Status of Freshwater Unionid Populations at Isle Royale National Park, 1999-2001
Nichols SJ, Crawford E, Amberg J, Allen J, Black G, Kennedy G. 2001. Status of Freshwater Unionid Populations at Isle Royale National Park, 1999-2001. U.S. Geological Survey, Great Lakes Science Center. Ann Arbor, MI
Eleven inland lakes on the main island of Isle Royale and one Lake Superior cove were quantitatively sampled; two other lakes were only visually surveyed. All types of inland lakes were represented in the quantitative sampling, including oligotrophic, cold water lakes (Desor, Siskiwit), shallow wetland lakes (Feldman), isolated perched lakes (Hatchet) plus some of the most heavily used lakes on the island (Chickenbone- Livermore- LeSage corridor). Water quality data and morphometric for most of these eleven lakes was obtained from Kallemeyn et al. (2000). The sampling program included visual scouting of rivers and lakes to determine where unionids are located, followed by intensive sampling by SCUBA divers in waters where unionids are found. The location of quantitative samples, associated GPS coordinates, and further intensive diver surveys of unionid areas are presented in Figures 2-11. Unionids were found in nine of the twelve sites, being absent from Feldtmann, Hatchet, and "Leech" lakes. During the initial scout trip during 1999, various outlet streams associated with these lakes were qualitatively surveyed, and no unionids were seen in these streams. No exotic bivalves, zebra mussels or Asian clams specifically, were found in any inland lake or adjacent Lake Superior waters.
- Type
- Published Report
- Authors
- Nichols, S; Crawford, E; Amberg, J; Allen, J; Black, G; Kennedy, G
- Date of Issue
- 2001
- Publisher
- U.S. Geological Survey, Great Lakes Science Center
- Units
- ISRO
- Keywords
- Bivalves, chlorophyll a, Freshwater Mussels, Isle Royale National Park, Michigan, Unionids, Water Chemistry, Water Quality