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Termination of an evolutionary linkage by demographic failure of loss of distinctiveness.
Life span of species
1 million years on Average.
99% of species on earth have gone extinct.
-Growth of gonwanan ice sheet
-sustained periof of high seal level
Global cooling / anoxia of oceans
K-T event (giant meteor)
Loss of Dinosaurs
Susatained cold temperatures
54% of all marine families lost
84% of all marine genera
96% of all marine species
Loss of most all species of large birds
Loss of large mammals
Astronomical Cycles Generating long-term cycles in climate related to extinction.
Tilt of the earth on its axis
shape of the earths orbit around the sun
precession of the equinoxes
Responses of organisims to global climate change.
Shift geographic range to an area with suitable climate.
In Mountains species moved down hill when it got colder
In Equitorial areas when rain is sparse the species move to refugia.
Name the green house gases
What effects do green house gases have
Allow solar radiation to penetrate the earths atmosphere and warm the surface of the earth.
Inhibit the re-radiation of heat into space
Modern day climate change is atributed to what 2-things?
Increase in Atomspherice green houses
Increase in mean global temperatures
Why may many species who survived previous climate changes not be able to survive again
Human reduction of suitable habitats
Vocabulary / Review items