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Download Evolutionary History - Western Washington University
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Evolutionary History • Evolution does not occur in a vacuum; it depends on: * * * * Geology – distribution of land and water Climate – temperature, precipitation, latitude, ocean currents Chemistry – water, atmosphere, soil Other organisms • Predation, parasitism, mutualism, competition, habitat changes * Fate • Extraterrestrial (and earth-bound) caused extinction events • Probabilities of dispersal, gene change, etc. * Mechanisms of evolutionary change Geology • “Big” time - Geological time periods • Plate tectonics & continental drift Time - Geological time periods • • • geological time Defined by changes in fossils Eras named after the 540 mybp → animal fossils Extinctions occur at boundaries Eras Recent animals Visible animals • Hierarchical units of Eons Middle animals Old animals First animals Geological time • Know 65 mybp → * eras (named after animal life as fossilized) * absolute timing of eras 245 mybp → * relative timing within the eras of important events (see our timeline) * you don’t need to remember the periods, but if you want to, learn them • Mnemonics • UC Berkeley Time Machine 540 mybp → Plate tectonics & continental drift • • • Mechanism * New crust at mid-ocean ridges * Sea floor spreading, carries continents * Subduction under continents Christopher Scotese Web Sites Walk Thru Time – 580 concept frame
