TABLE 4.
Differences in the mean δ 15N of macroinvertebrate feeding types and investigated food sources between enriched and non‐enriched reference sites.
| Feeding type/food source | Reference | Enriched | t | df | p | ||
|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||||
| Active filter feeder | 5.7 | 0.9 | 28 | 29 | 12 | 254 | <.001 |
| Passive filter feeder | 5.2 | 0.9 | 42 | 27 | 12 | 69.7 | <.001 |
| Grazer | 5.2 | 1.5 | 65 | 62 | 12 | 154 | <.001 |
| Shredder | 5.2 | 5.2 | 28 | 35 | 15 | 701 | <.001 |
| Predator | 7.4 | 0.7 | 22 | 27 | 4.4 | 66.3 | <.001 |
| Phytobenthos (PB) | 4.7 | 2.1 | 11 | 11 | 8 | 215 | <.001 |
| Particulate organic matter (POM) | 0.5 | 1.2 | 1.9 | 5.4 | 3.8 | 273 | <.001 |
Note: Significance was tested using individual t‐tests.