BIO SCI 97 Chapter Notes -Mesozoic, Tetrapod, Devonian
30 Jan 2014
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Document Summary
Adaptive radiations = groups of organisms form many new species with adaption that allow them to fill different ecological roles (niches) in communities: early paleozoic: cambrian explosion & subsequent radiation. 2nd most impactful extinction event because life forms were aquatic. Snapshot to see what happens after big extinctions and how different life forms dominate landscape at different times. Second greatest mass extinction; lowering of sea level (ecospace on continental shelves) and cooling; some groups of trilobites went extinct. 100 familes extinct: early paleozoic: cambrian explosion & subsequent radiation. - rapid increase in animal diversity in fossil record: early paleozoic warm extensive shallow reefs (lots of life such as kelp, cooling at end ordovician first great mass extinction (100 families lost) 2nd most impactful extinction event because life forms were aquatic: mid to late paleozoic. - great diversification of land plants; insects and tetrapod evolved and diversified. - fishes had bones growing in the fin areas: cooling at end devonian.
