Table 1.
Descriptions of variables used in both Cx. tarsalis abundance and infection rate models and relationships between explanatory variables based on the Pearson correlation and principal component analysis. Variables with the same arabic number indicated that the Pearson correlations are larger than 0.8 or have factor loading larger than 0.6 in each component of principal component analysis.
| Variables | Correlation (>0.8) |
PCA component (Factor loading >0.6) |
Variables description | |||
|---|---|---|---|---|---|---|
| LMM | GLMM | LMM | GLMM | |||
| Monthly mean temperature | 1 | 1 | 1 | 1 | Monthly mean temperature of the month of mosquito data collection | |
| 1 month lagged mean temperature | 2 | 2 | 2 | 2 | 1 month lagged mean monthly temperature | |
| 2 month lagged mean temperature | 2 | 2 | 2 | 2 | 2 months lagged mean monthly temperature | |
| 3 months mean temperature | 2 | 2 | 2 | 2 | Including mosquito collection month, and previous 1 and 2 months | |
| Winter mean temperature | 4 | 3 | 3 | From December to February | ||
| Monthly mean degree days | 3 | 3 | 3 | 3 | Monthly mean degree day of the mosquito data collection month | |
| 2 months total of monthly mean degree days | 3 | 3 | 3 | 3 | Created by summing the monthly mean degree days of the month of mosquito data collection and previous month | |
| 3 months total of monthly mean degree days | - | 3 | - | 3 | Created by summing the monthly mean degree days of the month of mosquito data collection, previous one and two months. Not applied in the LMM | |
| Mean temperature fluctuations | 3 | 3, 4 | 3 | 3 | Monthly mean maximum temperature minus monthly mean minimum temperature | |
| 1 months accumulative degree days | 1 | 1 | 1 | 1 | The accumulative degree days of data collection month | |
| 2 months accumulative degree days | 2 | 2 | 2 | 2 | The accumulative degree days of data collection month and previous months | |
| 3 months accumulative degree days | - | 2 | - | 2 | The accumulative degree days of data collection month and previous one and two months. Not used in the LMM | |
| 1 month lagged mean precipitation | - | 4 | - | 4 | 1 month lagged monthly mean daily total precipitation. | |
| Monthly total precipitation | Monthly total precipitation | |||||
| 1 month lagged total precipitation | 4 | 4 | 4 | 1 month lagged monthly total precipitation | ||
| 2 month lagged total precipitation | 2 | 2 | 2 month lagged monthly total precipitation | |||
| Total precipitation of previous year | 4 | 4 | Annual total precipitation of previous year | |||
| 3 months total precipitation | 4 | 4 | The total precipitation of mosquito collection month, and previous one and two months | |||
LMM: Linear mixed model for predicting Cx. tarsalis abundance; GLMM: Generalized linear mixed model for predicting WNV infection rate in Cx. tarsalis; “-”: variable is not used in the model construction.