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<br />it . ~ :--
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<br />TABLE 2. COt-iPARLr:;ON OF FISH SPECn:s AS COllECTED A!r FIVE STATIONS m
<br />DINOSAUR N!iTIONAL MONUMeNT, OCTOBER 1961 AND 1962.
<br />
<br /> Species stat ion Location*
<br /> (Common name s ) 1961 1962
<br />.'.. Flannel-mouth sucker 1, 2, 3, 4, 5 1, 2, 3, 4
<br /> RoundtaU chub 1, 2, 3, 4, 5 1, 3,4
<br /> Humpback chub 3
<br /> Bluehead Mtn. sucker 1, 2, 3, 5 4
<br /> Colo. mottled sculpin 1, 3, 4, 5 4
<br /> Green sunfish 4
<br /> Utah silversides minnow l, 2, 3, 4, 5 1
<br /> Green River Spring dace 1, 2, 3, 4, 5 1, 2, 3, 4
<br /> Colo. River equailfisb. 1, 2, 3, 4, 5 1
<br /> Carp 1, 2, 3, 4, 5 1, 2, 4
<br /> Channel catfish I, 2, 3, 4, 5 1, 2, 4
<br /> Black bullhead 1, 2, 3 1
<br /> Fathead minnow 7** 3
<br /> *1 Split Mountain Gorge
<br /> 2 Island Park
<br /> 3 Echo Park
<br /> 4 Mantle Ranch, Castle Park (Yampa River)
<br /> 5 Gates of Lodore
<br /> **7 Beaver Creek, North of the M.:,mument
<br />
<br />vould suggest a greater concentration. The tirJe of year for both samples
<br />vas approximately the same. The rate of decrease in organisms at Split
<br />Mountain is approximately 35 per cent, at Echo Park 86 per cent, and
<br />74 per cent at Lodore. -There were no comparable data for Island Park
<br />in 1961. It is obvious that the ~stream pollution of the Green River
<br />seriously reduced the numbers of aquatic fish food organisms within
<br />Dinosaur National l~n~~ent.
<br />
<br />TABLE 3. COMPARISON OF INVERTEBRATE COLLECTED P:f FOUR STP:fIONS ON
<br />THE GREEN RIVER IN OCTOBER 1961 AND 1962.
<br />
<br /> Lodore Echo Park Split Mtn. Island Park
<br />Order 1961- '62 1961- '62 1961- '62 1962*
<br />ColeQ,pt;era 0.0 0.0 O.l 0.0 0.0 0.0 0.0
<br />DJptera _. 12.0 4.7 0.3 1.5 4.5 4.5 20.5
<br />Epbemerida 9.0 .5 9.8 0.3 8.0 4.3 8.0
<br />Hemiptera 0.0 0.0 0.7 0.0 1.5 2.0 0.5
<br />Odonata 0.4 0.5 0.2 0.0 0.0 0.0 0.2
<br />Plecoptera 1.5 0.3 1.5 0.0 4.5 0.7 0.0
<br />Trichoptera 0.0 0.0 0.0 0.0 0.0 0.5 1.3
<br />Average Number
<br />of invertebrate
<br />per square foot 22.9 6.0 12.6 1.8 18.5 12.0 30.5
<br />*No data were available for Is land P"ar k in 1961.
<br /> --r-
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