1. Aim: How do the Processes of Biomagnification & Eutrophication affect Ecosystems?
DO NOW: Interpret the comic!

2. Biomagnification
Higher level consumers accumulating larger quantities of poisonous or toxic substances
Final consumers in a food chain are exposed to the highest concentration of toxins

4. Biomagnification Animation

5. Example Toxins can be dumped into water ecosystems
Toxins include lead, mercury, pesticides
Producers are exposed to toxins
Primary consumers eat plants and now contain a higher concentration of toxins in their bodies than the plants originally contained
Secondary consumers eat primary consumers & now contain an even higher concentration of toxins in their bodies than primary consumers

6. Japan & Mercury Example
Mercury = Toxin
Mercury polluted water ecosystems in Japan
Large fish, fished by fisherman, contained a high concentration of mercury
Humans consumed these large fish & became sick with mercury poisoning

7. PCB’s

8. Eutrophication
An accelerated aging process in a lake or pond, in which the body of water fills in with plant remains and is reduced in size
Destroys aquatic ecosystems

9. Example Fertilizer (with nitrates) enters water ecosystem
Algae grow excessively (algal bloom)
Plants grow too
Competition for sunlight & nutrients death
Decomposers break down dead material & use up oxygen  more death
Fish & other organisms start to die

10. Eutrophic Lake

11. Algal Bloom

12. Lake Eutrophication Animation

13. Video

14. Group Activity What is the name of the toxin?
Which organism is affected by very high toxin concentrations?
Which organism is affected the least by the toxin?

15. Homework
Read txt. pgs , omitting reading on acid precipitation.
On page 128, answer question 2.