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<br />43 <br /> <br />two river., the greatest environmental variations observed weN vater <br />tempe1'at.uzoe and turbid1t7 during the low water seasons. Additional <br />,..ar-roUDd .asur_nt. ot these variations along with studies ot the <br />preterred habitats of the fish faunas mq aid in understanding the <br />reason8 tor their distr1but1on. <br /> <br />Bottom types <br />Two obvious dirterences in bottom. type were observed in the <br />Green and Yampa rivers. The JOOst Q01lDJK)n type typio&1. ot the slower <br />sections with reduoed gradients consisted predominantly ot very tine <br />.silt and sand whioh was continually lShitt.1ng and abrading, expeoially <br />during the high run-ott seasons. This bottom type contained some small <br />u-.as, bowever, which were hard-paoked and stable. Partially buried <br />sticks and snags were distributed throughout IllOst or the stream sections <br />whioh bad this bottom type. A faw small isolated areas of rubble and <br />rook were also found at SOllie of these locations. The second distinotive <br />bottom type observed primarily in steop-walled ca.nyon areas 'Was composed <br />ot small pebbles, rubble, rooks, and boulders. <br />The sampling area.s at BroW'1i Parle Uridge and Gates of Lodore <br />(F1gure 17) bad primarily type 1 $llbstrates. The Eoho Park (Figure 18) <br />aM Island Park (li'1gure 19) sampling areas were oomposed mostly ot type <br />2 substrates. A third type, arbit.rarll.y called a combination type, <br />was reoognized at Split l'ountain (i'"'1.gure 20) and Castle Park on the <br />Iampa River (Figure 21). This third bottom. type consisted ot <br />alternating stretohes ot silt and sand and rubble and rock. <br /> <br /> <br />=, <br />