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Table 3 Effects of modification of bird microbiome on uropygial gland volume and composition of secretions

From: Uropygial gland size and composition varies according to experimentally modified microbiome in Great tits

a

Uropygial gland volume

     
   

Estimate ± SE

df

F

P

 

Year

 

0.20 ± 0.04

1,52

29.6

<0.001

 

Wing length

 

0.53 ± 0.12

1,36

19.6

<0.001

 

Treatment

Nisin

−0.05 ± 0.06

2,52

1.2

0.31

  

TSB

−0.09 ± 0.06

   
 

Sex

 

0.49 ± 0.08

1,36

41.2

<0.001

 

Treatment × Sex

Nisin

0.20 ± 0.09

2,36

4.2

0.018

  

TSB

0.24 ± 0.09

   

b

Uropygial gland composition - PC1

    
   

Estimate ± SE

df

F

P

 

Treatment

Nisin

0.04 ± 0.14

2,28

3.7

0.033

  

TSB

−0.30 ± 0.15

   
 

Sex

 

0.72 ± 0.12

1,22

38.6

<0.001

c

Uropygial gland composition - PC2

    
   

Estimate ± SE

df

F

P

 

Date

 

0.05 ± 0.02

1,19

5.7

0.021

 

Treatment

Nisin

2.29 ± 0.58

2,28

8.8

<0.001

  

TSB

1.97 ± 0.60

   
 

Sex

 

−2.89 ± 0.69

1,19

17.3

<0.001

 

Treatment × Sex

Nisin

2.36 ± 0.91

2,19

5.2

0.01

  

TSB

2.81 ± 0.92

   

d

Uropygial gland composition - PC3

    
   

Estimate ± SE

df

F

P

 

Sex

 

−1.34 ± 0.35

1,22

39.5

<0.001

  1. The compounds produced and their contribution to the principal components are given in Table 1. The table present final models after backward selection. Treatment effects estimates compared to the control are shown.