Freshwater Aquatic Ecosystems

Choose ALL factors that affect aquatic biodiversity.

• salinity

• water temperature

• availability of light

• availability of nutrients

Which characteristic applies near the mouth of a river? Choose ALL that apply.

• high sedimets

• low sediments

• high oxygen

• low oxygen

freshwater ecosystem

• temperature

• coral reef

• pond

• benthos

• nekton

_____________ are wetlands that are dominated by woody plants, such as trees.

• marshes 
• swamps  
• estuaries

Lakes that are very low in nutrients, limiting plankton populations and leaving the water very clear.

• oligotrophic

• eutrophic

• Great

• Turbid

A mix of freshwater and saltwater is called:

• wetland

• mangal

• brackish

• osmoconformer

____________________are wetlands that contain non-woody plants.

• marshes  
• swamps 
• estuaries

Which biome is pictured below?

• mangrove

• coral reef

• ocean

• freshwater

In which aquatic zone would you be likely to find cattails and reeds? This is a picture of cattails and reed.

• littoral

• eutrophic

• benthic

• none of the above

What causes "dead zones"?

• excess nutrients increase algae

• increased oxygen

• absence of light

• decrease in temperature