1. Where does all the energy originate?
Agenda for Monday Sept 26th
Ecology Video
Ecology Notes
Learning Targets
I can differentiate between abiotic and biotic factors
I can draw a food chain/food web and identify the trophic levels
I can describe how energy is transferred through a food web/food chain

2. Ecology
Def. – study of relationships between living organisms and their environment

3. Organization Organisms – individual member of a population
Populations – members of a single species that live in once place at a single time
Communities – living parts of ecosystem
Lake – fish, turtle, algae, bacteria, etc

4. Organization
Ecosystem – all organisms and non-living environment in an area
Biotic – living
Abiotic – not living
Biome – large group of organisms that share same climate and have similar types of communities
Biosphere – every living thing on Earth

6. Define abiotic and biotic.
Agenda for Wednesday Sept 28th
Finish notes
Practice
Learning Targets
I can differentiate between abiotic and biotic factors
I can draw a food chain/food web and identify the trophic levels
I can describe how energy is transferred through a food web/food chain

8. Habitat vs. Niche Habitat – an area where an organism lives
Niche – the role a species plays in its environment
range of conditions the species can tolerate
Methods to obtain resources
# of offspring
Other interactions
Compare and contrast habitat and niche

9. Food Webs and Food Chains
All energy in an ecosystem starts with the SUN
Producers – use sun’s energy
Make their own food - autotrophs
Plants

10. Consumers – eat other organisms (heterotrophs)
Primary – eat plants
Secondary – eat other consumers

11. Herbivores – plant eaters
Carnivores – meat eaters
Omnivore – both meat and plants
Detritivores – eat decomposing matter (detritus)

12. Decomposers
Decomposers – eat dead organisms (detritivores)

13. Food Chain
Pathway of feeding relationships among organisms in an ecosystem
Results in energy transfer (shown by arrows)

15. Food Web Interrelated food chains
Shows energy transfer (shown by arrows)

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

17. More biomass at the bottom of a food chain/food web.
As we go up in a food chain/food web there is les mass.

18. More organisms at the bottom of a food chain/food web.
More producers
As we go up in a food chain/food web there are less organisms.
Less secondary consumers

20. What happens to a food chain when we remove the producers?
Agenda for Thursday Sept 29th
Bioaccumulation/biomagnification
Species Relationships

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

22. Biomadnification and bioaccumulation
Biomagnification = the increase in concentration of toxin as it passes through successive levels of the food web

23. Biomadnification and bioaccumulation
Bioaccumulation = the accumulation of a contaminant or toxin in or on an organism from all sources (e.g., food, water, air)
accumulate in living things and stored faster than they are broken down or excreted

24. Biomagnification of a DDE in Aquatic Environment
Level
Amount of DDE 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

25. Calculating amounts
Suppose an osprey eats 200g of fish per day. The fish tissue consumed by the osprey has an average DDT concentration of 0.1μg/g. How much DDT is the osprey consuming in one day?
(200g fish/day)(0.1 μg DDE/g fish) = 20 μg DDT/day