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BIOLOGY 21 Sep 2015 Entry Task Identify each color as either a Primary Producer or one of the 6 Consumers. Primary Producer Carnivore Herbivore Omnivore Detritivore Decomposers Scavengers Agenda • • • • Entry Task Housekeeping The Biosphere (Chapter 3) Energy Flow in Ecosystems (Chapter 3.3) • Learning Objectives • Exit Task Housekeeping • Substitute tomorrow Tuesday, 22 Sep. - POGIL Worksheet (Ecological Pyramids) • Quiz #1 Wednesday, 23 Sep. (chapter 3.1 - 3.3) • Some still need to turn in their CER (12 pnts). • Be sure you are bringing your science notebook daily. Exit Tickets • Biotic vs. Abiotic? - Biotic is living organisms, abiotic is non-living objects. - Both interact with one another regularly. • Primary sources of energy? - Photosynthesis (light) & Chemosynthesis (chemicals) Ch 3 Essential Question How do living and nonliving parts of the Earth interact and affect the survival of organisms? Learning Objectives LO 3.3.1 Trace the flow of energy through living systems. LO 3.3.2 Identify the three types of ecological pyramids. Food Chains How does energy flow through ecosystems? • Energy flows through an ecosystem in a one-way stream, from primary producer to various consumers. What is a food chain? • A series of steps in which organisms transfer energy by eating or being eaten. • Food chain on page 73, figure 3-7. p. 73 Food Web What is a food web? • A network of complex interactions formed by the feeding relationships among various organisms in an ecosystem. • Consists of multiple food chains linked together. • Food web page 75, figure 3-9. p. 74-76 Food Web Why is a food web a more accurate representation of the feeding relationships in an ecosystem than a food chain? • Organisms are rarely food or feed on just one other organisms. • Food chains are simple, but feeding interactions are rather complex • Many different feeding relationships exists between organisms in an ecosystem. • Food web page 76, figure 3-10. p. 74-76 Ecological Pyramids Each step in a food chain/web is called a trophic level. Trophic levels are represented by ecological pyramids. There are 3 types of ecological pyramids: • Pyramid of energy • Pyramid of biomass • Pyramid of numbers p. 77-78 Pyramid of Energy Pyramids of energy show the relative amount of energy available at each trophic level of a food chain/web. • Only 10% of the available energy makes it to the next trophic level. p. 77 Pyramid of Biomass Pyramid of biomass illustrate the relative amount of living organic matter available at each trophic level in an ecosystem. Pyramid of numbers shows the relative number of individuals at each trophic levels in an ecosystem • Both are determined in part by the amount of energy available. p. 78 Check on Learning Food Chain? Food Web? Ecological Pyramids? • Pyramid of Energy • Pyramid of Biomass • Pyramid of Numbers p. 69-71