Exam 25: Aquatic Ecosystems

In lakes and ponds,decomposition occurs primarily in the

Organisms living in deep-sea hydrothermal vents do not need light to obtain their energy.

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 ________.

In the ocean,swimming organisms that can move at will in the water column are referred to as

Most estuarine organisms are benthic.

In lakes and ponds,the depth at which respiration balances photosynthesis is referred to as the ________ depth of light.

Semi-enclosed areas of the coastal ocean where seawater is diluted and partially mixed with freshwater coming from the land are referred to as

The organisms living on the bottom of the ocean are collectively referred to as

In lakes and ponds,phytoplankton and zooplankton are most abundant in the

The general term for flowing bodies of freshwater is ________.

The Colorado River in western North America is so overused that it disappears before it reaches the mouth of the Gulf of California.

Streams are classified according to orders.If two first order streams join,flow through a valley,and are joined by another first order stream,what is the final stream order?

Non-flowing water bodies,such as lakes,are referred to as lotic ecosystems.

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

Smaller than diatoms,the ________,which include tiny cyanobaceteria,haptophtyes,and coccolithophores,make up the largest biomass in temperate and tropical water.

In lakes and ponds,the ________ zone is a shallow-water zone along the perimeter in which light reaches the bottom.

________ fish are those that live most of their lives in marine environments and return to freshwater to spawn.

The velocity of water in a stream channel is greater along the margins of the channel than in the center of the channel.

The dominant autotrophs of the open water are

Lakes can be formed from both geological and nongeological activity.