Food Web Interactions

Each organism in the food web has an important part to play in the environment. When something happens to one organism, it may affect everyone else in the food web.

http://www.youtube.com/watch?v=bW7PlTaa wfQ There is a delicate balance…They are all connected in “The great circle of life”

We can show what goes on with the help of a Food Web

What would happen if a disease killed off many of the hawks?

There will be nothing to eat the snakes, so their numbers will increase.

No frogs. More crickets

Most of the cattail gets eaten by the crickets

Now the crickets don’t have enough food so their numbers go down

..and so on. Numbers of each species have an effect on the numbers of the other species in the web.

Predict what might happen in the following situations: A) There is very little rain and much of the Marsh Grass and Cattail die off.

. B) Humans nearby bring cats into the area

C) The frogs eats some poisoned slugs from a garden

A disease kills all the birds in the area A disease kills all the birds in the area. What organisms would be affected?

If over hunting drastically decreased the crab population in an area, what would happen to the other organisms?