Owl Pellet Dissection Victims. Copy the following slides onto page 9 of your notebook.

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Presentation transcript:

Owl Pellet Dissection Victims

Copy the following slides onto page 9 of your notebook.

Trophic Levels Energy enters an ecosystem in the form of sunlight. Plants use photosynthesis to convert this abiotic energy into biotic energy. The energy is moved through the food chain when a primary consumer eats the plant.

At each level of the energy pyramid, 10% of the energy is lost. It takes about ten pounds of biomass from one trophic level to produce one pound of each organism at the next trophic level. (ADD TO YOUR GLOSSARY) Biomass-the total amount of organic matter present in a trophic level.

What does this mean? An elephant has to eat 660 pounds of grass a day. A shrew eats 80-90% of its body weight every day. A blue whale has to eat 8000 to pounds of krill a day. A lion eats pounds of food a day.

There are less organisms as you go up the trophic levels.

Barn Owl

Redback Vole

Shrew

White Footed Mouse

House Mouse

Meadow Vole

Mole

Norway Rat