Exam 25: Aquatic Ecosystems

Many physical features dictate life in an estuary.The physical feature with the most influence on organismal distribution is

In lakes and ponds,oxygen concentrations are lowest in the

If a stream has an average depth of 3 meters,an average width of 4 meters,and an average stream velocity of 0.25 m/s,what is the discharge rate or streamflow (Q)?

Because the thermocline is permanent in tropical oceans,little vertical mixing occurs,resulting in low productivity.

In rivers and streams,the invertebrates that scrape algae off rocks are referred to as shredders.

In lakes and ponds,the open-water zone extending to the depth of light penetration is referred to as the ________ zone.

In the profundal zone of a lake or pond,the rate of photosynthesis exceeds the rate of respiration.

The organisms responsible for the majority of primary production in marine environments are the copepods.

The deepest water of an ocean in deep-sea trenches and canyons is referred to as the hadalpelagic zone.