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Lecture 21

BIO120H1 Lecture Notes - Lecture 21: Habitat Fragmentation

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Spencer Barrett

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Lecture 21:
Slide 2:
These butterflies can only breed on one plant.
Slide 4:
Butterflies have a population boom in the spring when the flowers bloom, and adults fly around trying
to fid the plats. If they do’t fid ay, they die, if they do, they a reprodue. Habitat fragmentation
is where habitats are split apart with areas of uninhabitable areas inbetween them. Big patches can
sustain populations, small ones cant.
Slide 7:
Left is map of the tailing piles in the study area. Big circles are big piles. The graphs are looking at which
piles are occupied by pikas. The top graph is in the north. Middle is mid bottom is south. In the north
path thigs are good for pikas. I id etwork they are’t doig as well, their oupay is pathy. I
south, they start out at high occupancy they start out high but decline
Slide 8:
A source population can maintain itself, a sink population depends on imports to maintain a population.
Slide 11:
Organismal hypothesis is where organisms exist together because they depend on eachother, they
interact with eachother. Individualistic proposed that there are’t ay iportat iteratios etwee
the species, they exist together because they have the same range of tolerance.
Slide 17:
A is classic organismal hypothesis. D is gleasonean.
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