Table 3.
Effects of spawning year, time spent at sea (seawinter), stage at stocking (stockstage), and sex on the reproductive success (RS) of adult Atlantic salmon returning in the Malbaie River to spawn between 2002 and 2004. RS was obtained from parental allocation analysis based on microsatellites and modeled as a Poisson distribution. The middle part shows a model comparison based on a chi-square analysis of deviance. The lower part of the table reports partial regression coefficients (±SE) for each factor tested by fitting generalized linear models (GLMs) to salmon data (n = 539 adults). Coefficients were fitted relative to 2002 MSW female fish stocked as fry. A ‘×' denotes a second-order interaction term
| Model 1 | Model 2 | Model 3 | |
|---|---|---|---|
| Model description | year + (seawinter + stockstage + sex)2 * | year + seawinter + stockstage + sex | year + (seawinter + stockstage)2 |
| Deviance | 1980.69 | 2009.9 | 1995.47 |
| df | 527 | 532 | 531 |
| P | n.a. | <0.001 | <0.001 |
| year: 2003 | −0.18 (0.09) | −0.13 (0.09) | −0.17 (0.09) |
| year: 2004 | −0.66 (0.10)*** | −0.65 (0.10)*** | −0.66 (0.10)*** |
| seawinter:ssw | −1.06 (0.32)*** | −1.24 (0.08)*** | −0.69 (0.19)*** |
| stockstage:smolt | 0.69 (0.27)* | −0.48 (0.15)** | 0.34 (0.23) |
| stockstage:wild | 0.52 (0.21)* | −0.09 (0.11) | 0.26 (0.16) |
| sex:male | 0.36 (0.29) | −0.20 (0.08)** | n.a. |
| ssw × smolt | −0.69 (0.38) | n.a. | −1.33 (0.29)*** |
| ssw × wild | −0.34 (0.27) | n.a. | −0.68 (0.21)** |
| ssw × male | 0.17 (0.21) | n.a. | n.a. |
| smolt × male | −1.05 (0.41)* | n.a. | n.a. |
| wild × male | −0.62 (0.30)* | n.a. | n.a. |
n.a., not applicable.
0.05 > P > 0.01; **0.01 > P > 0.001; ***P < 0.001.
Second-order interactions are included for variables in brackets. For instance, model 1 expands to year + seawinter + stockstage + sex + seawinter × stockstage +seawinter × sex + stockstage × sex.