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Table 2 The influences of mating system and spawning locations on variation in independent contrasts in sperm morphology across 29 anurans species when correcting the body mass using GLM a

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

Source

Sums of squares

d.f.

Mean square

F

P

Sperm total length

     

Mating system

0.001

1

0.001

0.007

0.932

Spawning locations

0.031

2

0.016

2.266

0.127

Body mass

0.122

1

0.122

17.655

<0.001

Sperm head length

     

Mating system

0.006

1

0.006

0.500

0.487

Spawning locations

0.019

2

0.009

0.785

0.468

Body mass

0.158

1

0.158

13.365

0.001

Sperm tail length

     

Mating system

0.002

1

0.002

0.199

0.660

Spawning locations

0.059

2

0.030

2.849

0.079

Body mass

0.206

1

0.206

19.880

<0.001

Ratio of head to tail

     

Mating system

0.060

1

0.060

0.027

0.870

Spawning locations

0.451

2

0.225

0.103

0.903

Body mass

0.375

1

0.375

0.171

0.684

  1. aFor testing evolutionary associations, the regression was forced through the origin.