Freshwater Ecosystems (6/19/2024)

Breathing Underwater Exploration
In this Exploration you will see pictures with various air temperatures and observe their effects on the water temperature, dissolved oxygen, and fish in a pond. Dissolved Oxygen is the amount of gaseous oxygen(O2) dissolved in the water. Oxygen enters the water by direct absorption from the atmosphere, by rapid movement, or as a waste product of plant photosynthesis.

For each set of pictures below answer the questions about those pictures.  

1

Where is the warmer water located, at the top or at the bottom?

1

Where is most of the dissolved oxygen located, at the top or at the bottom of the water?

1

What observation can you make about the movement of the fish?

1

Why do fish swim slower in colder water?

1

Where is the warmer water located, at the top or at the bottom?

1

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

1

What observation can you make about the movement of the fish?

1

Where is the warmer water located, at the top or at the bottom?

1

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

1

What observation can you make about the movement of the fish?

1

Where is the warmer water located, at the top or at the bottom?

1

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

1

What observation can you make about the movement of the fish?

Answer the questions below about all of the pictures.

1

At which air temperature did the fish swim freely throughout the pond?

1

How did the water temperature affect the swimming speed of the fish?

1

For all air temperatures, was the greatest amount of dissolved oxygen found in cooler or warmer water?

Use the PowerPoint on Freshwater Ecosystems to answer the remaining questions.

1

What is an important abiotic factor for freshwater streams?

1

What is the area of water near the edge of a lake or pond called?

1

What is the wetland area with trees called?

1

Where is the warmer water located, at the top or at the bottom?

Where is most of the dissolved oxygen located, at the top or at the bottom of the water?

What observation can you make about the movement of the fish?

Why do fish swim slower in colder water?

Where is the warmer water located, at the top or at the bottom?

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

What observation can you make about the movement of the fish?

Where is the warmer water located, at the top or at the bottom?

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

What observation can you make about the movement of the fish?

Where is the warmer water located, at the top or at the bottom?

Where is most of the dissolved oxygen located, in the warmer or cooler water at the top or at the bottom?

What observation can you make about the movement of the fish?

At which air temperature did the fish swim freely throughout the pond?

How did the water temperature affect the swimming speed of the fish?

For all air temperatures, was the greatest amount of dissolved oxygen found in cooler or warmer water?

What is an important abiotic factor for freshwater streams?

What is the area of water near the edge of a lake or pond called?

What is the wetland area with trees called?

What is the wetland area called that does not have trees?