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

Ecological PyramidsWhat is an ecological pyramid?

It’s a diagram that shows the amount of energy/matter in each trophic levelTrophic levels:1. Producer (autotroph)2. Consumer (heterotroph: herbivore/omnivore)

1. 1st level (heterotroph: omnivore/carnivore)2. 2nd level (heterotroph: omnivore/carnivore)3. 3rd level (heterotroph: carnivore)

Types of Ecological PyramidsOpen your book to page 721. Energy pyramid2. Biomass pyramid3. 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 bottomReason ENERGY IS LOST AS HEAT AT EACH LEVEL

What you need to know How much energy passes from one

trophic level to the next (1st 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.