Part A: Ecosystem Selection and Description

Begin by selecting a freshwater or marine aquatic ecosystem as a model for your food web. Be specific. Choose a particular lake or an ocean ecosystem, identifying its geographical area and depth. Keep in mind that deep-sea organisms live in a completely different environment than surface aquatic organisms.

Next, conduct research on the following conditions in the ecosystem you chose, as they influence the types of organisms that can live there:
- Geographical features
- Temperature
- Depth/light availability
- Salinity
- pH
- Unique features that contribute to the ecosystem, such as other bodies of water that connect to it, unusual chemistry, and climate

Using the information you gathered, write a paragraph describing the conditions in the ecosystem.

Part B: Organism Research

Now conduct research on the types of organisms that live in the ecosystem you chose. Note that quaternary consumers and even tertiary consumers can include land animals that rely on the animals in the aquatic ecosystem for food. Collect information based on these guidelines:
- Producers: Identify 2-3 species.
- Primary (or first-level) consumers: Identify 2-3 species.
- Secondary (or second-level) consumers: Identify 2-3 species.
- Tertiary (or third-level) consumers: Identify 2-3 species.
- Quaternary (or fourth-level) consumers: Identify 1-2 species.

Write down the species you identified for each consumer level in the ecosystem.

Part C: Food Web Creation

Using the organisms you identified in Part B, create a food web for the ecosystem you chose. Use this sample food web for reference, although your food web will contain fewer organisms. Note that your food web does not have to include images, but you may include them if you choose. However, be sure to include arrows to indicate the direction of energy flow in your food web. Design your food web using any method listed below:
- Use drawing or flowchart-building tools in a word-processing program.
- Hand draw your food web, and then take a picture of it.
- Use a graphic-design program.

Using the Insert Image button, insert an image of your food web in the answer space.

Part D: Natural Changes

Changes in ecosystems can be attributed to natural causes, such as natural disasters, seasonal variations in climate, currents, and tidal activity. Many of these changes can affect the amount of food resources available in an ecosystem. Research one natural change that currently affects or could affect the aquatic ecosystem you chose. Use your food web model to explain how this change can affect the competition for food resources in your aquatic ecosystem.

Part E: Human Impact

In addition to natural factors, human activity can also alter ecosystems. Conduct research on a human activity that currently affects or can theoretically affect your chosen ecosystem. Use your food web model to explain how this change can affect the competition for food resources.