Table A.2
Model for the proportion of mature four- and five-year-old whitefish in the Gulf of Bothnia during 1998–2014.
| Group | Effect | DF | F value | P | AIC |
|---|---|---|---|---|---|
| Age 4 | Sex | 1 | 26.24 | <0.001 | 3124.7 |
| Sea area | 1 | 5.30 | 0.0214 | ||
| Year | 1 | 408.02 | <0.001 | ||
| Sex*area | 1 | 13.45 | 0.000 | ||
| Sex*year | 1 | 25.83 | <0.001 | ||
| Area*year | 1 | 5.44 | 0.019 | ||
| Age 5 | Sex | 1 | 16.52 | <0.001 | 4894.0 |
| Sea area | 1 | 56.91 | <0.001 | ||
| Year | 1 | 49.07 | <0.001 | ||
| Sex*area | 1 | 5.16 | 0.023 | ||
| Sex*year | 1 | 16.41 | <0.001 | ||
| Area*year | 1 | 57.22 | <0.001 |
The probability of anadromous whitefish being mature (binomial mature vs. immature) at age four or age five according to binomial regression models, when sex, sea area (southern and northern) and year and their interactions (*) were used as predictors. Sample sizes for mature and immature fish were 3479 and 1668 at age 4 and 3260 and 644 at age 5, respectively. Fish caught in June-December included.
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