Fig. 4From: 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)Crepipatella dilatata. Total radular activity (extrusions h−1) in relation to salinity in the Quempillén estuary. Pooled data from all tidal cycles observed. a Brooding (n = 40) and non-brooding (n = 40) females. b Males (n = 42). Dashed line: critical salinity for radular activityBack to article page