Table 1.
Principal Component Analysis (PCA) and Generalized Additive Model (GAM) for groups of organisms using biological and physical variables as effects; n = 28.
| Model | PCA (variance, %) | GAM | |||||
|---|---|---|---|---|---|---|---|
| Residual Df | F or t | Deviance explained | R-sq (adj) | GCV | Scale est. | ||
| Chlorophyll a Terms: | 85.2% | 71.2% | 0.68 | 75.31 | 64.55 | ||
| +Temperature | −3.19** | ||||||
| +NO3 | 1.6 | ||||||
| +Mesozooplankton | 2.3** | ||||||
| PE Terms: | 64.1% | 99.3% | 0.92 | 39.57 | 20.93 | ||
| Temperature | 7.65 | 22.74*** | |||||
| NO3 | 2.64 | 9.99** | |||||
| Mesozooplankton | 8.98 | 16.8*** | |||||
| Synechococcus Terms: | 75.2% | 95.8% | 0.9 | 8.05 | 3.72 | ||
| NO3 | 2.46 | 37.64*** | |||||
| Dinoflagellates | 6.24 | 3.23* | |||||
| Mesozooplankton | 5.79 | 19.89*** | |||||
| Prochlorococcus Terms: | 81% | 81.5% | 0.68 | 1.83 | 1.00 | ||
| Temperature | 7.52 | 3.96** | |||||
| NO3 | 3.08 | 1.19 | |||||
| Microzooplankton | 1.00 | 2.01 | |||||
| Microzooplankton Terms: | 85% | 70.6% | 0.57 | 204.4 | 144.56 | ||
| Temperature | 2.06 | 9.37** | |||||
| Chlorophyll a | 3.84 | 4.68** | |||||
| Mesozooplankton | 1.00 | 0.003 | |||||
| Mesozooplankton Terms: | 85.2% | 85.4% | 0.74 | 53.09 | 29.45 | ||
| Temperature | 3.02 | 4.39* | |||||
| Chlorophyll a | 2.50 | 6.98** | |||||
| Microzooplankton | 6.74 | 1.70 | |||||
Residual Degrees of Freedom (Df).
+t-value for linear adjust and F-value for smooth adjust.
Significance level: *p < 0.1; **p < 0.01; ***p < 0.001.