They found that recent decreases in critical lake nutrients, partly due to increases in invasive species such as quagga mussels, reduce the amount of Chinook salmon that the lake can support. (sciencedaily.com)
A young girl sits on a mound of quagga shells at Sleeping Bear Dunes National Lakeshore in Michigan. (discovermagazine.com)
Initially, this was a post of mine on Olivia Judson's article about Quaggas and extinction, but I find it appropriate here as well... (dotearth.blogs.nytimes.com)