Table 1.
SEM statistics
| Models | χ2 | df | P |
| Individual group models | |||
| Mesograzers present (BMA biomass) | 5.58 | 5 | 0.34 |
| Mesograzers absent (BMA biomass) | 7.35 | 5 | 0.19 |
| Mesograzers present (BMA primary production) | 5.58 | 5 | 0.34 |
| Mesograzers absent (BMA primary production) | 7.35 | 5 | 0.19 |
| Multigroup models | |||
| Model A (BMA biomass) | 16.67 | 19 | 0.61 |
| Model B (BMA primary production) | 17.24 | 19 | 0.57 |
Chi-square (χ2) likelihood tests for the individual and multigroup SEM models for benthic microalgae (BMA) biomass and production. When P ≥ 0.05, fitted models are not significantly different from observed data.