BIO205H5 Lecture Notes - Lecture 18: Jack Pine, Secondary Succession, Longhouse
Document Summary
The story of two squirrel species: native european red squirrel. The grey squirrel has squirrel pox virus that is not lethal for their species but it is lethal for the red squirrel species. It wasn"t direct competition but some other factor: look at populations as dynamic. Krakatau explodes in 1883: catastrophic, 2/3 of the island disappeared, a new volcano growing year to year on the remaining island, amount of ash blown into the atmosphere caused low global temperature. How would the first organisms arrive on what was left of the island: dispersals of seeds from animal, wind, sea. The damage was catastrophic: before volcano, pyroclastic flow that races down the mountain and very little survive, acidic water. Clearly things have changed after four years: fireweed growing on the edge of the lake, within a few years, you can go fishing in the lake again, development of a community.
