9/18/14 objective: how do living things get their energy? do now: recall the levels of organization,...

9/18/14

Objective: How do living things get their energy?

Do Now:

Recall the levels of organization, what is an ecosystem?

Ecology

• ecology: the interactions between organisms and their environment

• Biotic factors: all of the living things

• Abiotic factors: non-living conditions

Types of organisms

• Producers (autotrophs): make their own food– Energy from the sun

• Consumers (heterotrophs): eat other organisms for energy– Herbivores: eat plants– Carnivores: eat animals– Omnivores: eats both

plants and animals– Decomposers: break down

remains of plants and animals

Food Chains• Draw the Arrows:

Grass Insect Bird Fox

Where does the initial energy come from?

How does each organism obtain their energy?

This is a food chain

A food chain is a sequence in which energy is transferred from one organism to the next as each organism eats another organism

Food Webs

• Food webs are interconnected food chains that show many feeding relationships

hawk

Bird snake

mouse insect

seeds grass

- The arrows show the FLOW OF ENERGY

Food WebsEnergy flows

in one direction. Which direction?

Energy flows from producers to herbivores to carnivores to decomposers

Factors that affect stability

- Food webs more stable than food chains

- Removing or adding organisms can be harmful to the stability