Paleozoic FaunaLast LectureOutlineLectureEES 1040 1st Edition Lecture 18Paleozoic FaunaLast LectureOceanic CirculationOutlineI. The Ordovician Radiation (aka The Great Ordovician Biodiversification Event (GOBE))II. Diversity of Paleozoic FaunaIII. The GOBE: Why?IV. Tectonic events during the OrdovicianLectureI. The Ordovician Radiation (aka The Great Ordovician Biodiversification Event (GOBE))A. The single greatest diversity increase in the history of life1. 4 times more diversityB. Rise of the Paleozoic FaunaC. Started at the beginning of the Middle OrdovicianII. Diversity of Paleozoic FaunaA. Filter feeders1. Articulate brachiopods2. Crinoids3. Bryozoans4. CoralsB. Burrowing suspension feeders1. Bivalve mollusks (clamsC. Increase in bioturbation D. Increase of large nektic predators1. CephalopodsE. Tabulate-stromatoporiod reefs (tab-storm reefs)1. Phylum Cnideria: Class Tabulata 2. Phylum Porifera: Class Stromat toporoideaIII. The GOBE: Why?A. What is the limiting factor on ecosystems1. The availability and exploitation of resources2. Resourcesi. Supplies that can be accesseda. Heterotrophi. Lower organisms on the food chainb. Lower organismsi. Herbivoresc. Herbivoresi. Primary producersd. Primary producersi. Energy and nutrients2. Nutrientsa. Phosphorus, nitrogen, silicon, iron, potassium 3. Sources of Nutrientsa. Upwelling (gyres pushing/causing deep nutrients up)b. Weathering/erosioni. Mountain tops erode from wind and water, fall into ocean, get pushed up through continental crust into mountainii. Sediment recycling c. Volcanic eruptionV. Tectonic events during the OrdovicianA. Closure of Iapetus ocean and forms Appalachian Mt. beltB. Mountains become a source of nutrients as they become weathered1. Sediment recyclingC. Large-scale volcanism
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