AP Biology ch. 56 Global & Local Issues. Biological Diversity ~2 million species identified on Earth...
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Transcript of AP Biology ch. 56 Global & Local Issues. Biological Diversity ~2 million species identified on Earth...
AP Biology ch. 56
Global & LocalIssues
Biological Diversity
~2 million species identified on Earth~8 million species to find~1 billion extinct speciesEX: Mycena luxaeterna (eternal light
mushroom)
Levels of Biodiversity
Genetic Diversity (humans ~1%)
Species Diversity (9,000 birds)
Ecosystem Diversity (US wetlands (marshes, fens, rivers…)
Humans depend upon Nature
Ecosystem provides $33 trillion/year Purification of air and water Reduction of severity of natural disasters Generation of fertile soils Detoxification of waste Pollination of crops
Big Problem: Biodiversity Crisis
Gene pools, species, and ecosystems are disappearing at a faster rate than at any time in the past 100 thousand years
Human population is causing 6th mass extinction
Human Population History
Humans are connected to Nature
Ecological Problems
1. Habitat Destruction
Occurs when humans destroy native habitats!Solution: restore and conserve natural areas
2. Overharvesting
Occurs when wild organisms are harvested at a rate greater than the population can replenish
Solution: practice sustainability
3. Invasive species
Occurs when species are moved by humans and thrive at the expense of other organisms
Solution: Plant native species
4. Pollution
Occurs when contaminants enter the environment
Solution: EPA guidelines
4b. Ozone Depletion
Occurs when chlorofluorocarbons break the chemical bonds of ozone
Solution: Global ban of CFC’s
5. Global Climate Change
CO2 & global temperatures are increasingPolar ice caps are meltinghttp://www.youtube.com/watch?v=UaKqhRTqSlg
Sea levels are risinghttp://geology.com/sea-level-rise/
Solution: alternative energy
5b. Ocean Acidification
Excess CO2 is dissolved into the Ocean lowering pH
Overview of Human Impact
Humans use ecosystem services to liveThe human population rose exponentiallyHumans have altered natural biogeochemical
cyclesHumans must protect these biogeochemical
cycles upon which our survival is dependent