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Table 1 The influences of mating system and spawning locations on variation in independent contrasts in sperm morphology across 67 anurans species 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

0.034

1

0.034

4.864

0.031

Spawning locations

0.059

2

0.029

4.421

0.016

Sperm head length

     

Mating system

0.086

1

0.086

9.016

0.004

Spawning locations

0.120

2

0.060

6.514

0.003

Sperm tail length

     

Mating system

0.057

1

0.057

5.401

0.023

Spawning locations

0.085

2

0.043

4.132

0.021

Ratio of head to tail

     

Mating system

0.441

1

0.441

0.158

0.694

Spawning locations

56.556

2

28.278

0.667

0.517

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