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2. Bellwork A. Describe the similarities and differences between food chains, food webs, and Energy Pyramids.

Homework Reminder: I will check your 3 homeworks from this week tomorrow (Journal Title Page: definition and drawings) . 2. Bellwork A. Describe the similarities and differences between food chains, food webs, and Energy Pyramids. 3. Things to Do Today: Review PPT 1 Distribute Quizzes

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2. Bellwork A. Describe the similarities and differences between food chains, food webs, and Energy Pyramids.

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  1. Homework Reminder: • I will check your 3 homeworks from this week tomorrow (Journal Title Page: definition and drawings) 2. Bellwork A. Describe the similarities and differences between food chains, food webs, and Energy Pyramids. • 3. Things to Do Today: • Review PPT 1 • Distribute Quizzes • Discuss Natural Hazards PPT

  2. Powerpoint 1 Review 1. What are the levels of organization of the environment from smallest to largest? 2.Define a niche. Reference the Warblers! 3. What are the levels called in a food chain?

  3. Trophic Level 4: Tertiary Consumer (Frog) Trophic Level 5: Quarternary Consumer (snake) Trophic Level 3: Secondary Consumer (Dragonfly) Trophic Level 2: Primary Consumer(Bee) Trophic Level 1: Producer (Flower)

  4. Food Webs • Interconnected food chains that show all of the different ways energy flows in the ecosystem

  5. Food Web • Decomposers break down dead organisms into simple nutrient materials that are re-used.

  6. Energy decreases at each level going up the pyramid Energy Pyramid

  7. How do natural disasters alter the biotic and abiotic factors in an ecosystem?

  8. Homework Reminder: • Quiz Tomorrow. I will provide you with a study guide. 2. Bellwork A. How can populations be affected? Think back to our lesson yesterday. • 3. Things to Do Today: • Student: Independent Review • Teacher: Check Homework/J86 • Review Independent Work/PPT

  9. Landslides: large areas of ground movement of rock, earth, or debris that fall, slide, or flow on slopes due to gravity. • Causes: rains, floods, earthquakes, or other natural causes ( can occur in any environment given the right conditions of soil, moisture, and the angle of slope) • Human made causes: excessive development or clear cutting for lumber. • Effects: destroys habitats, roads, homes, & powerlines

  10. WildFires Fire is a natural event in most grasslands and forest ecosystems. Fires can be beneficial to the ecosystem and are an essential component in the life cycle of some trees. CAUSES: Generally fires are neither good or bad. They occur naturally through lighting strikes or when humans start them accidentally or intentionally EFFECTS: (+)intense heat allows some seeds to break open so they can germinate (sequoia), release valuable nutrients in slowly decaying litter and undergrowth increases activity of nitrogen fixing bacteria, helps control pathogens and insects (-)increase in air pollution, habitat destruction, or destroying homes or property

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  12. Floods • A flood is an unusually high water stage in which water overflows its natural or artificial banks onto normally dry land. • Two types of floods: Regular river flood -water slowly climbs over the edges of a river. A flash flood -occurs when a wall of water quickly sweeps over an area • Causes: • Heavy, intense rainfall • Over-saturated soil (ground cannot hold any more water…it is like a sponge) • High river, stream reservoir levels caused by unusually large amounts of rain • Urbanization or lots of buildings or parking lots • Effects: • (+) deposition of sediment and nutrients and creation of fertile soil • (-)Damaging property, Endangering humans and animals, and soil erosion

  13. Births and Deaths How does birth rate and death rate affect a population? Immigration (IN) and Emigration (EXIT) How does this affect a population? More Changes in the Environment Changes in the environment can also occur due to changes in populations. Why would a population change? --new members enter or leave the population--Two ways:

  14. Climate • Climate refers to the temperature and amount of rainfall in a particular environment. • Slight or significant changes can alter and environment thus affecting populations.

  15. Changes in the environment can also occur due to limiting factors. • Limiting Factors: (amount of food, water, space, shelter, and climate) can affect the number of organisms an environment can support. • Organisms require a certain amount of food, water, space and shelter in order to survive and reproduce. • Organisms will compete for these factors and some will not succeed and die. • Carrying Capacity : the max # of organisms a particular ecosystem can withstand

  16. What is happening to this population? • If birthrate increases and death rate decreases, what happens to the population? • If birthrate decreases and death rate increases, what happens to the population? • If birthrate stays the same and the death rate increases, what happens to the population • If 10 organisms immigrate and 10 emigrate, what happens? • If more organisms immigrate than emigrate, what happens?

  17. Think….Why would an environment change? • Natural Disasters • Births and Deaths • Immigration and Emmigration • Climate change • Availability of food water space and shelter LIMITING FACTORS: any biotic or abiotic factor that limits the number of individuals in a population

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