Table 5. Genetic differentiation (F_st) between post-dispersal age cohorts of beluga whales from the eastern Chukchi (Kasegaluk Lagoon) and the Beaufort Seas (Mackenzie-Amundsen).

Pairwise estimates for mtDNA are below the diagonal and for microsatellites above the diagonal. Analyses were conducted on all adults (A) and on all large, and presumably older, adults (B). Sample sizes (n) for the mtDNA comparisons are in column 2 and for microsatellites in row 3. Estimates of age were based on the number of growth layer groups (GLGs) in sectioned teeth.

A. Fst - adults
		Chukchi males	Chukchi females	Beaufort males	Beaufort females
	n =	59	59	62	37
Chukchi males	65		-0.002	0.010	0.012
Chukchi females	62	-0.004		0.014	0.022
Beaufort males	67	0.218	0.268		-0.001
Beaufort females	40	0.182	0.235	0.003
B. Fst—large adults
			Chukchi males	Chukchi females	Beaufort males	Beaufort females
			n =	25	33	45	22
	Chukchi males	29		0.001	0.007	0.006
	Chukchi females	35	0.054		0.014	0.031
	Beaufort males	47	0.118	0.278		0.001
Beaufort females	23	0.117	0.287	-0.023

Adult males: ≥ 350 cm standard length.

Adult females: ≥ 300 cm standard length.

Large/older adult males: ≥ 400 cm (Chukchi) ≥ 415 cm (Beaufort) and/or ≥ 25 GLGs.

Large/older adult females: ≥ 350 cm and/or ≥ 25 GLGs.