| Lake Kasumigaura | ||||
| Model | R | R2 | p-value | AIC value |
| i) | 0.919 | 0.844 | 6.40 × 10−5 | 69 |
| ii) | 0.909 | 0.827 | 1.04 × 10−4 | 70 |
| Lake Kitaura | ||||
| iii) | 0.887 | 0.786 | 2.75 × 10−4 | 74 |
| iv) | 0.880 | 0.774 | 3.54 × 10−4 | 75 |