Ecological Pyramids How much energy is passed from one organism to the next?

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Presentation transcript:

Ecological Pyramids How much energy is passed from one organism to the next?

Ecological Pyramids What is an ecological pyramid? It’s a diagram that shows the amount of energy/matter in each trophic level Trophic levels: 1. Producer (autotroph) 2. Consumer (heterotroph: herbivore/omnivore) 1. 1 st level (heterotroph: omnivore/carnivore) 2. 2 nd level (heterotroph: omnivore/carnivore) 3. 3 rd level (heterotroph: carnivore)

Types of Ecological Pyramids Open your book to page Energy pyramid 2. Biomass pyramid 3. Pyramid of numbers

Why is the pyramid smaller at the top? Observations  Only 0.1% of the energy makes it to the top level  1500 grams of grain can only be made into 50 grams of human tissue  Only one hawk is at the top, while there are numerous producers at the bottom Reason  ENERGY IS LOST AS HEAT AT EACH LEVEL

What you need to know  How much energy passes from one trophic level to the next (1 st ecological pyramid)  The relative number of organisms at each trophic level

Classwork  You will work on a worksheet in class.  Read ALL the instructions. Most likely you will find the answer to your question, so you do not need to ask the instructor.  You will each turn in a worksheet.  Work in groups of 2, or 3. (NOT four)  You may talk quietly as long as your conversation is about the assignment.

Discuss classwork

Homework  Read section 3-1 and 3-2.  Do the following problems:  Page 65 #1, 4.  Page 73 #1-5.  Page 83 #14, 18.