Extinction and Biodiversity Extinction is a natural process 99 of all organisms

Extinction and biodiversity extinction is a natural

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How many species are at risk of extinction? 15
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Recovery o The recovery time of a forest is nearly 40 years , whereas the recovery of a marine area is only about 10 years. o Disturbances such as agriculture can take 50 years to recover, logging can take 30 years to recover, and deforestation can also take up to 30 years to be recovered. Why we should preserve biodiversity 1. New medicines from untested species 25% of all drugs come from nature. Nature is our free pharmacy! A biodiversity treaty stated that developing nations should receive royalties from the plants we sell for medicine, but the US didn’t sign it. We should pay for them so that the developing nations can preserve them! 2. Improved ecosystem function Ecosystems are our human life support and is based on biodiversity. 3. Food from new species Only 30 species currently provide 90% of the food that we eat, but there are 1 million described plant species! There are 600 species of dogs, but only 50 species of beans. We can obviously create more variety! ECOL 1000 Lecture #8 February 4, 2016 Green Revolution: creating new types of crops with high nutrient quality Modern crops are bred for fast growth, short stalks, and large number of kernels per ear/stalk. They require a lot more energy to grow than wild crops! Wild varieties of crops are disease, drought, and pest resistant Why we preserve biodiversity Besides for medicine , ecosystem services , and food , more reasons include Preservation of genetic diversity o Doomsday vault preserves seeds in long term storage for future use in case the earth is destroyed. 16
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o Humans have begun a “clean-freak” culture where we are out to destroy microbes. These
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