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Table 2 Crepipatella dilatata. Effects of the tidal cycle (12 h), reproductive status (brooding and non-brooding) and season (summer, 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 females

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

351.9

4.17

0.0002

 Reproductive status

1

123.8

0.31

0.5758

 Season

3

1304.2

3.33

0.0253

 Season × reproductive status

3

598.3

1.52

0.2162

 Tidal cycle × season

36

181.5

2.15

0.0001

 Tidal cycle × reproductive status

12

90.1

1.06

0.3839

 Tidal cycle × reproductive status × season

36

60.2

0.71

0.8945

 Error

720

84.3

  

(B) Transfer of mucous cord to mouth

    

 Tidal cycle

12

10,632

4.30

0.0001

 Reproductive status

1

12,683

0.79

0.3770

 Season

3

402,757

25.14

0.0001

 Season × reproductive status

3

33,560

2.09

0.1102

 Tidal cycle × season

36

6478

2.62

0.0001

 Tidal cycle × reproductive status

12

2538

1.02

0.4208

 Tidal cycle × reproductive status × season

36

2948

1.19

0.2050

 Error

720

2470

  

(C) Substrate rasping

    

 Tidal cycle

12

7723

2.76

0.0011

 Reproductive status

1

514,833

38.23

0.0001

 Season

3

38,232

2.83

0.0453

 Season × reproductive status

3

15,797

1.17

0.3274

 Tidal cycle × season

36

8342

2.98

0.0001

 Tidal cycle × reproductive status

12

4838

1.73

0.0557

 Tidal cycle × reproductive status × season

36

4258

1.52

0.0264

 Error

720

2791

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