Table 1
(A) Significance of differences in the stable isotope data of different tissues per species, according to Wilcoxon tests and t-tests; (B) results of linear regression of the relationships of dorsal muscle versus fin and scales SI data per species, and the associated regression coefficients of a and b for use in equation (1). P-values are Bonferroni corrected at α 0.05/2 = 0.025 because two sets of tests were derived from the same dataset (or subsets thereof).
| (A) | |||||
|---|---|---|---|---|---|
| Species | Isotope | Relationship | Test type | Test value | P-value |
| European perch | δ13C | Muscle/Fin | t-test | 5.71 | <0.001 |
| Muscle/Scales | t-test | −7.15 | <0.001 | ||
| δ15N | Muscle/Fin | Wilcoxon | 0.00 | 0.002 | |
| Muscle/Scales | Wilcoxon | 55.00 | 0.002 | ||
| Pumpkinseed | δ13C | Muscle/Fin | t-test | 10.81 | <0.001 |
| Muscle/Scales | t-test | −37.15 | <0.001 | ||
| δ15N | Muscle/Fin | t-test | −14.43 | <0.001 | |
| Muscle/Scales | t-test | 21.73 | <0.001 |
| (B) | |||||
|---|---|---|---|---|---|
| δ13C | |||||
| Species | Tissue sampled | Tissue predicted | Test result | a (± 95% CI) | b |
| Perch | Fin | Muscle | F1,8 = 133.5; R2 = 0.94; P < 0.001 | 0.92 (± 0.08) | −3.80 |
| Scale | Muscle | F1,8 = 94.67; R2 = 0.91; P < 0.001 | 1.28 (± 0.13) | 6.08 | |
| Pumpkinseed | Fin | Muscle | F1,16 = 21.05; R2 = 0.54; P < 0.003 | 0.60 (± 0.13) | −13.15 |
| Scale | Muscle | F1,16 = 86.32; R2 = 0.83; P < 0.001 | 0.94 (± 0.10) | −4.36 |
| δ15N | |||||
|---|---|---|---|---|---|
| Species | Tissue sampled | Tissue predicted | Test result | a (± 95 % CI) | b |
| Perch | Fin | Muscle | F1,8 = 93.61; R2 = 0.91; P < 0.001 | 0.97 (± 0.01) | 1.09 |
| Scale | Muscle | F1,8 = 66.89; R2 = 0.88; P < 0.001 | 0.86 (± 0.10) | 3.00 | |
| Pumpkinseed | Fin | Muscle | F1,16 = 26.22; R2 = 0.60; P < 0.001 | 0.59 (± 0.12) | 5.96 |
| Scale | Muscle | F1,16 = 45.12; R2 = 0.72; P < 0.001 | 0.73 (± 0.11) | 4.44 |
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