GEOL 3070 Lecture Notes - Lecture 27: Cephalopod, Ocean Acidification, Gastropoda
25 Apr 2017
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Document Summary
>90% of all living (and fossil) animals are invertebrates. 5 phyla surveyed here (particularly conspicuous in ocean) Spongin with network of opal (or calcite) spicules. Flagellated collar cells sweep water out while capturing food particles. Food drawn to mouth and simple dead-end digestive cavity. Benthic and mainly sessile, with basal disc (allows them to attach to the bottom) Most live in caco3 (aragonite) cups called corallites. Ahermatypic: don"t build reefs (live in solitary form) Coral supplies nutrients (n,p) and co2 to algae. Algae gives reefs their color (also benthic and encrusting algae) Most live shallower than 25m (need sunlight for algae) Killed by exposure to air for more than a few hours. Volcano must sink slower than coral growth (~1 cm/yr) Great barrier reef: >2900 reefs covering 344,000 km2. Fish, mollusks, crustaceans, and starfish prey on coral. Fish and sea urchins also graze on benthic reef algae.
