Table 1.
Number of fishes analyzed, the mean starting fork lengths, the mean incremental lengths (IL), mean δ 13C, mean δ 15N, trophic position (TP), and trophic niche size (as standard ellipse area corrected for small sample size, SEAc) of B. barbus and Squalius cephalus at the conclusion of the mesocosm experiment and the extent to which B. barbus trophic niche overlapped (%) with S. cephalus. Error around the mean represents standard error
| Species | Treatment | n | Mean starting length (mm) | Mean IL (mm day−1) | Mean δ 13C (‰) | Mean δ 15N (‰) | Mean TP | SEAC (‰2) | Overlap (%) |
|---|---|---|---|---|---|---|---|---|---|
| B. barbus | Allopatry | 18 | 77.6 ± 0.96 | 0.34 ± 0.03 | −28.2 ± 0.20 | 11.2 ± 0.05 | 2.79 ± 0.02 | 0.56 | |
| Sympatry | 15 | 77.5 ± 1.31 | 0.41 ± 0.03 | −29.1 ± 0.11 | 10.8 ± 0.05 | 2.68 ± 0.02 | 0.31 | 0 | |
| S. cephalus | Allopatry | 17 | 73.9 ± 1.22 | 0.45 ± 0.05 | −30.3 ± 0.19 | 10.7 ± 0.05 | 2.66 ± 0.02 | 0.54 | |
| Sympatry | 15 | 76.1 ± 1.60 | 0.50 ± 0.01 | −30.7 ± 0.14 | 10.8 ± 0.03 | 2.68 ± 0.01 | 0.21 | 0 |