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2.3 Enriched: The Effects of Bioaccumulation on Ecosystems
(Refer to p. 92 – 103 of BC Science 10)
Amphibians and the environment
Why are frogs so severely affected by pollutants in their environment?
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What are some causes of amphibian loss?
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What is the difference between an insecticide, herbicide and pesticide?
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HOW POLLUTANTS CLIMB THE FOOD CHAIN
How has human activity caused one of the biggest changes/disturbances to ecosystems?
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BIOACCUMULATION
What is bioaccumulation? Is it helpful or harmful?
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Define keystone species.
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What is an example of a keystone species in many forest ecosystems in British
Columbia? Give 3 reasons why.
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How is biomagnification different to bioaccumulation?
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What is red tide?
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PCBs AND THE ORCA
What are PCBs and where do they come from?
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Why are PCBs a concern?
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What is half-life?
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PERSISTENT ORGANIC POLLUTANTS (POPs)
Why is a POP, Persistent Organic Pollutant?
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What is DDT?
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Why do cormorants have the highest bioaccumulation of DDT, according to Table 2.2?
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**Complete CC p. 103 #1-11
HEAVY METALS
What are Heavy Metals and when are they a problem?
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Lead:
Environmental sources:
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Effect on organisms:
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Effect on humans:
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Cadmium:
Environmental sources:
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Effect on organisms:
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Effect on humans:
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Mercury
Environmental sources:
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Effect on organisms:
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Effect on humans:
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REDUCING THE EFFECTS OF CHEMICAL POLLUTION
Two methods used to help solve the problem of chemical pollution include:
1. Trap the contaminant in the soil:
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2. Bioremediation:
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**Complete CC p. 103 #13-21
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