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Dominance of fine sediments and low water temperatures were associated with a high site-specific contribution to whirling disease risk.
Application of dataset:
The site-specific contribution to whirling disease risk and density of infected T. tubifex were negatively related to water temperatures, and low maximum water temperature was the best single predictor of the site-specific contribution to whirling disease risk. In other studies, the severity of infection in trout was positively correlated to water temperatures in Willow Creek, Montana, and in three drainages in Idaho (Baldwin et al. 2000, Hiner and Moffitt 2002).
Water temperature affects the development of the parasite in rainbow trout and T. tubifex (Halliday 1973, El-Matbouli et al. 1999, Blazer et al. 2003, Kerans et al. 2005). Furthermore, high water temperatures (25
308C) can inhibit M. cerebralis infections of T. tubifex in the laboratory (El-Matbouli et al. 1999). Thus, water
temperature may influence infection in T. tubifex, and thus whirling disease risk.
While conductivity has been shown to be related to stream productivity and M. cerebralis infection in other studies, the present study did not indicate this relationship.
See also :Krueger, R. C., B. L. Kerans, E. R. Vincent, C. Rasmussen. 2006. Risk of Myxolobus cerebralis infection to rainbow trout in the Madison River, Montana, USA. Ecological Applications, 16(2), 770783
Montana
Department of Ecology
Montana State University
Bozeman, MT 59717
Whirling Disease Initiative (funding)
Montana Water Center
101 Huffman Building
Montana State University
Bozeman, MT 59717
Phone: 406.994.6690
Email: water@montana.edu
(DO, mg/L), conductivity (mS/cm), and pH of the water in each side channel were measured with a Yellow Springs Instrument multimeter (Yellow Springs Instruments, Yellow Springs, Ohio, USA). These measurements were taken with every oligochaete core and oligochaete kick net sample (see Krueger et al., 2006), for a total of 1014 measurements for most side channels.
Small variations in the number of measurements taken in each side channel were the result of multimeter malfunction on some dates. Two side channels (Palisades, Grizzly) had fewer measurements (N=3) because the oligochate kick net sampling was not conducted there.