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<br />Southem Rocky Westem High Plains Ecoregion <br />Mountaln~ECOregiO~r~"'- ..1..-....... ..--. .~. ~" <br />r ~ ~ ~ /-J -..../'..--...........-..21 . 10,0. 21 <br />.-......"" "'--'1 "----_ _______~:.J' - ~~.., <br />-------.... ----.. r " . ~ _ "~ _ . <br />.,o..L;' _~____ _____---. ...~. \ "__ /"0' <br />r' \ l"l'~"-""- ...J ..~-..... <br />J~ \ ~~.r' <br />/, '- / <br />\r ,."r- J/ <br />,~~, ~) <br />)._. ~~.M' '( <br />· ~ \ f <br />1,-. ) , <br />"'-~: ~~...."DPNfIl < <br />t;:; 7 .....), <br />~/~~ ~~ I~ <br />>>.l~J) l/ ~ <br /> <br />~' <br />\""',"-' <br /> <br />OfllJ"i31 <br /> <br />, <br /> <br />iIO MILES <br /> <br />'" <br /> <br />o 20 '*0 !un <br /> <br />lllI't'rtebratt"S Of tI'l' SOli/II Platt.. Ril'l'r 4-11 <br /> <br />EXPLANATION <br /> <br />20 <br />T <br /> <br />""- ... <br /> <br />- <br /> <br />~btNIo~~ <br />""- <br /> <br />WVOM"" <br /> <br />I <br /> <br /> <br />"""""'" <br /> <br />Fig. 1 Molp 01 th.. 51.ulh Platte Rjvt'r 6..151" ~Wll"'g It.... I"Cilllllll of ...mphng silt"fo, Sit.. numbt-n .m.:! I\dm.... an> lisl...J II' T..ble 1. <br /> <br />I <br /> <br />Int't"rtebrate stntfplillg <br /> <br />Qu,mtil.lt1\"t' Sdmples of invertebrates were collected. <br />from the h,\bitat (i.t' sites of stable su~tratf;'S :-ouch a... <br />rod....., grewt'!. gra\'t'I with attdched macrophytes, or <br />wood) within it stn>am reach assumed to h.we the <br />most din'rst> faun,l for that reach. Stable substrall.'S in <br />s.mdy channl'l stn'ams typically art" sitt"S of most <br />biological productivity (Benkeet al., 19&4), and as such, <br />these sites Me suggl.>sted to be thl' ~t habit.lI to <br />sample for among-sitt.' comparisons (Richards t"t al., <br />1993). Two s.lmpling methods .....ere lL'>t'd to collt'Ct <br />invertebrates. A wmposite oj thrt"t:' Surbt.'r samples <br />(total area ='" 0..2787 m-2, 210-jlm mesh) were taken in <br />riffle areas. At two sitt.'S .....here run habitats dominatt.>d <br />(SPRO and SPNp, Table I), snags (submerged woody <br />debris) Wl'f'e cut ,md placed into a :!lO-)J.m-ml.>sh <br />net and invertebrates '..-ere remon-d. 5.J.mples .....ert' <br />r~r\"oo in 70% l.thilnOI, idt>ntHied to lowt'St possible <br /> <br />e 1<N5 Blad.....l'lI 5<;1,'IK(,' ltd, F'r.;hutolln Rrolc:.'l/. 33, HQ-4:'>4 <br /> <br />taxon, and counlt.>d._ Surfao.- area of sndgs was estim- <br />ated by wrapping a snag with aluminium foil and <br />measuring the an>i1 of the f{liL <br /> <br />Enl'iro1lnlt"ntal variables <br /> <br />Disch.uge (Buchanan & Somers, 19(9), stream \"t'locity <br />and chdnnd width and depth .....l'rt" measured, the <br />domindnt and subdomin.:mt bt>d substrate typ.,s <br />(Meddor l'1 01., 1993) were recordt>d, ,md a qualitative <br />a~".es...ment of algal abundance (abundant. common, <br />rare, absent) was made at one or two tran"t'Cts nt.'ar <br />the inn'rtehrate colll"Ction site. 5.1mples of surface .md <br />hyporheic (8-M cm below tht' stream channel) wilter <br />were collectt."d and ana lysed for ammonia-N, <br />mtrate .. nitrite-No nitrite-;-';, organic nitrogen.... <br />ammonia, and total phosphorus (\k\.tdhon l't al.. <br />199-1). Hyporhcic water s.amples were coUt."Cted to <br />