Chapter 38 pt 1

Chapter 38 pt 1 - 0 Chapter 38 Conservation Biology We are...

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Chapter 38 0 We are now living through a biodiversity crisis A rapid decrease in Earth’s great variety of organisms 6 th mass extinction event in Earth’s history Conservation Biology
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Biodiversity is the variety that exists in living organisms Conservation biology Area of science that studies ways to counter the biodiversity crisis Preserve species Protect habitats and ecosystems Reverse habitat loss
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Human activities alter the processes that an ecosystem depends on Trophic structure Energy flow Chemical cycling Natural disturbances These alterations push species towards extinction By the end of the century it is estimated that over half of all currently living plant and animal species will be extinct
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Biodiversity is vital to human welfare Provides food, clothing, shelter, oxygen, medicines, and ecosystem services 25% of all prescriptions are plant based Rosy periwinkle treats cancer Rosy periwinkle is native to Madagascar 8000 species of flowering plants many not studied yet Madagascar has lost 80% of its forests and 50% of its native species!
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Three levels of biodiversity Genetic diversity Essential for evolution and adaptation to the environment Species diversity Ecosystem diversity Most of biodiversity focuses on species diversity Endangered species In danger of extinction throughout all or a significant portion of it’s range Threatened species Species likely to become endangered in the foreseeable future
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Human activities Threaten diversity at all levels
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