Energy Flow in a Food Chain/Webs
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1 Energy Flow in a Food Chain/Webs
2 Energy Every living thing needs energy in order to live Every time consumers do something (run, jump) they use energy Plants get their energy from photosynthesis Energy is needed for living beings to grow
3 The Food Chain Brainpop - Food Chains A food chain shows how living thing gets energy Energy is passed from creature to creature Food chains begin with plant-life, and end with animal-life. Arrows are used to represent energy being passed
4 Different types of Food Chains There can be many links in food chains but not TOO many If there are too many links, then the animal at the end would not get enough energy
5 Food Chain with Decomposers Food chains make a full circle! Energy is passed from plant to animal to animal to decomposer and back to plant!
6 Is a bunch of food chains in one Several connections may occur between organisms Ex: Snake gets energy from frogs and rabbits Food Web
7 Lets see how well you understand what we learned so far: GAME re.com/content/animals/ki dscorner/games/foodchain game.htm
8 Food Chain Reaction A change in the size of one population in a food chain will affect other populations. This interdependence of the populations within a food chain helps to maintain the balance of plant and animal populations within a community.
9 Food Chain Reaction /chain_reaction/play_chainreaction.cfm /chain_reaction/play_chainreaction.cfm oodchain
10 Consumers that eat producers Are primary consumers = First- Order to get energy:
11 A consumer that eats another consumer for energy: Is called a secondary consumer= Second- Order
12 A consumer that eats a consumer that already ate a consumer: Is called a tertiary consumer= Thirdorder
13 A consumer that eats a consumer that ate a consumer that already ate a consumer: Is called a quaternary consumer = Fourth- Order
14 Transfer of Energy in a Food Chain The transfer of energy (arrows) 1. Sun to producer 2. To primary consumer 3. To secondary consumer 4. To tertiary consumer 5. To quaternary consumer
15 At the bottom of this page! Make a food web using the following animals. (write words don t draw) Include the Arrows showing energy.
16 Mountain Lion Second-order heterotrophs Hawks Snakes Deer First-order heterotrophs Rabbits Mice Seed Eating Birds Autotrophs Grass Shrubs Trees Name Date Period # Decomposers
17 ENERGY PYRAMID Another way of showing the transfer of energy in an ecosystem
18 How is energy being used? Some of the energy is being used in the consumer Some energy is lost as heat Some energy is stored and can pass on to another consumer
19 How it works ECO-PYRAMIDS: The concept of a pyramid is useful to describe the energy (trophic) levels of organisms, the amount of biomass, and amount of energy transferred from one trophic level to another. The base of a pyramid is the widest part. Producers are at the base of the eco-pyramid. There are more producers than any type of organism in an ecosystem. 100% of the energy captured from the sun is in the base. There is much more biomass in the base than anywhere else in the pyramid. The second level up a pyramid is smaller than the base. Here is where the primary consumers are placed. There are fewer primary consumers than producers. There is only about 10% of the biomass that is found in the base. Only 10% of the energy captured from the sun by the producers is passed up to this level. The third level up the pyramid is smaller than the second. Here is where the secondary consumers are placed. There is only about 1% of the biomass that is found in the bass (That's 10% of the biomass in the level below it!). This level has only 1% of the energy that is captured from the sun. (That's 10% of the energy in the level below it!) The fourth level is the last level. It is the last level because there is not enough energy left to pass up to another level. This is the level of the tertiary consumer. Only 0.1% of the energy captured by the producers makes it up to this level. Only 0.1% of the biomass in the ecosystem is contained in this level as well. GENERAL PATTERNS IN THE ECO-PYRAMID: "THE 10% RULE - Only 10 % of the energy from a level is passed up to the next level - Only 10 % of the biomass from a level is passed up to the next level There are always fewer individuals in the populations as you go up the pyramid. The higher you go on the pyramid, the less energy is available!
20 How much energy is lost? At each level only 10% of the energy available is passed on. 10% Rule Video clip Brainpop Energy Pyramid
21 The trophic level is the position an organism holds in a food chain or web 1. Primary producer 2. Primary Consumer 3. Secondary consumer 4. Tertiary Consumer 5. Quaternary Consumer Trophic Levels:
22 1 Osprey 10 Northern Pike 100 Perch 1,000 Bleak Fish 10,000 kcal of plants
23 Your Turn! Use the notes to help you answer all the questions about the relationships in food webs, food chains and food pyramids. If you don t finish it s HOMEWORK!!!
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