nwnature.net | Freshwater Macros Index | nwnature's Macros Field Guide | Macroinvertebrate Resources |
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Macroinvertebrate Resources | Know Your Macros (downloadable PowerPoint slideshow) |
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Macroinvertebrate Taxa Non-insects: Hydra | Flatworms | Segmented Worms | Mollusks | Water Mites | Crustaceans |
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Most recent additions: October 2015 (note: these images may not show in the links listed below) |
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Instructions: For a larger view of the specimens below, click on an image. A new window will appear with an enlarged picture of the organism. Close the window when you are through looking at the image. For more information and additional pictures of the macros (or similar organisms), click on the links next to the images. Information on size, location, and date of collection for many of the organisms can be found on these supplemental pages.* |
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* Some of the supplemental pages provide pollution tolerance levels for organisms used in biomonitoring. The tolerance levels are generally described as: tolerant of pollution; moderate (somewhat sensitive), or sensitive (intolerant of pollution). While tolerance levels can actually vary by species, and different species can have varying tolerances to specific pollutants, the levels given are generalized for the family of organism. (Flathead mayflies, for example, are considered to have a moderate tolerance to pollution. Some species of flathead mayflies, however, are sensitive, while others are tolerant.) In describing the tolerance levels for the various macros, I relied on information presented in Macroinvertebrates of the Pacific Northwest, A Field Guide by Jeff Adams and Mace Vaughan, and A Guide to Common Freshwater Invertebrates of North America by J. Reese Voshell, Jr. While considerable effort has been made to be as accurate as possilbe, I recommend anyone using information found on this site to confirm the data by going to the sources mentioned above, or other qualified resouce materials. Further information on the identification and ecology of aquatic macroinvertebrates can be found from the materials mentioned on the Resources Page. If you have any comments or notice any errors, please contact: . I want this site to be a useful and accurate resource for educators, volunteer water quality monitors, and watershed enthusiasts. The author would like to acknowledge the following contributors to and supporters of this project:
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