Unionid Mussels Associated with the Construction of the Melvin Price Lock and Dam211 on the Upper Mississippi River. Long Term Resource Monitoring Program

摘要

Eighteen species of native unionid mussels (Unionidae) were recovered from211u001esediments dredged from behind a coffer dam built during the construction of the 211u001eMelvin Price Lock and Dam on the Upper Mississippi River. For three species 211u001e(Amblema plicata, Anodonta grandis, and Obliquaria reflexa), shells in the 211u001edredged material were significantly smaller than those of the same species 211u001ecollected at about the same time from other sites in Pool 26 of the Illinois and 211u001eMississippi Rivers. The concentration of juvenile specimens in the dredged 211u001ematerial is though to represent a de novo development associated with silt 211u001eaccumulation behind the coffer dam.