Bell Ringer Answer the following questions 1 Why

Bell Ringer Answer the following questions: 1. Why is it important for societies to live within carrying capacity? 2. What are some of the limiting factors to population growth? 3. What would a graph of a population at carrying capacity look like?

Energy Flow in Ecosystems

What are we learning today? Benchmark Objectives SC. 912. L. 17. 9 – Use a food ü Describe the structure of a food chain. web to identify and ü Explain how food chains and distinguish producers, food webs are related. consumers, and decomposers. Explain the ü Describe the energy pathways through the pathway of energy transfer different trophic levels of a through trophic levels and food web or energy pyramid. the reduction of available energy at successive trophic levels. AA

Agenda • Bell Ringer (10 min. ) • I Do (15 min. ) – PPT Lecture • We Do (30 min. ) – Trophic Level Activity • You Do (15 min. ) – Independent Practice • Exit Slip (10 min. ) • Closure (10 min. )

What is a food chain? Tertiary Consumer – Carnivores which eat other carnivores. Secondary Consumer – Carnivores that eat herbivores. Energy Flow 2 nd Consumer Primary Consumer – Herbivores 1 st Consumer that eat plants. Energy Flow The order that animals feed on other plants and animals is called a food chain. Energy Flow 3 rd Consumer Producer – Plants, algae, or bacteria that produce their own food by photosynthesis.

What are trophic levels? q Position that an organism occupies in a food chain 4 3 2 1

Trophic Level 4 Energy Flow Trophic Level 2 Energy Flow Can You Guess The Order of the Trophic levels? Trophic Level 3 Trophic Level 1

What is a food web? Omnivore - Eats both plant and animal matter q Detritivore - Obtains its nutrients from decaying organic matter. q

Show Your Understanding q Your job is to build a food web. q Click the picture q Move each arrow from the predator and put it directly on its prey. q Make sure the arrow overlaps the food image, and if you are right; the arrow will lock into place. q You can move the pictures around at any time to make sure the food web is easier to read. q When you have connected all the arrows, you have created a food web. Click me!!!

Energy Flow Through Ecosystems Energy Flow • Energy cannot be created or destroyed. Heat Loss s Los t a e H

The Water Cycle

The Carbon Cycle

Energy Flow in an Ecosystem The flow of energy through an ecosystem starts with the plants and ends as heat loss

Ecological Pyramids 90 % E n sfe an y tr erg s en los 0. 1% Tertiary Consumers % at 10 He 1% Secondary Consumers e r g 10 % Lo Hea ss t d rre 90 % y D e rgy e en red fer ns tra c r e % 10 90 % H Lo eat ss 10% Primary Consumers (herbivores) yt erg en s e s rre sfe ran 100% Primary Producers a d Parasites and decomposers feed at each level Pyramid of Energy Shows the relative amount of energy available at each trophic level Pyramid of Biomass Represent the amount of living organic matter at each trophic level. Pyramid of Numbers Shows the relative number of individual organisms at each trophic level.

In Review: Interdependence… Where Abiotic Meets Biotic!

We-Do You will each receive a role within the food chain! Sun Diatom Copepod Herring Salmon Killer Whale Sun: Gives 11 Energy To Diatoms Diatom: Keep: 6 Pass: 5 Copepod: Keep: 3 Pass: 2 Herring: After the Exercise: You will work on Keep: 1 the analysis questions for 5 min. Pass: 1 And then we will go over the Salmon: questions together as a class for Keep: 0 Pass: 1 another 5 min.

Review Question

Review Question • What distinguishes a food chain from a food web? • Despite warnings about future shortages and the pollutants released, we continue to burn oil and coal for energy. What evidence, if any, suggests attitudes toward conservation are changing? – Are they changing quickly enough?

Review Question • What problem might you encounter if you tried to show energy flow through an ecosystem using a pyramid of numbers? • In your own words explain the first and second laws of thermodynamics.

Home Learning • List the pros and cons of the following types of energy: – Solar – Wind – Hydroelectric – Geothermal