Biomes - Research Article from Macmillan Science Library: Animal Sciences

This encyclopedia article consists of approximately 11 pages of information about Biomes.
This section contains 3,184 words
(approx. 11 pages at 300 words per page)
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Aquatic Ecosystems

Freshwater Regions.

Water is classified as fresh if it contains less than 1 percent salt (sodium and potassium chloride and other salts) in solution. Most freshwater plants and animals are unable to tolerate higher concentrations of salt in the water.

Ponds may be only a few square meters, whereas the largest lakes cover thousands of square kilometers. Ponds and lakes are scattered all over Earth. Many important ponds are seasonal and last for only one or two months at a time. These seasonal ponds may still be important resting places for migrating birds and other animals. Some large lakes have lasted for tens of thousands of years.

Lakes and larger ponds can be divided into three different "zones," determined by depth and distance from the shore. The littoral zone is the top layer of water near the shore. It may be warmer than the average temperature of the...

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This section contains 3,184 words
(approx. 11 pages at 300 words per page)
Buy the Biomes Encyclopedia Article
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Macmillan Science Library: Animal Sciences
Biomes from Macmillan Science Library: Animal Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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