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Differences in the mean δ 15N of macroinvertebrates and investigated food sources at the sites 50 m–300 m and 500 m–2000 m downstream to the enrichment inlet. Significance was tested using individual t‐tests.
| Reach | 50–300 m | 500–2000 m | t | df | p | ||
|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||||
| BY22 | 6.4 | 5.6 | 6.5 | 5.7 | −0.1 | 228.7 | 0.93 |
| RB21 | 10.2 | 7.5 | 5.8 | 4.9 | 6.0 | 248.9 | <0.001 |
| RB22 | 11.9 | 8.5 | 4.6 | 4.9 | 8.2 | 176.7 | <0.001 |
| RBA3 | 15.6 | 14 | 8.9 | 6.7 | 5.4 | 202.2 | <0.001 |
| SB21 | 70.9 | 50 | 47.7 | 39.9 | 5.8 | 484.1 | <0.001 |
