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Lecture 12

BIO220H1 Lecture Notes - Lecture 12: General Circulation Model, Cold Days, Natural Selection


Department
Biology
Course Code
BIO220H1
Professor
John Stinchcombe
Lecture
12

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Lecture 12 midterm notes
Changes in distribution of species in response to climate change
Evolutionary and genetic consequences
Assume species are found in places that are suitable to them / hospitable
Measure the conditions temperature, precipitation, number of cold days, number
of warm days etc…
Global climate model how conditions will change and then try to find where the
conditions will be found, and allows us to predict how far species have to move
Example: Cyprus swamp
PETM
How can species keep up?
1) Natural changes are slow
2) Strong selection = evolutionary change they become more suited
3) Are the anthropogenic changes happening so fast that species can’t migrate or
evolve?
ANTELOPE EXAMPLE (HORN):
grazers of Canadian land in the mountain west
o they have a summer range and a winter range
o they have to move through natural gas fields which are extracted or natural
gas
o they are good at running away
o they evolved in a climate where they had to escape predatory cats
o the predatory cats skeleton is similar to the African cheetah but mtDNA
shows it’s more related to cougar
not used to barb wire
migrations will be altered by human interventions
find more resources at oneclass.com
find more resources at oneclass.com
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