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<br />Fig. 3 M..iln ch..rm'::iI] c....r;lct..nsllG of
<br />sit.. group"'p .'1$ defined by d...twndl."d
<br />COnl;"5pondt'llO.. ana]ySO"!O. Error b.1rs =
<br />5tandard ..rrur; SW, ~urfa(l,' wat,.,.; HW,
<br />hyporhelc wiltt'r: N~, nltrat.. -+ mtrite-
<br />N; arg. orgilmc mtrogom ... ammonia-
<br />N; N~, nitril.~N; NH", ammuni.1-N;
<br />Tr. total rhosphoru~
<br />
<br />Fig. -I Shdnnon dlWl"!';lty ind.., for t'..rn
<br />sil...disrlay,.,j~dt'tn>nd..,j
<br />correspondt'nCt' ol1'\3lyws (OCAI
<br />ordLflation a'~_ Thr largt'r thl.' circle,
<br />tho> gll.'alerth<>dl\'i"rsity.s...e Fig.:! for
<br />.,It... abbll'Vloltioru> olS,iOCiatro With ..ach
<br />CIrcle_
<br />
<br />OG~j7 33
<br />
<br />I/tllt:Ttebralt'S of the South Platte Rit't7 449
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<br />Discussion
<br />
<br />scrapers and predators romJX~ less than 7% of tht'
<br />total. Plains/tributary and plains/downstream from
<br />point-source h..1d similar functional f~ing.group
<br />composition; collector-gatherers. rollt'Ctor-filterers,
<br />dnd predators composed 93.1-935% of the total. and
<br />shredders and scrapers composed les.s than 7% of
<br />the total.
<br />
<br />CJwracteristics of iml(rtt'bra/t' comltumitirs
<br />
<br />~tacmin\"ertebrate spt'Cies richnt'SS and functional-
<br />fl~ing group:; of maror taxonomic groups are pr.....
<br />dicted 10 ch.J.nge along a gradient from small to large
<br />stream:; in the Rock}" ~Iountai.ns (Bruns t't al.. 1982;
<br />
<br />() 1'~6 Blackw..U s.:--wn.:--.. lid, F~uln Biol"fY, 33, -I.N-G-I
<br />
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