Exam 24: Aquatic Ecosystems

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

In hydrothermal vent communities, autotrophic organisms obtain energy by oxidizing

In lakes and ponds, the primary place of decomposition occurs in the ________ zone.

Using Lake Winnipeg as an example, outline the factors that cause, and the results of, eutrophication.

Describe three different types of reefs and how they are formed.

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

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

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

Streams generally have a ________ temperature at their headwaters than toward their outlet.

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

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

In streams and rivers, decomposition occurs primarily in

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

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

In the benthic zone of lakes and ponds, organisms that are attached to or move on a submerged substrate, but do not penetrate it, are referred to as ________, or aufwuchs.

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

In lakes and ponds, decomposition occurs primarily in the

Still 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.