Table 3. Summary of mixed ANOVAs showing the effects of colony islands on δ15N and δ13C values for different species.
| δ15N | δ13C | |||||||
| Species | df (num) | df (den) | F | P | df (num) | df (den) | F | P |
| Fucus vesiculosus | 1 | 11.7 | 7.01 | 0.0217 | 1 | 12 | 0.07 | 0.7926 |
| Periphyton | 1 | 16.2 | 7.80 | 0.0129 | 1 | 14 | 0.29 | 0.5972 |
| Ulva spp. | 1 | 13.9 | 7.69 | 0.0150 | 1 | 14 | 0.09 | 0.7631 |
| Cladophora glomerata | 1 | 13 | 9.99 | 0.0075 | 1 | 13 | 0.28 | 0.6039 |
| Idotea balthica | 1 | 10.8 | 7.33 | 0.0206 | 1 | 10.9 | 0.94 | 0.3531 |
| Theodoxus fluviatilis | 1 | 13.2 | 9.25 | 0.0093 | 1 | 14.1 | 0.90 | 0.3595 |
Statistically significant values are indicated in bold. Note that each species was analysed separately. For Fucus vesiculosus, the average for each individual (as calculated from the three thallus sections) was used.