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Lecture 1 Notes - including notes from the text AND the lecture

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Biological Sciences
Marc Cadotte

BIOB50Winter2012 Lecture 1Chapter 1 Ecology The Web of Lifeo There are between 5 and 20 million species on Earth o In the past 1 species went extinct for every thousand mammal species every millenia o The current extinction rate is 100 000 times greater than what it was in the pastprojected extinction rate is supposed to be 10 times greater than now o The past extinction rate was high due to meteor hitting the Earth and changing the temperature eradicating most of the species living on earth at that time o 723 species went extinct due to humansJavan Tiger Carribbean Monk Seal Dodo Tasmanian Wolf Barbary Lion o There have been 7 extinction in the past 10 yearsWest African Black Rhino Baji White Dolphin Golden toad and Spixs Macaw o Extinctions due to destruction of habitat by humansdeforestation etc Biodiversity o In 1992 UN Earth Summit in Rio de Janeiro defined as the variability among living organisms from all sources including diversity within species between species and of ecosystemso Example tree went extinct because it required its seeds to pass through the digestive system of the Dodo and so when the Dodo went extinct so did the trees o Increased biodiversity in ecosystems means healthier ecosystemso Ecology helps us understand where we com
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