Introduction | Catalog of Aquatic Macros | Macro Images by Location | Macroinvertebrate Resources
East Fork Lewis River Watershed | CAM Jr. Science | CAM | Battle Ground School District
The images on this page are of an alderfly and riffle beetle collected by watershed steward volunteer, Judy Bufford, from Lacamas Creek in eastern Clark County. Judy also helps the Environmental Information Cooperative conduct water quality testing with school groups, including CAM. Thanks, Judy, for sharing your time and expertise with students, and for contributing the macros below for us to examine and photograph. The dialog below comes from an email correspondence between Michael Clapp (MC) , CAM Jr. High science teacher, and Jeff Adams (JA), Director of Aquatic Programs for The Xerces Society and author of the CD-ROM, The Stream Bugs as Biomonitors: Guide to Pacific Northwest Macroinvertebrate Monitoring and Identification. Jeff has encouraged our efforts to collect, photograph, and identify aquatic macroinvertebrates as part of our water quality testing activities. We're grateful that Jeff is willing to share his expertise with us, and for his permission to publish that information on this webpage. Instructions: For a larger view of the specimens below, click on an image. The enlarged image will appear on your screen in a new window. Close this new window when you are through viewing it. Further information on the identification and ecology of aquatic macroinvertebrates can be found from the materials mentioned on our Resources page. |
| MC: This was the first alderfly I've seen, though others have told me it's not uncommon to find them -- in the right locations. It was a relatively compliant specimen to photograph, and it's size allowed me to zoom & focus on the head and tail for more detail. I was impressed by its large set of "chompers."
JA: Great pics. Far better than the shrivelled dead one I photographed for the CD-ROM. This would be a truly frightening beast to encounter if you were a midge or a 5mm long mayfly. Like you, I haven't seen a lot of them in streams, but you've heard correctly that they can be quite common. I've found the greatest abundances in slack waters and wetlands. |
MC: The beetle ... appears similar to others I've collected and photographed. I've been trying to figure out what genus, but I don't seem to have enough detail. It's body is triangular in cross-section. The plates on the back appear almost notched along the central ridge -- this could be a matter of angle and coloration. Although the images are a little blurred, it doesn't appear to have spines as described for Ampumixis dispar. The other options appear to be Optioservus, or possibly Heterlimnious? Again, not enought detail or proper positioning to check for the small plates above the legs. Any other suggestions?
JA: You're right on with the three genera you suggested. Ampumixis would have more obious spiny tufts along the top in the side picture. Heterlimnius is a possibility, but would be more likely at higher elevations and in colder streams.... Optioservus is my bet. Keep the beetle images coming though. I think you had the wood-eating Lara at one point, so the last remaining distinctive beeltes would be Ampumixis and Narpus. I expect to see the latter among your images one of these times but haven't yet. |
Once again, we'd like to thank Jeff Adams, Director of Aquatic Programs for The Xerces Society, for taking the time to look at and comment on the macroinertebrate images above. As author of the CD-ROM, The Stream Bugs as Biomonitors: Guide to Pacific Northwest Macroinvertebrate Monitoring and Identification, he has considerable knowledge in identifying aquatic macroinvertebrates and experience in using "stream bugs" as bio-indicators of water quality. If you'd like to hear more from Jeff about macroinvertebrates, check out a scaled down Internet version of The Stream Bugs as Biomonitors... CD-ROM at The Xerces Society website. Better yet, order a copy for yourself. (PC compatible only; many images won't show on a Macintosh) Additional image sets with comments from Jeff Adams: East Fork Lewis River at Lewisville Park - Spring 2005 | Upper East Fork Lewis River - Fall 2005 | Salmon Creek - Dec. 2005 | Lacamas Creek - Nov. 2005 |
For information, questions, or comments, email
Michael Clapp: clapp.michael@bgsd.k12.wa.us
Webpage created by M. Clapp
Modified: 2/10/06