. The Canadian field-naturalist. Range Extension and New Locality Records for the Stonecat, Noturusflavus, in Manitoba: Evidence for a Recent Natural Invasion Bruce R. McCulloch^ and Kenneth W. Stewart^ 'Westworth Associates Environmental Ltd., Suite 140, 9405 - 50th Street, Edmonton, Alberta T6B 2T4, Canada ^Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada [corresponding author] McCulloch, Bruce R., and Kenneth W. Stevt'art. 1998. Range extension and new locahty records for the Stonecat, Noturus flavus, in Manitoba: evidence for a recent natural invasion. Cana
. The Canadian field-naturalist. Range Extension and New Locality Records for the Stonecat, Noturusflavus, in Manitoba: Evidence for a Recent Natural Invasion Bruce R. McCulloch^ and Kenneth W. Stewart^ 'Westworth Associates Environmental Ltd., Suite 140, 9405 - 50th Street, Edmonton, Alberta T6B 2T4, Canada ^Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada [corresponding author] McCulloch, Bruce R., and Kenneth W. Stevt'art. 1998. Range extension and new locahty records for the Stonecat, Noturus flavus, in Manitoba: evidence for a recent natural invasion. Canadian Field-Naturalist 112 (2): 217-224. Range extensions and new locality records for the Stonecat in Manitoba are given from the Red and Assiniboine rivers and their associated tributaries. Maximum potential dispersal in the Assiniboine, Little Saskatchewan, Souris, and Rat rivers has been realized due to the presence of dams. Absence of Stonecats upstream of these dams suggests that the records of the species in Manitoba in the 1920s are erroneous, and instead supports a more recent invasion coinciding with the first authenticated record in 1969. Collection records of the species from the United States portion of the Red River support the theory of natural invasion from the upper Mississippi River drainage to the headwaters of the Red River drainage at Lake Traverse during high spring meltwater conditions. Further range extensions in the Hudson Bay drainage may occur in Lake Winnipeg and the rivers flowing into it. This may be limited by the minimum water temperature at which Stonecats will spawn. Key Words: Stonecat, Noturus flavus, Manitoba, Red River, Assiniboine River, invasion, dispersal, dams. The Stonecat, Noturus flavus, (Figure 1) has the greatest longitudinal distribution of any of the twen- ty-five members of its genus (Lee et aL 1981), and in recent years first state and provincial records have been documented in Arkansas (Buchanan 1973), Colorado (Platania et al.
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