Table 1.

Feeding choice experiments in Tylodina perversa.

Feeding choice	N	No choice	Choice
Control: mechanical damage	15	6	9:0
Chimney portion—apical:middle:bottom			4:1:4
T. perversa individual—1:2:3:4:5			2:0:3:2:2
aerophoba individual—1:2:3:4:5			2:1:2:2:2

The total number of replicates is expressed by “N”. “No choice” denotes those experiments where T. perversa did not show a preference within 15 min after the sponges were presented. “Choice” shows the preference and number of times that option was selected.