Exam 25: Aquatic Ecosystems

The benthic community of an ocean,with the exception of hydrothermal vents,is best described as

As a stream flows down its course,it generally becomes warmer and slower.

Eutrophic lakes are typically clear,with little algal growth.

Flowing-water ecosystems often alternate two different but related habitats: the turbulent ________ and the quiet pool.

Coral reefs occur in nutrient-poor areas of the ocean.

Swimming organisms in the ocean that are able to move at will in the water column are referred to as nekton.

Bioluminescence reaches its greatest development in the mesopelagic zone of an ocean.

Which of the following bodies of water best represents a lotic ecosystem?

A(n)________ is a ring of coral reefs and islands surrounding a lagoon that is formed when a volcanic mountain subsides beneath the surface.

________ are mountainous lakes that have been carved by glacial erosion and deposition.

Because of the high pressure and cold temperatures,few species of organisms survive in the deep benthic zone of the ocean.

The oxygen-minimum layer of an ocean occurs in the

Lakes that receive large amounts of organic matter from surrounding land,particularly in the form of humic materials that stain the water brown,are called ________ lakes.

Which of the following lakes is likely to be the most oligotrophic?

In ponds and lakes,the zone beneath the depth of effective light penetration but above the bottom is referred to as the

The productivity of oceans is greatest in the

The cells of reef-building corals are inhabited by symbiotic species of

Barrier reefs are separated from land by shallow lagoons.

Non-flowing water ecosystems,such as ponds and lakes,are also called ________ ecosystems.

A relatively ________ lake is characterized by an abundance of nutrients,abundant algal growth,and shallow light penetration.