Acknowledgements
We would like to thank J. Kovaliski for clarification on the data used
in his publication. We are grateful to E. Holmes, J. Mahar and J.
Kovaliski for the useful and stimulating conversations on this study and
K. Helbig and Lindy Lumsden for comments on the draft of the manuscript.
We would like to thank D. Kühnert, A. Gavryushkina and R. Bouckaert for
clarifications on important aspects of their models and their
implementation in BEAST2. This project was partly funded by the Centre
for Invasive Species Solutions (project PO1-B-002).
Computer simulations were partly supported by CIPRES
(http://www.phylo.org)