Hove, M.C., C.E. Freiburger, and R.A. Engelking. 1995. Qualitative bivalve survey of the Sandy River Drainage, Minnesota. Final report submitted to the Natural Heritage and Nongame Research Program, Minnesota Department of Natural Resources. 17 pp.
Few bivalve surveys have been conducted on tributaries to the Mississippi River upstream of St. Anthony Falls in Minneapolis, Minnesota. A qualitative survey of the Sandy River basin, located primarily in Aitkin County, was conducted during August-September, 1994. The Sandy River drainage, comprised of the West Savanna, Prairie, Tamarack, and Sandy Rivers, was surveyed at thirty-two sites for freshwater bivalves. Pill clams (Spaerium) and nine species of unionids were observed: Actinonaias ligamentina, Anodonta grandis, A. imbecillis, Anodontoides ferussacianus, Lampsilis ovata, L. siliquoidea, Lasmigona compressa, Ligumia recta, and Strophitus undulatus. Numerous populations of Lampsilis siliquoidea, Anodonta grandis, Anodontoides ferussacianus, and Spaerium were observed throughout the drainage. Populations of Lasmigona compressa, Ligumia recta, and Anodonta imbecillis were scattered between tributaries. Very few Lampsilis ovata and Strophitus undulatus were observed; only one dead Actinonaias ligamentina was found. Greatest unionid diversity occurred in the Prairie River, which is located in a state forest. Highest CPUEs were recorded at sites in the West Savanna River, situated primarily in the Savanna Portage State Park. Lowest unionid diversity and CPUEs were observed in channelized reaches of the Sandy River.