Table 3.

Stable-carbon (δ¹³C) and stable-nitrogen (δ¹⁵N) isotope values (‰) in muscle tissue of harbour porpoises from Scandinavian waters.

	Region	n	Mean ± SD	Range		ANOVA
δ13C	southern	13	-17.8 ± 0.7	-18.4 – -16.2	F3, 28:	p < 0.001	a
	southwest	9	-18.0 ± 0.3	-18.3 – -17.3			b
	Nordland	7	-19.0 ± 0.4	-19.5 – -18.2			c
	Finnmark	3	-19.2 ± 0.1	-19.3 – -19.1			c
δ15N	southern	13	15.6 ± 1.5	12.9 – 18.1	F3, 28:	p < 0.001	a
	southwest	9	13.4 ± 0.6	12.6 – 14.4			b
	Nordland	7	12.6 ± 0.4	12.1 – 13.1			c
	Finnmark	3	13.2 ± 0.3	12.9 – 13.4			bc

Geographic differences among groups are indicated: areas followed by the same letter are not significantly different. n = number of samples.