What happens when an organisms cannot get enough energy?

Feeding Relationships• Arrows point to where the

energy goes!• Food Web – network of

all the food chains in an ecosystem

Food Web

Autotrophs vs. Heterotrophs

• Autotrophs – make their own food so they are called PRODUCERS

• Heterotrophs – get their food from another source so they are called CONSUMERS

Types of ConsumersHerbivores- only eat plants Carnivores - only eat animals

Omnivores- eat plants AND animals

Decomposers

Feeds on plant and animal remains

PRODUCERS- produce their own energy

-plants do this through

photosynthesis

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CONSUMERS – consume other

organisms for energy

Consumers that eat producers to get energy:

•Are primary consumers

•Are herbivores (plant-eaters)

Most of the energy the primary consumer gets

from the producer is used by the consumer.

Some of that energy moves into the atmosphere as heat.

Some energy in the primary consumer is

STORED

This energy is available for another consumer (predator).

A Consumer that Eats Another Consumer for Energy:

•Secondary Consumers

Most of the energy the secondary consumer gets

from the primary consumer is used by the secondary

consumer.

-Some of the energy is lost as heat

-some energy is stored and can be passed on to another consumer.

A consumer that eats a consumer that already ate a consumer:

•Tertiary Consumer

Checkpoint• Using the food web below, predict what would

happen if the mouse went extinct. Explain your reasoning

How does that energy flow through an ecosystem?

• Energy flows through an ecosystem in ONE direction– sun or chemicals

– autotrophs

– heterotrophs

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Energy Pyramids

•Amount of available energy decreases for higher consumers

•Amount of available energy decreases down the food chain (or as you go up in the pyramid)

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Energy Pyramids

•It takes a large number of producers to support a small number of primary consumers•It takes a large number of primary consumers to support a small number of secondary consumers

Ecological Pyramids

Energy Pyramid

Biomass Pyramid

Pyramid of Numbers

Trophic Level – each step in a food chain or food web

Pyramid of Energy – amount of energy available at each trophic level

• Most of the energy is used by the organisms for life processes

• Some of the energy is lost as heat

Only 10% of the energy from each trophic level is passed on to the next level

Why are nutrients important ?

95% of your body is made of…

1) OXYGEN

2) CARBON

3) HYDROGEN

4) NITROGEN

• Every living organism needs nutrients to build tissues and carry out essential life functions.

Exit Ticket (Assessment Grade)

• Explain why only 10% of the energy from an organism gets transferred to the next level in an energy pyramid

• Use complete sentences!!!