Activity: After watching the video clip, record your answer to this question in ISN. -What does Mufasa mean when he says that we are all connected in a circle of life? “Lion King” https://youtu.be/bW7PlTaawfQ “Food Chain” BrainPop video

Warm up… Arrange the following organisms to show who eats whom: killer whale cod fish krill shrimp algae leopard seal

Warm up…continued What might happen to the other organisms if algae were removed from this group? What might happen if the killer whales were removed? Are there any organisms in this group that eat more than one kind of food?

Energy Flow in Ecosystems

All organisms play a role in their ecosystem: Producer (Autotroph) Make their own food (usually through photosynthesis) Ex: plants (even the Venus Flytrap!)

All organisms play a role in their ecosystem: Consumers (Heterotroph) Can’t make its own food Gets energy from eating other organisms Herbivores – eats plants Carnivores – eats animals Omnivores – eats plants & animals Scavengers – eats dead animals

All organisms play a role in their ecosystem: Decomposers Break down waste and dead organisms to return raw materials to the environment Ex: bacteria, fungi, worms

A world with no decomposers?

Venus flytrap – producer Producer or Consumer? Venus flytrap – producer Fly - consumer

Producer or Consumer? Consumer (herbivore)

Producer or Consumer? Producer

Producer or Consumer? Consumer (omnivore)

Producer or Consumer? Consumer (carnivore)

Energy enters an ecosystem as… SUNLIGHT!!! Source of energy!

Food Chain Food chain – shows one path of the flow of energy in an ecosystem Order of the food chain: Sun – energy source Producer 1st level Consumer – eats producers 2nd level Consumer – eats 1st level consumers Decomposer – recycles materials for use by producers

Food web – a model that shows the energy flow through different organisms in an ecosystem. consists of many overlapping food chains in an ecosystem

Food Chain: -describes the feeding relationship between a producer and a single chain of consumers in an ecosystem.

FOOD WEB VS FOOD CHAIN

Summary 3 – What are the three roles that organisms play in an ecosystem. Describe each. 2 – What are two examples of a decomposer? 1 – Create a food chain that includes & ends with you (on your graphic organizer).

Warm Up

Trophic Levels Producers 1st Level (Primary) Consumers 2nd Level (Secondary) Consumers 3rd Level (Tertiary) Consumers 4th Level (Quaternary) Consumers

Ecological Pyramid Models A pyramid is used to illustrate the structure of the trophic levels in a food chain. 3 types of ecological pyramids: Pyramid of numbers Biomass pyramid Energy pyramid

Pyramid of Numbers Compares the number of organisms at each trophic level in a food chain. Typically pyramid shaped, with the largest number of organisms at the producer level:

Biomass Pyramid Shows the amount of living matter in a food chain. Total dry weight (without water) of organisms in a food chain Mass/Area Example: g/m2

Energy Pyramids

Flow of energy When an organism eats, it obtains energy, then uses a lot of energy in life process like growth and movement. This means that only part of their energy is available to the next organism in the food web.

Energy Pyramid Illustrates the amount of energy that moves from one feeding level to another in a food chain or web The greatest amount of energy is available at the producer level The least amount of energy available to going to be a the top of the food chain. Only about 10% of the trophic level’s energy is transferred to the next level.

Energy Pyramids

Summary Complete a pyramid model for your “Pond Water Web”.