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<br /> <br />.. J <br /> <br />J. $, Covington and W. A. Hubert <br /> <br />L&J V"'- <br /> <br />IO.S <br /> <br />Tab~e 3. Estimated total bion1B.sS and abundanoe of broWn trout in each study stream in the Sa)r River Vaney at <br />differIng proportions of average daKv flow (AOF)~ <br /> <br /> Proportion of An F (%] <br />Str=m 16 60 .50 ~o 30 20 <br />titamaSli {kg) <br />Stt::lWb<;lT)' Cre~k 15R 110 92 70 46 23 <br />WiJ low Craek 144: 106 ss 64- 4~ ~l <br />Swift Creek 74 04 44 S2 22 IJ <br />Dry Creek 41 !ia 2~ 1a 12 0 <br />CO{WtltrUCQ C.'eek 146 107 85 134 43 21 <br />Upper Salt River ~82 ~7S 219 164 109 55 <br />Crow Cn::ek 410 gOl 241 lS1 120 cO <br />Srt~m p C,-edk &"1 41 38 28 19 9 <br />Abundance {i~ ~ 1 )fcar1old) <br />Stnwh erlY Cttt:k 3092 2271 181'9 1364 909 15~ <br />WiUow Creek 2826 2078 1662 1247 83' 416 <br />Swift Cree].: 1415 1068 B50 ass 425 :21R <br />Dry Creek 805 S92 474 $55 2a1 118 <br />COltonwood Cre~k 2865 2107 1]6B5 1264 843 421 <br />Upper Salt lU-vcr 74S1 5380 4S{J~ a228 21!i2 1070 <br />CI'OW Cr~ek 8012 5906 4725 S54~ 2362 1181 <br />g'.ltmp Cl"~c k 12S0 920 ''''11 556 371 )85 <br />~.Nal\Lral ~uer;J~q'C .,\npull-:r nCh'l ~Bt 78% AOf, <br /> <br /> <br />Tab's 4. EstImated biomass and total l,umbgr of <br />broWn trout (~1 year old) in Salt Aive( Veney study <br />streams at ttlree sp8ci1~c summer flows <br /> ~O\v5 (rn}} I:s.ec} <br />SU~e3D) 0.25 Ot50 O~75 <br />Biomw (.kg) <br />Stl"awbz:rry CTc.~k (5 36 co <br />Willow Credk ]9 60 101 <br />Swirt Crttc:k a 10 .21 <br />DIY Cc~r:k. ~l) 38 60 <br />CottOnwood Creek 20 01 102 <br />Upper ~al r Rivet 30 lPB 189 <br />Crow Creek. 18 96 174 <br />Stump Creek 25 60 94 <br />Abund3nc:e (.N) <br />Su"ttwh~rry Creek 12.7 708 129U <br />'Willow C..~~k 38] 1179 1977 <br />Swift Cn:el.t 0 ~O4 413 <br />D 1"" Cret: k. 517 752 1188 <br />Cottol1woad ere ek 3S? 119S 2004 <br />Upper Sal~ River 586 21t8 3708 <br />Crow Crealc .351 1884 .9418 <br />!tump Creek 496 1177 1859 <br /> <br />biomass eStln1stes ranged from 0 to .30 kg and abu.n... . <br />dance estima[~ .from 0 [0 586 fish in the study streams~ <br />A 0.25 m.3 /sec flow ~ did nor appear to aJ]ow a b("own <br />trout stock to OCCUr in S-wift Creek, and a relatively <br />~llla1J stock would occur in the:: Upper Salt River (8% of <br />th e 382..kg bioma'i." predicced at natlJ.raJ average sum. <br /> <br />tIle.... flo~) ~ VYl1en we t:V3luared [he' effects of a 0.75 <br />m! Isec flow in each stream, res ultall t biolnasses ranged <br />from 21 EO 189 kg and 4:13 to 570B fish among ~he Ntucly <br />streams. Again~ the la.f~est fishery benefit was predicted <br />[0 occW. in the Upper Sa) t Riyer.. <br /> <br />DiscuS$~on <br /> <br />Our approac;h call be used to a~se$S the effect':' of <br />la.rge...~cale spatial variability t(\ habita~ features and dif.- <br />fering flQ~ regimens downstream from -wat~r diver$lOn:ji <br />on tr-out biomass and abundance over long strean"l, <br />segments. Howeveri' mere are several predictive models <br />ar),d nl.1.me;rQUs as.;!:,un'Jption~ needed to a.pply th~ tech- <br />nique, an contributing to uncertainty in the predic- <br />tloras. The approach is best applied to assess relati~ <br />dUtcl"ences in ~abund~ee or biomass. an\on.g st:.reiJ.nl <br />s.egments ~r within a ~insle segment at different tloWSt <br />The biomass an d abundance:: 'Values obtained dl ro.ugh <br />the aggre~tion of models Md assu.mpnon's should nuL <br />be 3.$!umed to be accurare pt'cdicdons. <br />We applied OUt.. approach to stream.s "With brown <br />~rout in the Salt River Va.lley. Wyo111ing. flowe-vel... nlod- <br />eb~ al1d clnphicaJ data2tt': available or can be developed <br />lO make the approach applicabfc Co tl'out species in <br />oilier ~acC!:rsheds of the Rocky Mountain regio.l1~ Po." <br />ex~mple. P'ausch and others (1988) reviewed over 20 <br />llabl~t models that use large..scaic varIables co predict <br />trout biom3.S$. Br.ooks al1d ot.hers (1997) d~scribed ge.fr-..o <br /> <br /> <br />- <br />