If the trend isn't reversed, more than a few will almost certainly disappear from the state or vanish into extinction. Highly tolerant species, such as the Asian clam, are thriving. Others that make up much of the state's native aquatic fauna are increasingly threatened. Today, approximately 28 of Missouri's 65 mussel species are rare or declining and vulnerable to disappearing from the state. To survey mussels populations, Sue Bruenderman and Scott Faiman spend plenty of time submerged in the Gasconade River.
Mussels are an important link in the food chain along the stream.
Muskrats, otters and raccoons feed on them, as do some fish species. Mussels also filter water through their gills, storing sediment and contaminants in their bodies and shells. They can be thought of as nature's vacuum cleaners. They also are an important indicator of habitat and water quality. Water quality affects not only stream life but also public and private water supplies statewide.