. The Canadian field-naturalist. 128 The Canadian Field-Naturalist Vol. 98. Figure I. Shorthead Sculpin (Cotius confusus). Courtesy of D. E. McAllister, National Museum of Natural Sciences. Upstream portions of the Flathead River, Com- merce, Sage, and Kishinena creeks possess predomi- nantly more Shorthead Sculpins than Slimy Sculpins and consequently this does not entirely support infer- ences of Bailey and Bond (1963), Stanford and Potter (1976), and Lee et al. (1980) that C confusus occurs further upstream than other sculpin species. These authors probably refer to other syntopic sculpins
. The Canadian field-naturalist. 128 The Canadian Field-Naturalist Vol. 98. Figure I. Shorthead Sculpin (Cotius confusus). Courtesy of D. E. McAllister, National Museum of Natural Sciences. Upstream portions of the Flathead River, Com- merce, Sage, and Kishinena creeks possess predomi- nantly more Shorthead Sculpins than Slimy Sculpins and consequently this does not entirely support infer- ences of Bailey and Bond (1963), Stanford and Potter (1976), and Lee et al. (1980) that C confusus occurs further upstream than other sculpin species. These authors probably refer to other syntopic sculpins in drainages from other parts of the species' geographic range outside Canada Mottled Sculpin (C bairdi). Torrent Sculpin (C. rhotheus). Prickly Scul- pin (C asper), Coastrange Sculpin (C aleuticus), etc., which are also known either further south or in por- tions of stream and river systems that are downstream from Shorthead Sculpin populations. Between 1980 and 1981, field crews of the British Columbia Provin- cial Museum did not find any changes in the zones of distributional overlap between Shorthead Sculpin inhabiting the Flathead River. Continued monitoring is needed to see if there are long term changes in distribution. Protection No specific or special measures for Shorthead Scul- pins are now in force. Existing federal and provincial fish and wildlife, water quality, resource management laws, etc., probably offer some minimal protection. Population Size and Trend On the basis of approximately 400 specimens of Shorthead Sculpins captured in August 1981 (Figure 3), we believe that there is a substantial population in the lower Flathead basin of British Columbia. Scul- pins were caught using an electrofisher (Smith-Root, Vancouver, Washington, powered by a 12-volt bat- tery and operated at 425 volts with a pulse of 7 milli- seconds and a rate of 70 pulses per second). Shorthead Sculpins were drawn to the equipment from distances of one to two metres and at a rate of
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