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271 <br />Table 1. List of Fish Species Present in the Study Area with Population <br />Abundance Rating <br />Common Name <br />Scientific Namhl <br />Population Ratin <br />Cutthroat trout Salmo clarki Richardson <br />Dolly Varden Salvelinus malma (Walbaum) <br />Rainbow trout Salmo gairdneri <br /> Richardson <br />Mountain whitefish Prosopium williamsoni <br /> (Girard) <br />Chinook salmon Oncorhynchus tschaw tscha <br />(summer chinook) (Walbaum) <br />Steelhead trout Salmo gairdneri Richardson <br />Brook trout Salvelinus fontinalis <br /> (Mitchell) <br />Northern squawfish Ptychocheilus oregonensis <br /> (Richardson) <br />Suckers Catostomus spp. <br />Redside shiner Richardsonius balteatus <br /> (Richardson) <br />Dace Rhinichthys spp. <br />Sculpin Cottus spp. <br />Pacific lamprey Entosphenus tridentata <br /> (Gairdner) <br />Abundant Common Low <br />x <br />x <br />x <br />x <br />x <br />x <br />x <br />2E <br />E <br />E <br />x <br />x <br />E <br />'Scientific names according to the American Fisheries Society (1970) list of <br />common and scientific names of fishes. <br />2E = estimate only. <br />In another geomorphic type, valley glaciers created U-shaped canyons with high- <br />gradient streams and broad streamside buffer zones. Here large valley glaciers <br />intercepted and undercut smaller tributary glaciers, creating hanging valleys <br />with some stream sections being almost vertical. At lower elevations, glacial <br />deposits contain larger streams with less channel gradient. In the fluvial <br />lands, streams have formed narrow V-shaped canyons. Streams with relatively low <br />channel gradient occur in water-formed depositional materials. <br />The study streams offer a wide spectrum of aquatic habitat types represen- <br />tative of mountainous streams in the Batholith for testing validity of the method- <br />ologies used. The study streams are in natural or near-natural condition and