Single diet feeding experiment data from: Invasive bryozoan alters interaction between a native grazer and its algal food. A Canadian Healthy Oceans Network Ecosystem Function Project, EF-11.

Rate of mass change (mg/day) of kelp tissue disks (Saccharina latissima) in experimental feeding arenas in the laboratory containing snails (Lacuna vincta) offered one dietary item and autogenic control arenas with no snails. Data for each replicate container includes herbivore absence/presence, diet (kelp encrusted by invasive bryozoan M. membranacea or non-encrusted kelp), and rate of mass change of kelp disk.