Aquatic Ecosystems Review

In lakes, what area near the shore features rooted plants and abundant life?

• benthic zone
• open water
• littoral zone
• continental shelf

Sharks, dolphins, turtles, and other free swimmers are called...

• plankton
• nekton
• benthos
• rethos

In an estuary, animals are adapted to changes in...

• water depth
• temperature
• salinity
• all of the above

Estuaries are very productive ecosystems because they receive fresh nutrients from

• lakes and ponds.

• rivers and oceans.

• marshes and swamps.

• streams and springs.

The types of organisms found in a pond or lake depend on

• the amount of sunlight available.

• the temperature of the water.

• the presence of nutrients.

• All of these factors affect aquatic organisms

What are areas where freshwater meets saltwater called?

• wetlands
• estuaries
• coastal byways
• intertidal zones

Bottom dwelling organisms.

• Plankton
• Fish
• Mammals
• Benthos

Photosynthetic organisms are found mainly in shallow water due to the availability of

• oxygen

• nutrients

• sunlight

• salt

What are the role of phytoplankton in an aquatic ecosystem?

• producers

• primary consumers

• secondary consumers

• tertiary consumers

Organisms in estuaries must be able to survive

• frequent dry conditions
• high winds
• changing salt levels