Evolutionary History
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Evolutionary History 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
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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 - PowerPoint PPT Presentation
Transcript of Evolutionary History
Evolutionary HistoryEvolutionary 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
GeologyGeology
• “Big” time - Geological time periods
• Plate tectonics & continental drift
Time - Geological time periodsTime - Geological time periods
• Hierarchical units of geological time
• Defined by changes in fossils
• Eras named after the animal fossils
• Extinctions occur at boundaries
Vis
ible
an
imal
s
Old animals
First animals
Middle animals
Recent animals
ErasEons
540 mybp 540 mybp →→
Geological Geological timetime
• Know* eras (named after animal
life as fossilized)* absolute timing of eras* 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 Machi
ne
540 mybp 540 mybp →→
245 mybp 245 mybp →→
65 mybp 65 mybp →→
Plate tectonics & continental driftPlate 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
