What are the different types of biomes?

Question

How is the ecosystem maintained in each one?

Answer 1

You can find some good general information about biomes at these sites:

http://www.ucmp.berkeley.edu/exhibits/biomes/index.php
http://www.mbgnet.net/
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/B/Biomes.html

As far as maintaining the ecosystem in each one:
1. the relationships among the living things keep in balance by natural cycles of predators and prey, as well as other limiting factors like competition
2. the physical environment must be relatively stable in order to keep the same populations living there

Answer 2

Freshwater, marine, desert, forest, grassland, tundra, all can be better maintained by "tighter regulation."