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Lecture 21

BIOL 1070 Lecture Notes - Lecture 21: Ground Squirrel, Torpor, Aestivation

Course Code
BIOL 1070
Shoshanah Jacobs

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BIOL1070 Class 21 28 March 2016
Adapting to the Environment
Biomes are ecosystems at a global scale
We can see different patterns going on here
What type of regulatory mechanisms can be found?
Are there global patterns in biodiversity?
Biodiversity goes down as you head to the poles, but there is more population
Biodiversity goes up at the equator, but population goes down
Map of global biodiversity of vascular plants
Red zones have LOTS
White zones are under 100 or so
Blue zones are somewhere in the middle
Ontario has 5000 species, 300 are vascular
o As you move further north, we have less vascular plants, but why?
Gets colder farther north
Water is frozen further north
o In the arctic you just see lichens and moss covering he landscape, but you
wouldn’t see them in the rainforest
The plant version of conformers let themselves dry out and freeze over, then they come
back to life when they are better suited to the environment
Global diversity of amphibian species
Blue is low species diversity (1)
Red is high species diversity (~130)
Strategies in Ectotherms for Survive the Winter
Freeze avoidance
o Their bodies do everything they can to prevent freezing in their tissues
Increased blood sugar
Antifreeze in their veins
o Some alter their behaviour
Move south for the winter
Freeze tolerance
o Use strategies to promote controlled freezing to minimize tissue damage
o Allow themselves to freeze over in a comatose state
Eg wood frog
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