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St.
Croix River Mussel Data
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Croix River - mussels, map, pictures
Winged
mapleleaf - Quadrula fragosa
Laboratory
photos and directions to laboratory
Bivalve
gill anatomy
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Disclaimer
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Welcome
to the
Dan Hornbach Research Laboratory Home Page
| This Web Page
belongs to Dr. Daniel J.
Hornbach,
Professor of Biology at Macalester College. It was primarily started in
an attempt to facilitate information search and retrieval for
individuals
within the Macalester College Department of Biology. |
| The "Mussel Movie" - Made for the Admissions Dept. @ Mac
|
|
NEW!
Collaborative Project with The Saint Croix National Scenic Riverway
National Park
Project Title:
Modeling
Sediment Dynamics in the St. Croix River and the Impact on Federally
Endangered Mussels [2008-2010] - Dan
Hornbach, Kelly MacGregor, Mark Hove
Description
Recent
studies have shown that juvenile mussel density is decreasing in native
mussel communities that harbor Federally-listed mussel species. These
declines have been accompanied by increased sediment deposition at
these locations. One location is listed as an Essential Habitat Area in
the Higgins Eye Recovery Plan. Other monitoring sites on the river have
not experienced the decline in juvenile mussels or the increase in
sediment deposition. Those sites which have seen declines are found in
a 10-mile stretch of river downstream of a hydroelectric dam at St.
Croix Falls, Wisconsin. This project will help resource managers
understand the forces which may be leading to the changes in
sedimentation rates. A model of the relationship between discharge and
sediment transport will be developed, suspended sediment transport will
be monitored, and sediment cores from the reservoir above the dam will
be examined, as will the forces of shear-stress above and below the
dam. |
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