1. What is the difference between habitat and niche?
Agenda for Tuesday Jan 5th
Finish/present posters
Food chains

2. If an ecosystem is to be self-sustaining it must contain a flow of energy.
The pathways of energy through the living components of an ecosystem are represented by food chains and food webs.

3. Food Webs and Food Chains
All energy starts with the SUN
Producers – use sun’s energy
Autotrophs – Make their own food

4. Consumers – eat other organisms (heterotrophs)
Primary – eat plants
Secondary – eat primary consumers
Tertiary – eat secondary consumers

5. Types of heterotrophs
Herbivores – plant eaters
Carnivores – meat eaters
Omnivore – both meat and plants
Detritivores – eat decomposing matter (detritus)

6. Decomposers
Decomposers – eat dead organisms (detritivores)

7. Food Chain Feeding relationships among organisms in an ecosystem
Results in energy transfer (shown by arrows)

8. Food Web Interrelated food chains Shows energy transfer
More complex = more stable

9. Energy Pyramid
Shows trophic (feeding) levels and energy available to each level
10% energy gets passed to each level
Lose 90% to living/respiration

10. 1 J of energy 10 J of energy 100 J of energy 1,000 J of energy
Fill in the levels of the food chain with the energy passed on.
1 J of energy
10 J of energy
100 J of energy
1,000 J of energy
10,000 J of energy

11. Fill in the levels of the food chain with the energy passed on.
750,000 J of energy

13. Label the trophic levels (producer, primary consumer, etc
Label the trophic levels (producer, primary consumer, etc.) of each organism in the food chain.
Agenda for Thursday Jan 7th
Go over homework/Food chain practice
Finish notes
Biomagnification

14. Classify each member of the food web as autotroph or heterotroph
Classify each member of the food web as autotroph or heterotroph. Identify the heterotrophs as herbivores, carnivores, or omnivores. Label as primary/secondary/tertiary consumer or producer
Organism
Autotroph/heterotroph
Primary/secondary/tertiary/producer
Herbivore, carnivore, omnivore

15. More biomass at the bottom
-Less mass at upper trophic levels
WHY??

16. Biomass Pyramid

18. Human Impact on food chains/food webs
Introduced toxins
DDT and eagles
Extermination of a species
Wolves

19. Biomagnification and bioaccumulation
Biomagnification = the increase in concentration of toxin as it passes through a food web
Higher level affected more
Bioaccumulation = accumulation of toxins in an organism
accumulate faster than they are broken down or excreted
Lower level affected more

20. Biomagnification of a Toxin in Aquatic Environment
Level
Amount of Toxin in Tissue
Tertiary Consumer µg/g ww
(fish eating birds)
Secondary Consumers µg/g ww
(large fish)
Primary Consumers
(small fish)
µg/g ww
Primary Producers
(algae and aquatic plants)
0.04 µg/g ww

22. The coyote would be which of the following: omnivore, carnivore, or herbivore
Agenda for Thursday Jan 8th
Go over HW/review food chains
Biomagnification/Bioaccumulation