Skip to main content

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