Range shifting species reduce phylogenetic diversity in high latitude communities via competition

Acknowledgements We thank Heather Bodie and Debbie Young for assistance in the field, and local landowners for permissions to study and sample damselflies on their land. Brad Duthie provided helpful comments on an earlier version of this manuscript. The project was supported by a NERC DTP fellowship to R.N.L.F. and a start-up grant to L.T.L. provided by the University of Aberdeen. Data accessibility All data used in this study have been deposited in Dryad Digital Repository: https://doi.org/10.5061/dryad.kp89j (Fitt & Lancaster 2017).