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Table 2 Model selection procedure with the climate variables and year as predictors and the total questing tick density as the response

From: Temporal pattern of questing tick Ixodes ricinus density at differing elevations in the coastal region of western Norway

Year

Relative humidity (RH)

Vapour pressure deficit (VPD)

Temperature

Vegetation height

(RH/VPD)2

(Temperature)2

(RH/VPD)* Temperature

(RH/VPD)* (Temperature)2

(RH/VPD)2* Temperature

(RH/VPD)2* (Temperature)2

Elevation category

date

ns (date, df = 2)

Elevation category*date

AIC

∆ AIC

X

X

 

X

X

X

X

X

X

X

X

    

5966.4

127.8

X

 

X

X

X

X

X

X

X

X

X

    

5971.3

132.7

X

 

X

X

 

X

X

X

X

X

X

    

5965.4

126.8

X

X

 

X

X

X

X

X

X

X

     

5964.5

125.9

X

X

 

X

X

X

X

X

X

 

X

    

5964.5

125.9

X

X

 

X

X

X

X

X

 

X

X

    

5964.5

125.9

X

X

 

X

X

X

X

 

X

X

X

    

5964.7

126.1

X

X

 

X

 

X

X

X

X

X

     

5963.4

124.8

X

X

 

X

 

X

X

X

X

 

X

    

5964.5

125.9

X

X

 

X

 

X

X

X

 

X

X

    

5963.5

124.9

X

X

 

X

 

X

X

 

X

X

X

    

5963.7

125.1

X

X

 

X

 

X

X

X

X

      

5965.2

126.6

X

X

 

X

 

X

X

X

 

X

     

5969.0

130.4

X

X

 

X

 

X

X

 

X

X

     

5967.0

128.4

X

X

 

X

 

X

X

X

       

5967.0

128.4

X

X

 

X

 

X

X

 

X

      

5966.1

127.5

X

X

 

X

 

X

X

        

5965.5

126.9

X

X

 

X

 

X

         

5983.5

144.9

X

X

 

X

  

X

        

5964.9

126.3

X

X

 

X

           

5980.9

142.3

X

X

             

5983.5

144.9

X

  

X

  

X

        

5993.6

155

 

X

 

X

  

X

        

5988.9

150.3

X

X

 

X

  

X

    

X

 

X

X

5840.3

1.7

X

X

 

X

  

X

    

X

X

 

X

5882.7

44.1

X

X

 

X

  

X

    

X

 

X

 

5874.3

35.7

X

X

 

X

  

X

    

X

X

  

5880.9

42.3

X

X

 

X

       

X

 

X

X

5848.1

9.5

X

  

X

  

X

    

X

 

X

X

5838.6

0

 

X

 

X

  

X

    

X

 

X

X

5848.1

9.5

X

X

         

X

 

X

X

5849.4

10.8

  1. X = term included; AIC = Akaike’s information criterion; ∆ AIC = the difference in AIC value between the given model and the model with the lowest AIC; * = interaction term, and all other variables are additive. Note that in the interactions, the term (RH/VPD) means either relative humidity or vapour pressure deficit, depending on which variable was included as the linear effect.
  2. Bold face indicates the best prevailing weather model.