Class Notes (807,343)
Canada (492,710)
Geography (749)
GEOG 205 (26)

March 13th

2 Pages
Unlock Document

McGill University
GEOG 205
Gail Chmura

March 13 , 2013: Megafaunal Extinctions  there are posts on mycourses that clarify questions/problems for the assignment due next class (Monday)  film from Monday covered material going to cover today  there are famous extinctions that have occurred over time  dinosaurs about 190 million years ago  what caused the extinction? human?  no, they were not around at the same time o there were mammals around at the same time, but not humans o only showed up at the beginning of the quaternary  by 11 000 years ago there was another major extinction during the last glacial maximum  mammal content of the earth was much larger  what was lost? lots of animals lost below the laurentide ice sheet  some lost around the world, others only in North America o saber tooth cat, American lion, sloths, short faced bear, mastodon & woolly mammoth  number of mammal genera lost peaked around 10 000 years ago  what was happening then? o beginning of the Holocene, so things were warming up  ice sheets melting, proglacial lakes, permafrost melting o warming of permafrost leads to collapses of land, shifts of ecosystems, shifts in biodomes o are these changes enough to extinct all of those animals?  megafauna were present throughout many fluctuations in temperature  Africa suffered the least in extinctions, but humans were always there  because humans evolved in Africa could animals have adapted to the human presence?  some argue humans rapidly had developed rather effective technologies & arrived in NA with them ie/ clovis points  additional factors to consider: loss of habitat modifiers (ecological/ecosystem engineers)
More Less

Related notes for GEOG 205

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.