. The Canadian field-naturalist. Natural history. 252 The Canadian Field-Naturalist Vol. 115 Twelvemile Creek Canada. Moore Creek inlet 1 >>L lake inlet 2 ^ pR weir inlet 3 Moore Lake Figure 1. Locations of Moore and Twelvemile creeks in Mineral County, Montana, USA, and detail of Moore Creek showing locations of weirs (bars) and temperature recorders (stars). The lake weir was about 75 m downstream of the lake outlet and 5 m downstream of the upper temperature recorder. The lower weir was 120 m upstream of the confluence with South Fork Little Joe Creek. Materials and Methods Moore Cree
. The Canadian field-naturalist. Natural history. 252 The Canadian Field-Naturalist Vol. 115 Twelvemile Creek Canada. Moore Creek inlet 1 >>L lake inlet 2 ^ pR weir inlet 3 Moore Lake Figure 1. Locations of Moore and Twelvemile creeks in Mineral County, Montana, USA, and detail of Moore Creek showing locations of weirs (bars) and temperature recorders (stars). The lake weir was about 75 m downstream of the lake outlet and 5 m downstream of the upper temperature recorder. The lower weir was 120 m upstream of the confluence with South Fork Little Joe Creek. Materials and Methods Moore Creek (St. Regis River drainage, Mineral County, Montana, 47°11'N, 115°15'W) is km long and is fed by Moore Lake, a 16-m deep, hectare, headwater lake at 1620 m elevation. About 320 m of shoreline separates the closest of three, small, lake-inlet streams from the outlet stream (Figure 1). During late summer low flows, average wetted stream widths ranged from m near the lake outlet to m near the mouth, channel slopes ranged from 10 to 19%, and average maximum pool depth near the lake outlet was m. Riparian veg- etation was predominantly Western Redcedar (Thuja plicata) forest. Twelvemile Creek is larger, longer ( km), and more moderately sloped than Moore Creek with wetted widths ranging from to m in summer and channel slopes from to %. We intermittently counted Tailed Frogs trapped at two weirs in Moore Creek (Figure 1) from 6 August to 9 October 1997 (dates shown in Figure 2) and at four weirs in Twelvemile Creek from July through late September 1997. We checked traps every 2 to 3 days during operation, and the longest period with- out counting frogs was 12 to 28 September, 1997. The weirs, constructed of mm hardware cloth, consisted of two traps facing in opposite directions and connected to each other and to shore by a fence (see Figure lb in Gowan and Fausch 1996). An apron buried in the substrate prevented animals from easily pas
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