EESA01H3 Lecture 9: Lecture 9

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12 Jan 2012
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Lecture 9 y ch9 up to 274. y ch13 not concluding air pollution. y exam: everything from lecture 1-12. Cumulative exam. y thurs dec 1st is makeup lecture 12. y 60-65% questions from material after midterm. For stability. y more biodiversity means more adaptable system. y hurricanes, climate change, occurs. Biodiversity provides everything for long term survival on earth. Loss of biodiversity is what we cause. y dinosaurs, dodo birds, passenger pigeons, thousand of bacteria are extinct. y extirpation: extinct from a certain place. Ex: tiger that used to be on some island and everyone hunted it so its gone but there s the same species in other places, just extirpated from that island. y endangered: on the break of becoming extinct. When something specific is lost, hard to recover. Keystone species (predatory animals like lions, tiger, polar bears. levels: Huge impact on decline of species below them.

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