We studied the effects of grazing by two species of sea urchins on two species of kelp (Macrocystis
pyrifera and Pterygophora californica) in the San Onofre kelp bed in southern …

As a consequence of free spawning in the unpredictable nearshore environment, marine
species with large fecundities and high pre‐reproductive mortality may be subject to extreme …

… Schroeter, SC 1978. Experimental studies of competition as a factor affecting the distribution
and abundance of purple sea urchins, Strongylocentrotus purpuratus (Stimpson). Ph. …

Indirect facilitation can occur when a species positively affects another via the suppression
of a shared competitor. In giant kelp forests, shade from the canopy of the giant kelp, …

Juvenile sporophytes of the giant kelp, Macrocystis pyrifera (L.) CA Agardh, were transplanted
from local kelp beds to stations located various distances from the outfall from an electrical …

Intertidal field observations have shown that juvenile purple sea urchins Strongylocentrotus
purpuratus are found in higher densities near adults. The same is true for subtidal …

… One of us (SC Schroeter) has observed S, franciscanus in Prince William Sound, Alaska,
and this would be the northern limit (60.5"N, 147" W). The southern limit at Isla Cedros off Baja …

The causes of spatial variation in the recruitment of benthic marine algae are frequently
misunderstood because of difficulties in distinguishing among the many factors that influence the …

Weekly settlement of red and purple sea urchins (Strongylocentrotus franciscanus and S.
purpuratus) was documented at sites in northern and southern California (USA) for 4 …

… osmundacea by epiphytes including encrusting bryozoans (Tarp 1979 ; WP Sousa and
SC Schroeter, … Schroeter, and D. Spiller and for assistance at White's Point, G. Bement, R. …