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| Biology Department
St. Croix River - mussels, map, pictures Winged mapleleaf - Quadrula fragosa |
Mussels of the St. Croix River
A summary of the distribution of mussels in the St. Croix based on quantitative sampling completed by the Macalester team can be found here. A map of the St. Croix River that provides interactive access to more of the data on mussels in the river can be found by clicking here.
There are two federally endangered species of mussels - the Higginsi Pearly Mussel (Lampsilis higginsii) and the winged mapleleaf (Quadrula fragosa). In addition there are a number of species listed as endangered or threatened in the states of Minnesota and Wisconsin. Click here for a list of species and their conservation status There have been a number of qualitative and quantitative studies of the mussel assemblages of the St. Croix River. Much of the information has been summarize in: Hornbach, D.J. 2001. Macrohabitat factors influencing the distribution and abundance of naiads in the St. Croix River, MN and WI, USA, pp. 213-230. In G. Bauer and W. Wächtler [eds] Ecology and Evolutionary Biology of the Freshwater Mussels Unionoidea. Ecological Studies Vol. 145 Springer Verlag: Berlin. In this paper Hornbach has examined the
factors
which may help to explain the distribution of mussel species in the
river. Click here for more information.
In addition Hornbach and researchers at
Macalester College have been conducting quantitative studies of
populations at 7 sites on the St. Croix River. The
methods used can be examined by clicking here. |
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