Table 4 GLM models analysing the effects of parasitaemia in the first capture of sedge warbler males on their: (1) mating success (binomial variable: 1—success, 0—no success; logit link function, modelled probability that success = 1), (2) mating date (continuous variable; Gamma distribution, identity link function) and (3) breeding success (binomial variable: 1—success in rearing at least one fledgling during the season, 0—no success; logit link function, modelled probability that success = 1), as response variables. Arrival date and year (continuous variable; coded as a successive season between 2002 and 2019) were included as covariates in all models. *p < 0.05.
Model (n) | Response | Predictors | Estimate | SE | χ2 | p |
|---|---|---|---|---|---|---|
1 (98) | Mating success | Parasitaemia | < < − 0.01 | 0.004 | 0.022 | 0.882 |
Arrival date | − 0.04 | 0.028 | 2.144 | 0.143 | ||
Year | − 0.07 | 0.048 | 2.193 | 0.139 | ||
2 (70) | Mating date | Parasitaemia | < < − 0.01 | 0.007 | 0.343 | 0.558 |
Arrival date | 0.46 | 0.106 | 18.397 | < 0.0001* | ||
Year | 0.14 | 0.108 | 1.709 | 0.191 | ||
3 (83) | Breeding success | Parasitaemia | < < 0.01 | 0.003 | < < 0.001 | 0.994 |
Arrival date | − 0.03 | 0.029 | 0.753 | 0.385 | ||
Year | − 0.10 | 0.037 | 7.498 | 0.006* |
