Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Life Sciences
The Predatory Behavior Of Pisaster Ochraceus (Brandt), David A. Jillson
The Predatory Behavior Of Pisaster Ochraceus (Brandt), David A. Jillson
University of the Pacific Theses and Dissertations
The persistence of predator-prey systems in evolutionar time is a function of the efficiency with which the predator obtains its food, and the ability of the prey to avoid ex- tinction. One of the important components of survival of the system is environmental heterogeneity (Huffaker 1958).
Along rocky intertidal regions of the northern Pacific coast of North America, a major predator, the starfish Pisast ochraceus has a dominant effect upon patterns of distribution of many intertidal organisms (Paine 1966). Likewise, the distribution of intertidal fauna exert an effect upon the activities of Pisaster. Other biological interactions such an grazing activities …
Comparative Anatomy And Biology Of Two Species Of The Asteroid Genus Pisaster, Norman William Mayer
Comparative Anatomy And Biology Of Two Species Of The Asteroid Genus Pisaster, Norman William Mayer
University of the Pacific Theses and Dissertations
Interest in the endemic Pisaster was first aroused by the great variation of external color in Pisaster ochraceus. This in turn led to observations of the diversity of the spinous patterns of this sea star. Following the suggestion of Dr. Jool D. hedgepeth it was decided to make an extensive comparison of the common species of Pisaster.
Detailed comparison between Pisaster brevispinus and Pisaster ochraceus have been made only by Fisher (1930) and Verrill (1914). Both of these investigators restricted their observations largely to the endoskeleton and its calcareous protuberances. In addition to analyzing the work of Fisher, an attempt …