Table 2
Summary of the GAMs fitted to the diatom principal component (PC) scores. Descriptors significantly explaining variance are presented in descending order of their contribution to the GAMs and represented as follows: ⁎p-value < 0.05; ⁎⁎p-value < 0.01; ⁎⁎⁎p-value < 0.001. DESCRIPTORS: total phosphorus (TP), conductivity (Cond), nitrate (NO3−), pH, temperature (T), dissolved oxygen (DO), dissolved organic carbon (DOC), five-day biological oxygen demand (BOD5). COLUMN LABELS: proportion of variance (%; variance explained by the PCA axis), deviance explained (%; deviance is a measure of residual variation around the GAMs analogous to the sum of squares in linear regression), AICC (Akaike Information Criterion), LogLik (log-likelihood), df (degrees of freedom).
| PCA axes | Proportion of variance | Deviance explained | AICC | LogLik | df | Descriptors |
|---|---|---|---|---|---|---|
| PC1 | 31.4 | 24.2 | 6403 | −3174 | 27.3 | TP⁎⁎⁎ |
| Cond⁎⁎⁎ | ||||||
| NO3−⁎⁎⁎ | ||||||
| pH⁎⁎⁎ | ||||||
| PC2 | 24.6 | 27.1 | 5972 | −2952 | 32.7 | TP⁎⁎⁎ |
| Cond⁎⁎⁎ | ||||||
| T⁎⁎⁎ | ||||||
| pH⁎⁎⁎ | ||||||
| DO⁎⁎⁎ | ||||||
| PC3 | 11.1 | 29.2 | 4655 | −2303 | 23.6 | TP⁎⁎⁎ |
| pH⁎⁎⁎ | ||||||
| T⁎⁎ | ||||||
| DOC⁎⁎ | ||||||
| PC4 | 9.8 | 17.9 | 4702 | −2326 | 24.6 | NO3−⁎⁎⁎ |
| T⁎⁎⁎ | ||||||
| BOD5⁎⁎ | ||||||
| PC5 | 6.2 | 11.4 | 4111 | −2023 | 31.9 | Cond⁎⁎⁎ |
| TP⁎⁎⁎ | ||||||
| pH⁎⁎⁎ | ||||||
| DOC⁎⁎⁎ | ||||||
| BOD5⁎⁎⁎ |
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