Invasive species like zebra mussels are threatening river ecosystems, biologist says

Matt Terrell
[Vail Daily} Vail, CO Colorado

"....Didymo is one of a handful of bothersome, unwelcome species that could have a profound effect on our ecosystem if we’re not careful, says Brian Healy, a biologist with the U.S. Forest Service....."

http://www.vaildaily.com/article/20080620/NEWS/928144175/1078&ParentProfile=1062