Exam 25: Aquatic Ecosystems

The zone in the ocean from the surface to approximately 200 meters deep is called the ________ zone.

In streams and rivers,decomposition occurs primarily in

Invertebrates that feed on coarse particulate organic matter (CPOM),such as leaves that fall into streams and rivers,are referred to as

Shredders,collectors,and small predatory fish such as sculpins,darters,and trout are the dominant organisms collectively found in

When rivers flow into the ocean,they create a zone that mixes freshwater with saltwater referred to as a(n)________.

As a stream or river descends,it generally grows

Oxygen concentrations are relatively high in the bottom ooze of lakes and ponds.

Inflowing river waters most often impoverish rather than fertilize estuaries.

Classification of aquatic ecosystems is largely based on features of the ________ environment.

Unlike phytoplankton,which are at the mercy of currents,zooplankton can move at will within a current.

In hydrothermal vent communities,autotrophic organisms obtain energy by oxidizing

Many zooplankton migrate to the surface to graze on phytoplankton during the day and retreat to deeper water during the night.

In lakes and ponds,photosynthesis occurs primarily in the

Phytoplankton thrive in the limnetic zone of lakes and ponds.

The tiny,photosynthetic,primary producers of open water such as desmids,diatoms,and filamentous algae are referred to as ________.

The water above the continental shelf belongs to the ________ province of the pelagic zone.

Reef-building corals have a symbiotic relationship with algal cells called ________ that live within the cells of corals.

Photosynthesis in the ocean takes place mostly in the mesopelagic zone.

Coral reefs grow best where water is

Invertebrates that feed on the algal coating of stones and rubble in streams and rivers are referred to as ________.