Welcome! Please get your interactive notebook and pick up your owl pellet folder from the lab table. Please read the board!

Owl pellets  What were the most common bones?  What do owls eat? What are their prey?  How many animals were in your pellet?

Sooooo...  A barn owl produces on average two pellets a day.  Prey eaten per day ___________  Prey eaten per week ____________  Prey eaten per month ____________

How much space would this food chain require?  If each rodents needs 5 m 2 to find enough food for itself, how much space would all the rodents in the one pellet need to survive?  How much space would all the rodents for one MONTH need to survive?  Do owls need more or less space than a rodent? WHY???

Which trophic levels need the most space? The least? Why?

**Energy pyramid – A graph showing how much total energy is in related trophic levels. carnivore herbivore Primary producer

Prairie Ecosystem Hawks Snakes Mice Grasses

How do living organisms transform or use energy?  Movement  Metabolism… transforming chemicals like food into energy like ATP  Heat… a by-product of metabolism  Growth and Development  Reproduction

Energy is converted between trophic levels.  Energy is always converted as it moves from one trophic level to the next. Most of the energy is converted into a form that can’t be used again.  How would one organism use up it’s energy?  Energy is converted into motion, heat, growth, and metabolism.

Why isn’t the energy pyramid shaped like a rectangle?  As energy moves from one trophic level to the next, some energy is “lost”.  Where does the energy go?  It is transformed through use and consumption

**Law of Conservation of Energy:  **Energy is neither created nor destroyed; it is transformed from one type to another  Example: sun  plant  apple  ATP (fuel of cells)  you writing these notes

How do living organisms transform or use energy?  Movement  Metabolism… transforming chemicals like food into energy like ATP  Heat… a by-product of metabolism  Growth and Development  Reproduction

**The Rule of 10% Of all energy taken in by a trophic level, most of it is used in growth, motion, metabolism or body heat. Only 10% of the energy is available to the next trophic level.

Energy pyramids have as many levels as links in a food chain!

Reflection on left side:  An owl needs much more habitat than a mouse because...  When a carnivore eats an herbivore most of the energy...