Study of how organisms INTERACT with each other and their environment Review Ecology Study of how organisms INTERACT with each other and their environment Use w/Food Chains & Webs Extra Practice wksht

Ecosystems All the biotic (living) and abiotic (nonliving) factors that will INTERACT with each other in some subset of the biosphere. Abiotic factors: soil, water, temperature, elevation, and location on the earth.

Community Groups of many different species of organisms interacting in a particular area (predator prey relationships)

A Community of Animals

Population A group of organisms of ONE species that interbreed and live in the same place at the same time.

A Population of Aliens

Food Chains & Webs Extra Practice Complete the food chains. plant → snail → bird → fox Oak leaf → caterpillar →small bird →_________ 2. pond scum → tadpole →fish →_____________ 3. plant→ ____________→ weasel → fox

Food Chain A food chain shows the flow of energy from one organism to the next.

Producer (autotroph) Producers (autotrophs) are always at the base of the chain. Producers are organisms that make their own food. Plants are producers.

Describe this Food Chain

Describe this Food Chain

Describe the Food Chain

4. What can you tell me about this food web. Where is the energy going 4. What can you tell me about this food web? Where is the energy going? Where did it come from?...

Food Chains & Webs Extra Practice 5. Animals that feed on both plants and animals are called …

Omnivores An omnivore eats both plants and animals. Humans and bears are omnivores.

Herbivore Herbivores are animals that only eat plants. A cow and a deer are herbivores.

Carnivore Animals that eat meat are carnivores. A lion and a wolf are carnivores.

Decomposer A decomposer eats dead or dying organisms.

Producers and Consumers So…producers make their own food (e.g., photosynthesis) and consumers don’t. Is a dog a producer or a consumer? Is a termite a producer or a consumer?

carnivore that is a predator of wildebeest and lions 6. When a population of animal 'X' was introduced into the community, the number of lions increased while the number of wildebeest decreased. Animal 'X' could be a … herbivore (e.g., zebra) carnivore that is a predator of wildebeest and lions carnivore that is a predator of wildebeest but a prey of the lions

A The barn owl population will increase. 7. A community in which barn owls and snakes consume only mice is being observed. If the number of snakes increases, which of the following is most likely to happen first? A The barn owl population will increase. B The mouse population will decrease. C The barn owl population will decrease. D The mouse population will remain the same.

A They occupy different ecosystems. B They occupy different niches. 8. One bird species that feeds on large seeds nests in the same tree as a bird that feeds on small seeds. How are the birds able to coexist? A They occupy different ecosystems. B They occupy different niches. C They occupy different communities. D They occupy different habitats.

Food Webs Many food chains interacting with each other. The arrow always points away from the organism being eaten to the organism doing the eating. Shows the movement of energy and matter in an ecosystem.

coyotes rats insects roadrunners lizards bacteria cacti shrubs Use these animals from a food web to answer questions 9 through 13. Draw a Food web using the plants and animals below. coyotes rats insects roadrunners lizards bacteria cacti shrubs

Pyramid of Numbers Carnivore populations are smaller in comparison to the rest of the ecosystem. They require more food to sustain their lives than the lower organisms. The amount of useable energy that is transferred from trophic level to trophic level only 10%.