The World Wide Web Food Chains Food Webs

The World Wide Web Food Chains & Food Webs

ENGAGE What is the major difference between a chain and a web?

EXPLORE Classroom Food Chain – – – Hawk? ? Berries? ? Frogs? ? Insects? ? Sun? ? Snakes? ? What is the ultimate source of energy for everything on Earth? – Sun major supplier of the earth’s energy.

Food Chain The simplest feeding arrangement in an ecosystem.

Where do the arrows point?

Food Webs Many food chains interacting with each other. Shows the movement of energy and matter in an ecosystem.

Click the following button to complete an activity which demonstrates how a food web works.

EXPLORE: Interactions in Ecosystems Tabizi Python & Clendro Hawks – Using Imaginary Animals to Achieve Real Knowledge About Ecosystems – Science Scope January 2007

Categorize Your Cards Producers Herbivores Carnivores

Begin Creating Food Chains Neumelinda Tree Red Tarmal Tabizi Python Rahpsheraga Start each food chain with a producer

Explain The Flow of Energy What is a producer? What is a consumer? Name three different types of consumers. How does energy flow in a food web? What is the earth’s major energy supplier? Energy CANNOT be RECYCLED, it flows through the ecosystem. Most of the energy released is lost in the form of heat.

Biomass

Ecological Pyramid

Ecological Pyramid

Ecological Pyramid • • Which level has has the the most energy? most organisms? least energy?

Ecological Pyramids Energy Pyramid Shows the relative amount of energy available at each trophic level. Organisms use about 10 percent of this energy for life processes. The rest is lost as heat. Biomass Pyramid Represents the amount of living organic matter at each trophic level. Typically, the greatest biomass is at the base of the pyramid. Pyramid of Numbers Shows the relative number of individual organisms at each trophic level.

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.

Energy Pyramid (Trophic Levels) The lowest trophic level of the pyramid represents the producers and contains the most energy. The second level represents the primary consumers. A 90% decrease in useable energy The third level or secondary consumers will have 10% of the energy from the level below to use.

Let’s Practice How many trophic levels are present? 5 Determine the amount of useable energy for the different trophic levels. Level 2: 35 J Level 3: 3. 5 J Level 4: 0. 35 J Level 5: 0. 035 J

ELABORATE Tabizi Python & Clendro Hawks – Using Imaginary Animals to Achieve Real Knowledge About Ecosystems – Science Scope January 2007 Event Cards---What happens to the food web when….

EVALUATE The Lorax – List as many interactions as you can while watching or listening to the story. – Create a food web – Draw a biomass pyramid to show the relative amount of living organic matter at each trophic level.