A pelagic drifting giant kelp paddy (Macrocystis pyrifera) with bull kelp (Nereocystis lutkeana) and surf grass (Phylospadix torreyi). Entire giant kelp plants frequently become detached from the ocean floor due to the activities of herbivorous invertebrates and the force of passing waves. Although some of the plant material in this paddy of drifting algae on the open ocean is dead, much of the giant kelp is whole and alive. It continues to produce spores and fosters new kelp growth as it drifts freely in the currents. These huge assemblages of seaweed are havens for many animals that use it as shelter.