Acknowledgements
We thank Ilham and Erick Mandelson for the unwavering nightly field
work, and Ingo Grass for critically constructive comments on the
manuscript draft. Arne Wenzel and Xueqing He provided valuable comments.
This study was funded by the Deutsche Forschungsgemeinschaft (DFG,
German Research Foundation)–project number 192626868–SFB 990 in the
framework of the collaborative German-Indonesian research project
CRC990. We declare that the authors have no conflicts of interest.