Interdepedence We rely on and interact with our environment and everything in it.

Ecosystem Recycling

The Water Cycle

The Carbon Cycle

Avatar: Chemical Cycles Watch Avatar and then complete your lab over chemical cycles.

Owl Pellet What did the owl pellets teach us about what the owl ate? What did those animals do for food? Is anybody eating the owl?

Put it all together…

Food Chains and Food Webs Food Chain A single pathway of feeding relationships Food Web Interrelated food chains in an ecosystem

ENERGY So, if all life in earth gets its energy from the sun, then how do we actually receive that energy?

Producers Any organism that makes its own food Photosynthesis and Chemosynthesis Production of organic compounds or biomass

Consumers Any organism that can’t make its own food 1.Herbivores 2.Carnivores 3.Omnivores 4.Detritivores 5.Decomposers

Energy Transfer In an ecosystem, energy flows from the sun to autotrophs, then to the organisms that eat the autotrophs, and then to organsisms that feed on other organisms.

Trophic Level Indicates the organism’s position in a sequence of energy transfers

Energy Transfer Only 10 % of energy is passed on to the next trophic level.

1,000,000 kcal of sunlight 10 kcal 100 kcal 1,000 kcal 10,000 kcal Producers Primary consumers Secondary consumers Tertiary consumers

Why so low? Some organisms escape being eaten Energy used by the prey for cellular respiration cannot be used by the predator to make new biomass Parts of the organism/prey can’t be consumed by the predator No transfer of energy is 100% efficient