1. Where does most of our energy come from?
Welcome to Class
Where does most of our energy come from?

2. Agenda
Short Video
Ecosystem notes
Food Chains and Food Webs

3. Organization Biosphere – every living thing on Earth
Ecosystem – all organisms and non-living environment in an area
Biotic – living
Abiotic – not living

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

6. Niche The role a species plays in its environment Niche includes
range of conditions the species can tolerate
Methods to obtain resources
# of offspring
Other interactions

7. 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

8. Consumers – eat other organisms (heterotrophs)
Primary – eat plants
Secondary – eat other consumers
Herbivores – plant eaters
Carnivores – meat eaters
Omnivore – eat both meat and plants

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

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

12. Energy Pyramid Shows trophic levels
Feeding levels
How much energy gets passed on to each level
10%