16.3 water quality key concept pollution of earth’s freshwater supply threatens habitat and health
TRANSCRIPT
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16.3 Water Quality
KEY CONCEPT Pollution of Earth’s freshwater supply threatens habitat and health.
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16.3 Water Quality
Water pollution affects ecosystems.
• Pollution can put entire freshwater ecosystems at risk.– Sewage– Farm Run off
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16.3 Water Quality
• Indicator species provide a sign of an ecosystem’s health.– amphibians– top predators– “Canary in a coal mine”
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16.3 Water Quality
Indicator species examples
• Frogs have skin that is permeable to water and they spend their entire immature stage in the water
• This makes them a very valuable indicator species
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16.3 Water Quality
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16.3 Water Quality
Pollutants
Fat Soluble
Retained in tissues of body
Stored in body tissue
Water Soluble
Flushed out of body with water
Must be replaced each day
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16.3 Water Quality
Biomagnification causes accumulation of toxins in the food chain.
• Pollutants can move up the food chain.– predators eat contaminated
prey– pollution accumulates at
each stage of the food chain
• Top consumers, including humans, are most affected.
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16.3 Water Quality
Biomagnification
Measured in Parts
per million (ppm)
The movement of fat-soluble
pollutants through a food chain results in
higher concentration
in the top consumer.Zooplankton
0.123 ppm
Lake trout4.83 ppm
Smelt 1.04 ppm
Herring gull eggs 124
ppm
Phytoplankton
0.025 ppm
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16.3 Water Quality
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16.3 Water Quality
Biomagnification
• Examples: DDT, Mercury, PCB’s
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16.3 Water Quality