Monday, January 24, 2011

Food Webs & Food Chain Implications

We will be extending our knowledge about food webs with a short senteo quiz today.  On Friday, we learned about how food webs are set up using pictures and arrows.  The main purpose of the food chain is to show the exchange of energy in an ecosystem.  The arrow points from one picture to a picture of the object that received the energy.  For example, a plant receives energy from the sun, so the arrow would go from the sun to the plant.
Food chains are more linear form of showing energy exchange in an ecosystem.  They are great for showing predator/prey relationships, but then what happens if the line of energy is interrupted? Today in our lesson, we are going to explore and discuss this idea with the activity called bears in the forest.  From this we will also better understand energy flow in an ecosystem and the idea of limiting factor, which is any factor that limits the growth of a population in an ecosystem
Lastly, I want all of the students to keep thinking about what animal they would like to focus on for their animal study.  By Wednesday, hopefully all students have made their selection of an animal that lives on land at least 70% of the time.  And remember the more obscure the animal is that you choose the more difficult the journey will be for you.

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