Table 2 The variables, parameter estimates (β), standard errors (SE), z-values and p-values for two negative binomial generalized linear models of the count of questing and feeding ticks collected in southwestern Quebec, 2007-2008
From: Does high biodiversity reduce the risk of Lyme disease invasion?
Model | Outcome | Explanatory variables | β | SE | z-value | p-value | |
|---|---|---|---|---|---|---|---|
Model 1 | Count of questing larvae | Year | (2008 vs 2007) | 2.18 | 0.97 | 2.25 | 0.02 |
Litter depth | 0.39 | 0.13 | 3.01 | < 0.01 | |||
Temperature | 0.01 | 0.01 | 2.65 | < 0.01 | |||
Deer density | 0.92 | 0.16 | 5.83 | < 0.01 | |||
Model 2 | Count of questing nymphs | Year | (2008 vs 2007) | 1.72 | 0.55 | 3.15 | < 0.01 |
Litter depth | 0.22 | 0.07 | 3.04 | < 0.01 | |||
Temperature | 0.01 | 0.00 | 2.41 | 0.02 | |||
Model 3 | Count of feeding larvae | Proportion of trapped mammals that were Peromyscus spp. | 1.98 | 0.99 | 1.99 | 0.05 | |
Site gradient | −1.68 | 0.55 | −3.05 | < 0.01 | |||
Drainage | 0.11 | 0.04 | 2.68 | < 0.01 | |||
Height of mature trees | 0.42 | 0.21 | 2.06 | < 0.01 | |||
Temperature | 1.46 | 0.43 | 3.42 | < 0.01 | |||
Deer density | 1.10 | 0.23 | 4.80 | < 0.01 | |||
Model 4 | Count of feeding nymphs | Year | (2008 vs 2007) | 1.05 | 0.01 | 10.75 | < 0.01 |
Season | (Summer vs spring) | −0.50 | 0.12 | 4.31 | < 0.01 | ||
Species richness of rodents | −0.18 | 0.05 | −3.49 | < 0.01 | |||
Site gradient | −0.69 | 0.09 | −8.19 | < 0.01 | |||
Species richness of mature trees | −0.04 | 0.02 | −2.49 | 0.01 | |||
Density of mature trees | −0.33 | 0.08 | −4.34 | < 0.01 | |||
Temperature | 0.33 | 0.10 | 3.25 | < 0.01 | |||