Table 1
Mean differences in δ13C and δ15N between fin and muscle values, and linear models (equations, 95% confidence intervals (95% CI) of the estimate and the intercept) fitting muscle δ13C and δ15N as a function of the isotope ratios in fin tissue for each species or group of species (anuran tadpoles and urodele adults). δ13C values were corrected for the lipid content according to Caut et al. (2013). The significance of the mean differences and linear equations is indicated: NS: non-significant, *p ≤ 0.05, **p < 0.01, ***p < 0.001.
| Species | N | Mean difference (fin –muscleraw) | Linear model | |||
|---|---|---|---|---|---|---|
| Equations | ±95% CI estimate | ±95% CI intercept | Adj. r² | |||
| δ13C | ||||||
| Agile frog | 29 | 0.44 ± 0.28*** | δ13Cmuscle = 0.85 × δ13Cfin –5.50*** | 0.13 | 4.39 | 0.86 |
| European tree frog | 14 | 0.19 ± 0.20** | δ13Cmuscle = 0.87 × δ13Cfin –4.80*** | 0.19 | 6.64 | 0.89 |
| Marbled newt | 30 | –0.13 ± 0.36 NS | δ13Cmuscle = 0.70 × δ13Cfin –7.43*** | 0.18 | 4.64 | 0.68 |
| Palmate newt | 25 | –1.44 ± 0.86*** | δ13Cmuscle = 0.71 × δ13Cfin –7.03*** | 0.17 | 4.65 | 0.77 |
| Anuran tadpoles | 43 | 0.36 ± 0.28*** | δ13Cmuscle = 0.86 × δ13Cfin –5.01*** | 0.07 | 2.15 | 0.95 |
| Urodele adults | 55 | –0.73 ± 0.91*** | δ13Cmuscle = 0.65 × δ13Cfin –8.57*** | 0.07 | 1.74 | 0.89 |
| δ15N | ||||||
| Agile frog | 29 | –0.04 ± 0.36 NS | δ15Nmuscle = 0.86 × δ15Nfin + 0.97*** | 0.07 | 0.46 | 0.96 |
| European tree frog | 14 | –0.84 ± 0.30*** | δ15Nmuscle = 1.04 × δ15Nfin + 0.67** | 0.43 | 1.77 | 0.67 |
| Marbled newt | 30 | 0.37 ± 0.45*** | δ15Nmuscle = 1.01 × δ15Nfin –0.48*** | 0.13 | 0.04 | 0.91 |
| Palmate newt | 25 | 0.43 ± 0.95* | δ15Nmuscle = 0.89 × δ15Nfin + 0.40*** | 0.15 | 1.19 | 0.86 |
| Anuran tadpoles | 43 | –0.30 ± 0.51*** | δ15Nmuscle = 0.79 × δ15Nfin + 1.54*** | 0.06 | 0.36 | 0.95 |
| Urodele adults | 55 | 0.40 ± 0.72*** | δ15Nmuscle = 0.92 × δ15Nfin + 0.18*** | 0.10 | 0.73 | 0.87 |
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