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Table 3 Crepipatella dilatata. Effects of the tidal cycle (12 h) and season (autumn, winter and spring) on radular activity (extrusions h−1) for (A) mucous ball removal, (B) transfer of mucous cord to the mouth and (C) substrate rasping in males

From: The influence of season and the tidal cycle on division of labour by the radula during feeding in the estuarine brooding gastropod Crepipatella dilatata (Calyptraeidae)

Source

df

MS

F

p

(A) Mucous ball removal

 Tidal cycle

12

39.10

1.06

0.3918

 Season

2

4072.6

110.6

0.0005

 Tidal cycle × season

24

70.24

1.90

0.0073

 Error

275

36.8

  

(B) Transfer of mucous cord to mouth

 Tidal cycle

12

3115.8

5.58

0.0001

 Season

2

100,567.1

180.2

0.0001

 Tidal cycle × season

24

2490.8

4.46

0.0001

 Error

275

557.8

  

(C) Substrate rasping

 Tidal cycle

12

2643.1

1.12

0.3396

 Season

2

31,468.6

15.31

0.0511

 Tidal cycle × season

24

4691.1

2.00

0.0054

 Error

275

2346

  
  1. Data were analyzed by two-way repeated measures ANOVA; p values in italic indicate statistical significance