GEOL 103 Lecture Notes - Lecture 3: Axial Tilt, Natural Selection, Overdetermination
30 May 2018
School
Department
Course
Professor
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GEOL 103
Spring 2018 AEC Notes
Prof: Davis
4/9/18 (Week 2, Class #3) Monday
● Temp, diversity of earth, community
Community:
● Ecosystem, all organisms that live together in a specific place on
earth
● Can be described by interaction on a food web
● 3 tiers
○ Primary Producers
■ Ex: Plants, algae
■ Drive the whole system, energy from the sun
(photosynthesis)
■ Hot temp and chemicals: Extremophile
○ Primary Consumers
■ Ex: herbivores, cows, snails
■ NOT a passive relationship
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2
■ Primary consumers prey on primary producers
● Evolution will affect this relationship
○ Secondary Consumers
■ Ex: Carnivores
■ Pressure to be as efficient as possible
● At surviving, at eating, side-to-side competition
● Evolutionary arms race
○ Evolution → new traits, better protect self in pre/pred
■ Natural selection to preserve self
● Producers, Consumers, 2nd Consumers
● The complexity of these interactions + natural selection = more
diversity!
Global Circulation
● Physical earth affection organisms
● Temp variations and earth’s rotation govern circulation in the
atmosphere, axial tilt= seasons (type of environments)
○ Earth gets sun’s rays from either direct or indirect sunlight
○ Disequilibrium at poles and equator (concentrated sunlight)
● Zones
find more resources at oneclass.com
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Document Summary
Ecosystem, all organisms that live together in a specific place on earth. Can be described by interaction on a food web. Drive the whole system, energy from the sun (photosynthesis) Pressure to be as efficient as possible. Evolution new traits, better protect self in pre/pred. The complexity of these interactions + natural selection = more diversity! Temp variations and earth"s rotation govern circulation in the atmosphere, axial tilt= seasons (type of environments) Earth gets sun"s rays from either direct or indirect sunlight. Disequilibrium at poles and equator (concentrated sunlight) Use natural experiments that have already run in the past. The past is overdetermined and the future is underdetermined by observations. Make accurate predictions based on what we do/know (ie about the effects) Can"t be 100% certain because of so much factor variation. Only need one thread from past to make the predictions about what happened as a result of that thread.
