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Table 4 Relation between sperm functional traits and total sperm length

From: Is sperm morphology functionally related to sperm swimming ability? A case study in a wild passerine bird with male hierarchies

 

Before social status manipulation

After social status manipulation

Fixed effects

VCL

Proportion of motile sperm

VCL

Proportion of motile sperm

Slope ± SD

F (df1,df2)

p

Slope ± SD

F (df1,df2)

p

Slope ± SD

F (df1,df2)

p

Slope ± SD

F (df1,df2)

p

Intercept

−43.87 ± 71.08

  

−6.05 ± 4.18

  

75.36 ± 74.99

  

−3.86 ± 4.28

  

Social rank

 

3.04 (3,36.1)

0.041

 

5.51 (3,36.1)

0.003

 

1.04 (3,34.9)

0.39

 

0.87 (3,35.5)

0.46

 Subordinate 1

10.06 ± 5.61

  

0.97 ± 0.33

  

9.73 ± 6.29

  

0.59 ± 0.37

  

 Subordinate 2

15.42 ± 5.87

  

0.94 ± 0.34

  

−0.42 ± 6.26

  

0.32 ± 0.37

  

 Subordinate 3

9.15 ± 5.51

  

0.17 ± 0.32

  

2.14 ± 6.27

  

0.07 ± 0.37

  

Sperm total length

1.64 ± 1.45

0.0003 (1,47.1)

0.98

−0.11 ± 0.08

0.68 (1,47.2)

0.41

0.63 ± 1.43

0.1 (1,47.7)

0.76

−0.08 ± 0.08

0.001 (1,46.3)

0.99

Time

−0.37 ± 0.03

561.43 (1287)

> 0.001

− 0.02 ± 0

357.45 (1287)

> 0.001

−0.36 ± 0.03

617.31 (1282)

> 0.001

−0.01 ± 0

235.71 (1282)

> 0.001

Body mass

3.19 ± 1.79

3.05 (1,42.8)

0.09

0.09 ± 0.11

0.75 (1,42.9)

0.39

2.95 ± 1.88

2.36 (1,42.8)

0.13

0.01 ± 0.11

0.01 (1,45.9)

0.91

Tarsus length

1.24 ± 3.23

0.14 (1,46.3)

0.71

0.22 ± 0.19

1.31 (1,46.4)

0.26

−4.16 ± 3.74

1.21 (1,38.6)

0.28

0.22 ± 0.22

0.97 (1,40.9)

0.33

Social rank x Sperm total length

 

1.47 (3,44.9)

0.23

 

3.25 (3,45)

0.030

 

0.7 (3,44)

0.55

 

1.16 (3,46.4)

0.34

 Subordinate 1

−3.26 ± 2.06

  

0.04 ± 0.12

  

−3.03 ± 2.49

  

0.02 ± 0.14

  

 Subordinate 2

−4.37 ± 2.01

  

0.17 ± 0.12

  

0.43 ± 2.07

  

0.12 ± 0.12

  

 Subordinate 3

0.2 ± 1.88

  

0.28 ± 0.11

  

−0.9 ± 2.23

  

0.19 ± 0.13

  

Social rank x Time

 

0.98 (3287)

0.40

 

8.59 (3287)

> 0.001

 

1.34 (3282)

0.26

 

1.71 (3282)

0.17

 Subordinate 1

0.06 ± 0.04

  

0.005 ± 0.002

  

0.01 ± 0.04

  

−0.002 ± 0.002

  

 Subordinate 2

0 ± 0.04

  

0.01 ± 0

  

0.06 ± 0.04

  

−0.004 ± 0.002

  

 Subordinate 3

0.02 ± 0.04

  

0.01 ± 0

  

0.06 ± 0.04

  

−0.001 ± 0.002

  

Sperm design x Time

−0.02 ± 0.01

0.02 (1287)

0.89

− 0.0003 ± 0.0005

0.02 (1287)

0.89

0 ± 0.01

3.78 (1282)

0.053

−0.0004 ± 0.0004

0.20 (1282)

0.65

Social rank x Total length x Time

 

3.96 (3287)

0.009

 

0.38 (3287)

0.76

 

2.35 (3282)

0.07

 

0.49 (3282)

0.69

 Subordinate 1

0.02 ± 0.01

  

0.0007 ± 0.0008

  

−0.01 ± 0.01

  

−0.0001 ± 0.0007

  

 Subordinate 2

0.04 ± 0.01

  

0.0001 ± 0.0007

  

−0.03 ± 0.01

  

0.0006 ± 0.0006

  

 Subordinate 3

0.01 ± 0.01

  

0.0005 ± 0.0007

  

−0.01 ± 0.01

  

0.0003 ± 0.0006

  
  1. Estimates from linear mixed models, and F and p values from ANOVAs with Kenward-Roger approximation to the degrees of freedom. Contrast are done against the dominant males. Bold p-values are significant (alpha = 0.05)
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BMC Ecology and Evolution

ISSN: 2730-7182

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