Acknowledgements
We would like to thank all the authors for their contributions and the reviewers for the time they put in reviewing the papers. We would also like to sincerely thank Dr Frédéric Adam, Editor-in-Chief of the JDS, for giving us the opportunity to publish this issue. We also thank Ciara Heavin, Managing Editor, for her invaluable help in preparation of this issue. The work on this special issue was partly supported by Australian Research Council funding (LP0453745).