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 m2 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.

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.

**Law of Conservation of Energy:

**Energy is neither created nor destroyed; it is transformed from one type to another

Example: sunplantappleATP (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 . . .