#3 - Freshwater Ecosystem - Rio Negro

Rio Negro

Freshwater Ecosystem

Multiple Choice

The pink river dolphin is a predator. What structural adaptation of the pink river dolphin shows what niche it has in the ecosystem?

• Teeth for grabbing prey

• Light skin that the prey can see

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Where is the Rio Negro?

• The Rio Negro is a freshwater river found in South America.

• Rio Negro means Black River. The dark color comes from humic acid, which is created when some plants that grow in sandy clearings don't break down fully.

• Remember, freshwater ecosystems DO NOT have salt.

Multiple Choice

What is NOT found in freshwater ecosystems in high levels like it is found in marine ecosystems?

• Oxygen

• pH

• Salt

Multiple Choice

Which of the following are the abiotic factors of a freshwater ecosystem?

• flow of water, light, amount of light, temperature, and chemistry of the water

• salt, dissolved oxygen, temperature, and amount of light

• plants, animals, microbes

On your trip, you observe a couple of different organisms in the Rio Negro community.

Multiple Choice

Organism #1: The Neon Cardinal Tetra

You may have seen these in pet stores or aquariums!

These fish swim in groups called "schools." What type of interaction is this?

• Competition

• Cooperation

• Symbiosis

Organism #2: Pink River Dolphin

What BEHAVIORAL and STRUCTURAL adaptations do pink river dolphins have? On the next slide, watch the video to learn how pink rivers dolphins are adapted to their environment.

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Open Ended

What kind of behaviors does the pink river dolphin help it to obtain resources, such as food?

Use evidence from the video.

Use scientific reasoning to explain why this behavior is used in this environment.

Use full sentences.

Open Ended

What kind of physical structures (body parts) are adaptations that help the river dolphin to obtain resources, such as food?

Use evidence from the video.

Explain how these structural adaptations help the river dolphin get its food.

Use full sentences.

Multiple Choice

What is the niche (job) of the pink river dolphin?

• pollinator

• predator

• prey

• decomposer