Ecology – Part 2 – General Biology Food Chains Food Webs Ecological Pyramids Ecological Cycles

Food Chain Video Clip http://www.youtube.com/watch?feature=fvwp&NR=1&v=cWh-XKhh8xo

Energy Flow Relationships Food chains transfer of energy in repeated stages Trophic Level Feeding level (producers, primary consumers, secondary consumers, etc.) of the food chain Click on this box to play the game! Click on the box to learn more about food chains!

Food Chain

Food Web Food chains interconnected Note that the arrows go in the direction of energy flow!!

Food Web

Food Web

Buzzard Gulch Activity

When I say trophic level, what are some words that should come to mind? Which trophic level should always be on the bottom of ANY ecological pyramid?

Ecology Smart Board Activity Pages 1,2, 3, and 4

Energy in Ecosystems video clip http://www.sascurriculumpathways.com/ProductEntrance/Launch/launch.jsp?unit=1278 Quick launch 1278 The username is hickoryridge (no spaces) You do not have to enter a password.

Ecological Pyramids –graphic representations Pyramid of Energy shows how energy flows from producers to carnivores The energy that is obtained is only 10% of the previous level’s energy.

Energy Pyramid - 10% Rule Scientists estimate That only 1 % of the sun’s energy is used in photosynthesis!!

Figure 54.14 Food energy available to the human population at different trophic levels

Another Food Chain Video http://www.youtube.com/watch?v=TE6wqG4nb3M

PBL Task #2 Construct a Food Chain AND a Food Web that has your chosen organism.  Please make sure you label the different trophic levels of the Food Chain AND Food Web.   Please also include a FOOD WEB web in your computer document. High-light the Food Chain in the Food Web! Take notes on Cycles of Materials if you haven’t already Start over at the beginning of the Ecology – Part 2 powerpoint and make sure you have gone over everything in your group….. REVIEW these topics!!! Have you answered the Schoology practice questions from the 1st powerpoint – you MAY want to do that! Answer the Schoology practice questions for Ecology Part 2 – Energy Flow Relationships Please begin the Ecology – Part 3 notes on Carrying Capacity

What’s the Deal with Carbon Video

Cycles of Materials Which are the most abundant elements found in organisms? Carbon Hydrogen Oxygen Nitrogen Phosphorus

What’s the Deal with Carbon Video http://www.youtube.com/watch?v=2Jp1D1dzxj8

Carbon Cycle Driven by cellular respiration, photosynthesis, Decomposition and combustion Open burning Atmospheric CO2 Photosynthesis Respiration Fuel Combustion Respiration Fuel Combustion Photosynthesis Dissolved CO2 Respiration Death and decay Death and decay Fossil fuels

Carbon Cycle Game

Nitrogen Cycle Plants and animals can’t use atmospheric nitrogen – it has to be converted! Nitrogen-Fixing Bacteria drive the nitrogen cycle Nitrogen  nitrates They live in the root nodules of legumes (bean plants)

Carbon Cycle Graphic Organizer Let’s do this together! Did you also do the Carbon Cycle Questions on the same page?

Please do the Nitrogen and Carbon Cycle Worksheet! Get from Mrs. Cruce if you have not received one yet!

Carbon Cycle Worksheet 1. What is the process by which plants convert carbon dioxide into energy-rich carbon compounds? 2. Explain what can happen over millions of years to the carbon compounds in organisms that die and decompose. 3. What processes in the transparency release carbon dioxide into the atmosphere? 4. Identify the two major reservoirs of carbon dioxide on Earth. 5. What are the forms in which carbon is found in the oceans? 6. How do plants and animals help to maintain a balance of carbon dioxide in the atmosphere? 7. Atmospheric carbon dioxide produces a so-called “greenhouse effect” by trapping heat near Earth’s surface. What human activities might tend to increase the greenhouse effect?

Nitrogen Cycle Worksheet 1. What percent of the air consists of nitrogen gas? 2. Bacteria in root nodules change nitrogen gas into what form? 3. What is the role of decomposers in the nitrogen cycle? 4. How do plants obtain the nitrogen they need? 5. How do herbivores obtain the nitrogen they need? 6. How do other animals obtain the nitrogen they need? 7. According to the transparency, how is nitrogen returned to the atmosphere? 8. What would be the impact on the nitrogen cycle if there were a decrease in decomposition in a given ecosystem?

Voc Review – Please work with your neighbor!

Enrichment If you need more to do, please see the next slides.

Foldable We are going to construct a foldable showing a food chain, energy pyramid, and trophic levels!! Please grab a sheet of scrap paper. Fold a sheet of paper in half diagonally. Cut the excess off. Fold it into a triangle and then unfold. Cut 1 of the lines of the triangle. (Just to the center)

Construct your foldable like this: 3 sides to the Pyramid Each side should have 4 trophic levels in the correct order: draw lines to show 4 levels and then do this for each side: 1 side: Energy pyramid Show energy relationships from most energy to least energy (numbers should be used) 1 side: Trophic levels Include these words: primary consumer, autotroph, secondary consumer, heterotroph, producer, carnivore, herbivore, 3rd level consumer 1 side: Food chain Please draw and label what your organisms are! Show at least 4 trophic levels!