In Wilkinson, C. Rising ocean temperatures increase the tendency for coral bleaching a condition where zooxanthellae, or yellow-green algae, living in symbiosis with coral either lose their pigments or abandon the coral polyps…. Cengage Learning. These are known as type specimens in the collection. Coral reefs can suffer when the sea star's numbers explode; the echinoderm has a healthy appetite and few predators. Cnidarians are not immune from predation.
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Radial muscle contraction distorts the bell, directing the water jet at angles to the longitudinal axis of the bell, allowing the medusa to steer. Each consists of a spherical or cigar-shaped capsule with an eversible, hollow tubule extending from one end. They use the same nematocysts that catch their food to sting other encroaching corals and keep them at bay. Table Of Contents. Khaled bin Sultan Living Oceans Foundation. They sometimes occur completely separate from other kinds of reefs. Coral aragonite has a higher strontium content than some molluscan aragonite.