Table 2.
Results from within-species multiple regression models of log-transformed Cd and Hg concentrations (µg/g dw) in the liver and muscle in relation to measures of size and age. Significant results are shown in bold. Liver concentrations were lipid normalized
| Species/metal/tissue | Estimate (β coef) | SE | t-value | Partial R2 | P-value | |
|---|---|---|---|---|---|---|
| A) Arctic cod—cadmium concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.11, n = 57, F-statistic = 3.348, P-value = 0.043 | ||||||
| (Intercept) | 0.224 | 0.180 | 1.244 | - | 0.219 | |
| Age | 0.109 | 0.042 | 2.571 | 0.04 | 0.013 | |
| Length | − 0.016 | 0.008 | − 2.102 | 0.07 | 0.040 | |
| B) Arctic cod—mercury concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.53, n = 57, F-statistic = 30.55, P-value < 0.001 | ||||||
| (Intercept) | − 1.750 | 0.117 | − 15.024 | - | < 0.001 | |
| Age | 0.049 | 0.028 | 1.800 | 0.03 | 0.077 | |
| Length | 0.019 | 0.005 | 3.769 | 0.50 | < 0.001 | |
| C) Arctic cod—mercury concentrations (µg/g dw) in the muscle | ||||||
| R2 = 0.76, n = 57, F-statistic = 85.07, P-value < 0.001 | ||||||
| (Intercept) | − 1.709 | 0.093 | − 18.46 | - | < 0.001 | |
| Age | 0.063 | 0.022 | 2.882 | 0.04 | 0.006 | |
| Length | 0.025 | 0.004 | 6.399 | 0.72 | < 0.001 | |
| D) Sculpin—cadmium concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.03, n = 30, F-statistic = 0.3924, P-value = 0.679 | ||||||
| (Intercept) | − 0.260 | 0.654 | − 0.397 | - | 0.694 | |
| Age | − 0.001 | 0.060 | − 0.014 | - | 0.989 | |
| Length | 0.021 | 0.031 | 0.690 | 0.03 | 0.496 | |
| E) Sculpin—mercury concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.15, n = 30, F-statistic = 2.423, P-value = 0.108 | ||||||
| (Intercept) | − 1.466 | 0.371 | − 3.947 | - | 0.001 | |
| Age | − 0.013 | 0.034 | − 0.382 | - | 0.706 | |
| Length | 0.034 | 0.018 | 1.911 | 0.15 | 0.067 | |
| F) Sculpin—mercury concentrations (µg/g dw) in the muscle | ||||||
| R2 = 0.26, n = 30, F-statistic = 4.67, P-value = 0.020 | ||||||
| (Intercept) | − 1.362 | 0.402 | − 3.384 | - | 0.002 | |
| Age | 0.033 | 0.037 | 0.877 | 0.02 | 0.388 | |
| Length | 0.032 | 0.019 | 1.689 | 0.24 | 0.103 | |
| G) Ringed seal—cadmium concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.06, n = 38, F-statistic = 1.157, P-value = 0.326 | ||||||
| (Intercept) | 0.919 | 0.353 | 2.242 | - | 0.031 | |
| Length | 0.007 | 0.006 | 1.224 | 0.05 | 0.220 | |
| Axial Girth | − 0.005 | 0.007 | -0.639 | 0.01 | 0.421 | |
| H) Ringed seal—mercury concentrations (µg/g dw) in the liver | ||||||
| R2 = 0.70, n = 38, F-statistic = 40.88, P-value < 0.001 | ||||||
| (Intercept) | − 1.268 | 0.269 | − 4.718 | - | < 0.001 | |
| Length | 0.006 | 0.005 | 1.296 | 0.01 | 0.203 | |
| Axial Girth | 0.018 | 0.006 | 3.169 | 0.69 | 0.003 | |
| I) Ringed seal—cadmium concentrations (µg/g dw) in the musclea, b | ||||||
| R2 = 0.04, n = 29, F-statistic = 1.044, P-value = 0.316 | ||||||
| (Intercept) | 0.005 | 0.178 | 0.025 | - | 0.980 | |
| Length | 0.001 | 0.001 | 1.022 | - | 0.316 | |
| J) Ringed seal—mercury concentrations (µg/g dw) in the muscleb | ||||||
| R2 = 0.56, n = 30, F-statistic = 35.01, P-value < 0.001 | ||||||
| (Intercept) | − 1.252 | 0.173 | − 7.241 | - | < 0.001 | |
| Length | 0.008 | 0.001 | 5.917 | - | < 0.001 | |
aCadmium concentrations were not log-transformed—model assumptions met without data transformation
bAxial girth was removed from analysis in the ringed seal muscle regressions due to a VIF value over 5