The detection of trends in ecosystems depends upon (1) a good description of the
foundation or benchmark against which changes are measured and (2) a distinction …

LW BOTSFORD7, A. BRADBURY 8, A. CAMPBELL 9, JD DIXON10, S. EINARSSON11, PK
GERRING1, K. HEBERT12, M. HUNTER 5, SB HUR 13, CR JOHNSON14, MA JUINIO …

The red sea urchin Strongylocentrotus franciscanus and the purple sea urchin S. purpuratus
are important members of southern California kelp bed communities. We investigated their …

This chapter presents information on recruitment in echinoderms and examines variability in
recruitment. Recruitment means addition of new individuals to a population and may be by …

The California fishery for the red sea urchin, Strongylocentrotus franciscanus, has grown
steadily since its inception in 1972, and the maximum annual catch has exceeded 11,000 …

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 …

Growth and survival of the red sea urchin Strongylocentrotus franciscanus were studied at
18 sites from southern California to Alaska, USA. Growth was determined using tetracycline …

The purple sea urchin Strongylocentrotus purpuratus (Stimpson) has been shown to exhibit
phenotypic variation that is dependent on habitat. The interaction of two common conditions …

Here is a benchmark study of one significant stretch of the Pacific Ocean, the Southern
California Bight. Extending from Point Conception to the Mexican border and out to the 200 …

Intertidal grazing molluscs show striking local and geographic variation in distribution and
body size. Their density is generally greatest in the upper and mid—intertidal zones on rocky …