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Table 3 Differences in relationship between sperm morphology and mating system/spawning location between 67 and 29 species using GLM a

From: Evolution of sperm morphology in anurans: insights into the roles of mating system and spawning location

Source

d.f.

Mean square

F

P

Sperm total length

    

Mating system

1

0.011

1.322

0.253

Spawning locations

2

0.017

2.212

0.126

Species types

1

0.006

0.663

0.418

Mating system* species types

1

0.015

1.751

0.189

Spawning locations* species types

2

0.014

1.664

0.230

Sperm head length

    

Mating system

1

0.037

3.194

0.077

Spawning locations

2

0.023

2.037

0.137

Species types

1

0.032

2.799

0.098

Mating system* species types

1

0.030

2.578

0.112

Spawning locations* species types

2

0.013

1.163

0.317

Sperm tail length

    

Mating system

1

0.011

0.796

0.375

Spawning locations

2

0.043

2.187

0.059

Types of species

1

0.004

0.264

0.608

Mating system* species types

1

0.037

2.700

0.104

Spawning locations* species types

2

0.044

3.155

0.054

  1. aFor testing evolutionary associations, the regression was forced through the origin.
  2. *For interaction between two variables.