Table 3 Summary of statistical results (and associated Test numbers as identified in the Results section) for analyses of bryozoan hosts and effects of infections on hosts and patterns of covert infections. Statistical results presented for generalised linear modelling (GLM) and generalised linear mixed modelling (GLMM) are presented as Likelihood Ratio Test (LRT) results with the test statistic as D
From: Persistence, impacts and environmental drivers of covert infections in invertebrate hosts
Focus | Test | Statistical test (error distribution) | Test statistica | df | P | Statistical analysis |
|---|---|---|---|---|---|---|
Bryozoan hosts | A1 | GLM (Quasi-Poisson) | 80.683 | 1 | < 0.001 | Live colony size varies over time in all three rivers |
A2 | GLM (Binomial) | 498.68 | 2 | < 0.001 | Proportion of statoblast-producing colonies varies amongst rivers | |
Covert infections | B1 | GLM (Binomial) | 82.826 | 2 | < 0.001 | Proportions vary between rivers |
B2 | GLM (Binomial) | 22.486 | 3 | < 0.001 | Proportions vary over time within rivers | |
B3 | GLM (Binomial) | 40.248 | 6 | < 0.001 | Proportions vary amongst roots within rivers | |
B4 | GLMM (Binomial) Random structure: River/Root/Trip | 9.777 | 1 | 0.002 | Less likely in larger, statoblast-producing colonies | |
B5 | GLMM (Binomial) Random structure: River/Root/Trip | 4.740 | 1 | 0.029 | More likely in conditions of low productivity, low temperature and high dissolved oxygen in small colonies not producing statoblasts | |
B6 | GLMM (Gaussian) Random structure: River/Root/Trip | 8.194 | 1 | 0.004 | High infection severity more likely in conditions of low productivity, low temperature and high dissolved oxygen | |
B7 | GLM (Gaussian) | 5.444 | 1 | 0.007 | Infection severity likely to be reduced in statoblast-producing colonies | |
B8 | GLM (Gaussian) | 2.539 | 1 | 0.042 | Infection intensity likely to be reduced in statoblast-producing colonies | |
B9 | GLM (Gaussian) | 0.434 | 1 | 0.401 | Infection intensity not influenced by colony size |