Begg et at: Stock discrimination of Scomberomorus queenslandicus and S. munroi 
657 
Ba 
Ca 
Fe 
I 2 
8 
§ 
o 
43 
i 40 
<0 
.b 
37 
_ 80 
o> 
§40 
8 
c 
o 
O 
More-2 Rock-1 Rock-2 Bow-2 
Area 
More-2 Rock-1 Rock-2 Bow-2 
Area 
Li 
More-2 Rock-1 Rock-2 Bow-2 
Area 
Mg (F=14 43, P<0.0001) 
22 
17 
c 12 
8 
c 
o 
o 
More-2 Rock-1 Rock-2 Bow-2 
Area 
Mn (F=5.68, P<0.002) 
„ 3 
CD 
a 
E 
More-2 Rock-1 Rock-2 Bow-2 
Area 
Na (F=20.90, P<0.0001) 
More-2 Rock-1 Rock-2 Bow-2 
Area 
P (F=1 7.21 , P<0 0001) 
More-2 Rock-1 Rock-2 Bow-2 
Area 
150 
TO 
O) 
■§• 130 
c 110 
More-2 Rock-1 Rock-2 Bow-2 
Area 
S (F=2.20, N.S.) 
„ 580 
CT) 
I 
■§• 500 
f 420 
Sr (F=1.44, N.S.) 
_ 2600, 
2400 
c 2200i 
o 
O 
More-2 Rock-1 Rock-2 Bow-2 
Area 
More-2 Rock-1 Rock-2 Bow-2 
Area 
Figure 2 
Mean elemental concentrations (± standard deviation) of school mackerel otoliths sampled from the different 
areas and F-values determined from ANOVA showing significant elements among samples (df=3, 80; 
N.S. nonsignificant result). Minimum elemental detection limits of the inductively coupled plasma atomic 
emission spectroscopy (ICP-AES) (all units are in mg/Kg, except Ca which is measured as a %): Ba = 0.78; Ca = 
544; Fe = 23.9; K = 353; Li = 15.0; Mg =10.9; Mn = 1.10; Na = 1250; P = 54.1; S =191; Sr = 3.24. 
ing a strong effect of age at collection in measure- 
ment of the elemental composition of otoliths in this 
area (HSD, P<0.05). Sodium showed the most sig- 
nificant differences in these univariate analyses (Fig. 
2) and was selected as the common variable for 
scatterplots in Figure 3. Scatterplots of the relation- 
ships between Na and the other significant elemen- 
tal concentrations revealed similar spatial patterns 
