4/9
Yet they are not genetically homogeneous.
The same haplotypes can occur across distant oceans.
At the same time, populations frequently retain detectable genetic structure.
This combination is difficult to reconcile with a simple view of unrestricted cosmopolitanism.
9/9
Perhaps the most important lesson for us is that even globally distributed microorganisms have histories.
The challenge is learning how to read them.
7/7
In any case, it is interesting to see how microbial communities generated, exchanged and redistributed evolutionary novelty long before the emergence of eukaryotes, resembling other transitions.
Congratulations to all authors on such a thought-provoking contribution!