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Food Web Balance

Science, Grade 6

Food Web Balance

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Table Of Contents: Food Web Balance

1. Changes in Population Size

If the population size of a species changes within an ecosystem, the balance of the food web can be disrupted. Over time, all levels of the food web can be affected.

2. Alaskan Marine Ecosystem Example

This food web shows the feeding relationships of organisms in an Alaskan marine ecosystem. If the population of seals and sea lions dramatically decreased, what impact would it have on this food web?

3. Killer Whales Feed on the Otters

Without as many seals and sea lions to eat, killer whales might start feeding on more sea otters, causing a decline in their population.

4. Sea Urchin Overpopulation

With fewer otters as predators, the number of sea urchins would grow and eat more of the kelp forests.

5. Loss of Kelp Habitat

The kelp forests are the habitat for many fish larvae. Loss of this habitat would cause a decline in the fish population.

6. Marine Ecosystem Is Altered

This example demonstrates that the original change in the population of the seals and sea lions could cause a chain reaction of events that would alter the balance of the food web.

Food Web Balance

Science, Grade 6

Food Web Balance

Presentation

Table Of Contents: Food Web Balance

1. Changes in Population Size

2. Alaskan Marine Ecosystem Example

3. Killer Whales Feed on the Otters

4. Sea Urchin Overpopulation

5. Loss of Kelp Habitat

6. Marine Ecosystem Is Altered

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