 Natural
Disasters
 Unnatural
Disasters
◦Biomagnification
◦Deforestation
◦Global Warming
◦Eutrophication
Increase in concentration of a pollutant
from 1 link in a food chain to another
Due to –
Bioaccumulation: increase in
concentration of toxins in an organism
or population
- DDT & Eagles
-
Even small amounts of toxins can make it into
organisms in high enough levels to cause
problems
Pollutants have in common:
• Long – lived
• Mobile
• Soluble in Water
• Biologically active
• Heavy metals like lead & mercury
Removal of indigenous forests & woodlands
Results in:
• Alteration of Local and global climates
• Global warming
• Drier Climate (less plants, land holds less
water)
• Soil Degradation (erosion & silting of water)
• Extinction/loss of Species
• Desertification
• Urban Development
• Increased Farming
Process where bodies of
water receive excess
nutrients that stimulate
excessive plant growth
- Especially
nitrogen
Causes of Global Warming
Industrialization
• Deforestation
• Pollution
• Natural Causes/Sources
•
Results of Global Warming
•
•
•
•
Ave. Temperatures have risen
1.4oF/0.8oC
Arctic Ice Disappearing
Coral Reefs Bleaching due to
warmer ocean
More extreme weather events
(wildfires, heat waves, tropical storms)
•
Glaciers Melting
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Causes of Unbalanced Ecosystems