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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