Consider a rectangular metapopulation consisting of $x \cdot y$ demes, where $x$ is the number of deme horizontally and $y$ is the number of demes vertically. The population size per deme is $N$ and the migration rate between any two adjacent demes is $m$.


I welcome any kind of assumptions for the purpose of this post.


Can you help me to calculate an expectation of the effective population size $Ne$ of the whole metapopulation?

  • $\begingroup$ I am not an expert in this area but if the initial population in all the demes is homogeneous then you can consider the entire metapopulation as one unit with x × y × N individuals. If the sex-ratios are skewed then you may expect different dynamics. $\endgroup$ – WYSIWYG Apr 27 '16 at 8:35
  • $\begingroup$ Mating is not random in the total metapopulation, the $Ne > x \cdot y \cdot N$ even if (as I assumed in the question) all demes have the same size $N$. $\endgroup$ – Remi.b Apr 27 '16 at 15:24

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