Life Sciences Commons^™

Wasted And Castrated: Two Diseases Affecting The Ochre Star, Pisaster Ochraceus, In North America, Zoë Zilz

WWU Graduate School Collection

Understanding the diseases that plague marine organisms is essential to the management and conservation of coastal ecosystems, especially in the face of a possible sixth mass extinction. An increase in mass-mortality events, often caused by epizootics, is modifying intertidal ecosystems. When predators that have disproportionately large trophic impacts on their community and maintain community structure (i.e., keystone predators) suffer from widespread population declines it destabilizes population dynamics ecosystem-wide, and can have long-term or sometimes permanent effects. This thesis is comprised of two studies that examined two maladies affecting a keystone predator, the ochre star Pisaster ochraceus, in Eastern Pacific …