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Round Hickorynut (Obovaria Subrotunda)
- Assessment Summary
- Executive Summary
- COSEWIC Mandate, Membership and Definitions
- Lists of Figures and Tables
- Species Information
- Population Sizes and Trends
- Limiting Factors and Threats
- Special Significance of the Species
- Existing Protection or Other Status
- Summary of Status Report
- Technical Summary
- Acknowledgements and Literature Cited
- Biographical Summary of Contractors, Authorities Consulted, and Collections Examined
David T. Zanatta received a B.Sc. (Hons.) in Biology from Laurentian University (1998) and a M.Sc. (Zoology) from the University of Guelph (2000). His M.Sc. supervisor, Dr. Gerald L. Mackie, is currently chair of the Mollusc Species Subgroup Group of the Lepidoptera and Mollusca Subcommittee of COSEWIC. Mr. Zanatta’s thesis was entitled “Biotic and abiotic factors relating to distribution of unionid mussel species in Lake St. Clair.” Part of his thesis research, which documented the discovery of native mussel refuge sites in Lake St. Clair, will be published shortly in the Journal of Great Lakes Research. He has also studied Lake Trout populations in Northwestern Ontario lakes and analyzed Walleye index netting data for the Ontario Ministry of Natural Resources. He is a member of the North American Benthological Society and the Freshwater Mollusk Conservation Society. David is currently a research technologist with the National Water Research Institute of Environment Canada in Burlington, Ontario.
Janice L. Metcalfe-Smith is an aquatic research biologist with the National Water Research Institute of Environment Canada in Burlington, Ontario. She has a B.Sc. (Hons.) in Zoology from the University of Manitoba (1973), and 29 years of experience as a technologist (1973-1978) and biologist (1978-present) with the departments of Fisheries and Oceans (Winnipeg, Manitoba and St. Andrews, New Brunswick) and Environment (Burlington, Ontario). She has conducted research in several areas, including the effects of forestry practices and acid rain on Atlantic salmon, the use of benthic macroinvertebrate communities in water quality assessment, and the development of biological monitoring techniques for measuring contaminant trends in freshwater ecosystems. Since 1995, her research has focused on the assessment and conservation of freshwater mussels in Ontario. She has authored or co-authored over 60 scientific papers and reports, including 15 on biodiversity issues. She is a member of the North American Benthological Society, the Freshwater Mollusk Conservation Society, and the Mollusc working group of the Lepidopterans and Molluscs Specialist Subcommittee of COSEWIC. She co-authored five previous status reports on mussel species at risk for COSEWIC.
Badra, P. September 2001. Aquatic Zoologist, Michigan Natural Features Inventory, Michigan State University Extension, Stevens T. Mason Building, PO Box 30444, Lansing, MI 48909-7944.
Cicerello, R. August 2001. Kentucky State Nature Preserves Commission, 801 Schenkel Lane, Frankfort, KY 40601.
Clayton, J. August 2001. West Virginia Division of Natural Resources, PO Box 67 Elkins, WV 26241.
Cummings, K. August 2001. Illinois Natural History Survey, 607 E. Peabody Dr., Champaign, IL 61820.
Dextrase, A. November 2001. Ontario Parks, Species at Risk Section, Ontario Ministry of Natural Resources, Box 7000 Peterborough, ON K9J 8M5.
Fowler, B.T. August 2002. Co-chair, Lepidopterans and Molluscs Specialist Subcommittee, COSEWIC. Canadian Wildlife Service, Hull, Quebec K1A 0H3.
Garner, J. October 2001. Malacologist, Alabama Division of Wildlife and Freshwater Fisheries, 350 County Rd. 275, Florence, AL 35633.
Hartfield P. July 2001. U.S. Fish & Wildlife Service, 6578 Dogwood View Parkway, Jackson MS 39213.
Jacobs, C. October 2001. Walpole Island Heritage Centre, Walpole Island First Nation, R.R. 3, Wallaceburg, ON, N8A 4K9.
Jones, R. October 2001. Conservation Biology Section, Museum of Natural Science, Mississippi Department of Wildlife, Fisheries, and Parks, 2418 Riverside Drive, Jackson, MS 39202-1353.
Maffei, J. May 2001. Lake Erie Management Unit, Ontario Ministry of Natural Resources.
Marangelo, P. July 2001. Planning Ecologist, The Nature Conservancy, Michigan Chapter, 2840 E. Grand River Ave. #5, East Lansing, MI 48823.
Masteller, E. September 2001. Emeritus Professor of Biology, Penn State Erie, The Behrend College, Erie, PA 16563.
Shiels, A. September 2001. Pennsylvania Nongame and Endangered Species Unit, Pennsylvania Fish and Boat Commission, Bellefonte PA 16823.
Strayer, D.L. September 2001. Institute of Ecosystem Studies, Box AB, Millbrook, NY 12545-0129.
Sutherland, D. September 1999. Ontario Natural Heritage Information Centre, Ministry of Natural Resources, 300 Water Street, 2nd Floor, North Tower, Peterborough, Ontario K9J8M5.
Watters, G.T. July 2001. Curator of Molluscs, Department of Evolution, Ecology and Organismal Biology, Museum of Biological Diversity, The Ohio State University, 1315 Kinnear Road, Columbus, OH 43212.
In 1996, all available historical and recent data on the occurrences of freshwater mussel species throughout the lower Great Lakes drainage basin were compiled into a computerized, GIS-linked database referred to as the Lower Great Lakes Unionid Database. Data sources included the primary literature, natural history museums, federal, provincial, and municipal government agencies (and some American agencies), conservation authorities, Remedial Action Plans for the Great Lakes Areas of Concern, university theses, and environmental consulting firms. Mussel collections held by six natural history museums in the Great Lakes region (Canadian Museum of Nature, Ohio State University Museum of Zoology, Royal Ontario Museum, University of Michigan Museum of Zoology, Rochester Museum and Science Center, and Buffalo Museum of Science) were the primary sources of information, accounting for over two-thirds of the data acquired. The database continues to be updated and now has over 6000 records of unionids from the lower Great Lakes drainage. One of us (J.L. Metcalfe-Smith) personally examined the collections held by the Royal Ontario Museum, University of Michigan Museum of Zoology and Buffalo Museum of Science, as well as smaller collections held by the Ontario Ministry of Natural Resources.
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