Skip Navigation

  Button that takes you to the glossary page. Button that takes you to the related links page. Button that takes you to the references page. Button that takes you to the Problem Based Learning model page. Button that takes you to the modules and activities page. Button that takes you to the teacher pages. Button that takes you back to the main page.Image map of some Water Quality puzzle pieces. Please have someone assist you with this.

Button that takes you to the Physical Methods page.
Button that takes you to the Chemical Methods page.
Image that says Biological Methods.		 Biological Methods
Benthic macroinvertebrates were used as biological water quality indicators in Wheeling Creek. Macroinvertebrates were chosen because they are more abundant and easier to capture than fish and because they are easier to identify than algae or protozoans.

Image showing people in a stream sampling macroinvertebrates. This image links to a more detailed image.Macroinvertebrate samples were collected using a Hess sampler in larger (fifth and sixth-order) streams and a Surber sampler in smaller streams. Left: Sampling macroinvertebrates. Photo: Dr. Ben Stout

Macroinvertebrates were identified and enumerated, and the number of organisms at each site was estimated from the average of three 0.1 m2 (1.1 ft2) samples. In addition to the total number of organisms, several measures of diversity are described below. Summaries at the taxonomic level of order, for instance the mayflies, stoneflies, beetles, and other organisms, are also described below. Right: Checking rocks for bugs. Photo: Dave Saville

Image of two people checking rocks for bugs. This image links to a more detailed image.Benthic macroinvertebrate densities were reported as the total number of organisms per square meter of stream bottom. Additionally, the number of mayflies, stoneflies, caddisflies, beetles, midges, crustaceans, worms, and mollusks was reported. The total number of identifiable kinds of organisms was reported as richness. The Shannon index was used as a diversity index. The EPT index, a measure of the "quality" of the invertebrate community, was calculated as the number of mayflies (Ephemeroptera), stoneflies (Plecoptera), and caddisflies (Trichoptera) divided by the total number of midges.

[ Physical Methods ] [ Chemical Methods ] [ Biological Methods ]
 [ Glossary ] [ Related Links ] [ References ] [ PBL Model ]

[ Home ] [ Teacher Pages ] [ Modules & Activities ]

Button that takes you back to the Water Quality main page.

HTML code by Chris Kreger
Maintained by ETE Team
Last updated November 10, 2004

Some images © 2004 www.clipart.com

Privacy Statement and Copyright © 1997-2004 by Wheeling Jesuit University/NASA-supported Classroom of the Future. All rights reserved.

Center for Educational Technologies, Circuit Board/Apple graphic logo, and COTF Classroom of the Future logo are registered trademarks of Wheeling Jesuit University.