Acknowledgements:
We thank all the organisations and people that have assisted in the
collection of samples. The Canadian Department of Fish and Wildlife and
Fish and Wildlife Departments of Alaska and Oregon assisted us by
providing information about sampling locations. In particular we thank
Dr. Darcie Neffs of the Alaskan Department of Fish and Wildlife for
collecting tubesnouts from Juneau (TuAK), Prof. Mike Bell for collecting
the Alaskan threespine stickleback (TsAK) and Ms. Treasa Tufts who
collected the ninespine sticklebacks. Dr. Sarah Smith-Wuitchik is
thanked for her advice for sampling fish. We also thank Dr. Jon Mee and
the members of the Rogers Lab at the University of Calgary who provided
advice on finetuning the DNA extraction protocol. Finally, we would like
to thank Ms. Hazel Cameron-Inglis for her assistance during a month and
a half of field work. Funding for this work was provided by Alberta
Innovates (20150252) and NSERC Discovery (RGPIN/03950-2017).