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Environmental Science
Chapter 10Biodiversity
Notes #1
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BiodiversityWhat happened to the
dinosaurs?A meteor created dust that blocked
the sun?A climate change?A dino with limited predators
destroyed the eggs?Other suggestions?
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Biodiversity
Biodiversity at Risk Biodiversity
Number and variety of species on Earth Most of Earth’s species are concentrated in
certain biomes 1.6 million known species
Why are many unknown? Mostly Insects, Why?
Including unknown – probably 10 to 50 million
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Biodiversity Extinction – disappearance of a species Mass Extinction
Many species at one time/over a short period become extinct
In the past, all probably caused by climate change
Currently happening faster than ever How are humans causing extinction?
Habitat Destruction Hunting (poaching) Exotic Species
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Future of Biodiversity Biodiversity Hot Spots
Areas with many species, in danger of becoming extinct or endangered
Tropical, close to equator, coastal To Save – Large National Parks? Habitat conservation
Plans to protect one or more species in a large area of land
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Biodiversity Between 1900 and 2100 it is expected that about
25% of species will have become extinct.
Why does it matter? We lose potential medicines, loss of genetic
diversity, food sources, can ruin whole ecosystem, ethical and aesthetic reasons, etc…
Loss of Keystone species Species that are important to the proper
functioning of an ecosystem Example: sea otter
They kept the sea urchin population in check