Table 1.

 Samples, locality, and genome coverage for the 11 new genomes generated for this study

Species	Geographic locality	Sample ID (population ID)	Average width coverage	Average depth coverage
U. maritimus	Poolepynten, Svalbard	APB (APB)	0.97	10.11
U. maritimus	Chukchi Sea, AK	AK017 (AK)	0.97	9.47
U. maritimus	S. Beaufort Sea, AK	AK034 (AK)	0.98	28.36
U. arctos	Seward Peninsula, AK	BB020 (BB)	0.97	9.26
U. arctos	North Slope, AK	BB034 (BB)	0.97	8.57
U. arctos	North Slope, AK	BB037 (BB)	0.97	9.19
U. arctos	North Slope, AK	BB049 (BB)	0.97	9.43
U. arctos	North Slope, AK	BB059 (BB)	0.97	9.14
U. arctos	Anchorage, AK	EB027 (BB)	0.97	9.59
U. arctos	Douglas River, AK	WB039 (BB)	0.97	8.76
U. arctos	Yellowstone NP	CON001 (YB)	0.97	9.32

For a complete list of samples analyzed see Dataset S1.