that the probability of observing the beetles n years after the actual introduction year (pn) was such that pn = 3 2 pn − 1; the authors also assumed that once at Ns, the WCR population was observable with a probability of 1.
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3. What is the method for estimating BF and PW?
The extreme low end of the distribution (representing the simulations with parameter values that gave results closest to the observed data) is then used to estimate BF and PW (S7,S8).
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4. What is the likely invasion scenario of the western corn rootworm?
Most likely invasion scenarios of Europe by the western corn rootworm deduced from mean assignment log-likelihood of individuals from the European outbreaks (columns) to putative source populations (rows), and FST-values between pairs of populations (in parentheses).
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