Allometric relationships in feeding and digestion in the Chilean mytilids Mytilus chilensis (Hupé), Choromytilus chorus (Molina) and Aulacomya ater (Molina): A comparative study

► Mytilus chilensis, Choromytilus chorus and Aulacomya ater co-occur sympatrically. ► M. chilensis have the highest and A. ater the lowest filtration rates and gill areas. ► M.chilensis attains the highest and A. ater the lowest size-specific gut contents. ► Interspecific differences in gut contents correlates with digestive enzyme activity. ► Morpho-functional traits allow M. chilensis to be faster feeder.