|
<br />tlw ..,\pt"tinwnlal Ilu(H'1. a... \1ft-II ...., hi~h sit-ad\' dis-
<br />chargr,,> lhill folto\\"ed. Givt"1I the low 1.'n'l-.; of hYP"lim-
<br />Iwlie db-solved oX\'1!;rn that ..xistt"d prior to 1997 and
<br />tht" ha.l~lf(J<; of dlscharJ!,ln,C low o.''''~c'n. this ma" olfrr
<br />.1 tool for Ill,Ul<l~lng hvpoxla (low 0.11 Irv..1s in ltlt' fll-
<br />lurt".
<br />Nutrient results:
<br />Although rt"sults an- pnwisiollal. nutrknt It-vels
<br />throughout Powdl d('!nonstratt' a r""I>llflst- tn r..crnl
<br />cllrnatil" lrt'nds. Flgurt" 7 oi..,plays surfacl' ll11ln('nt \'al-
<br />LIt'S Irorn [......s FrITy 10 thr Colorado mllow stalums.
<br />alld /.!l'llrr;llly rt"pn-s,'nts or l'''''!1 l'Xag,gI'r.Ht'"S trrnos
<br />thrOlllothuut dt"Plhs of IJw rt"~'rYOlr. Ar-ros... tJl!:'" lakr
<br />and In ttlt' lailwaltTS, phosphonls values ha\'t" in-
<br />l'rrast"d sinn' 199:~. 111i", could ill" a rrsull of Ill.. in-
<br />crt'"asl'd inl10ws ill rrt...nl y..ars. or could b.. "",soclalt'"d
<br />\\,ith hioti(' inlrrat"lions. ;lIltl will n-crivr ..xt..nsl\','
<br />sludy In th.. hllurr. Orthn-phosphal", though oft..n
<br />rH',lf d..t..(~tion limits. shows ...Irnllilr rt'"sulls. ;'\itral..-
<br />nittit.' nilrrJgrfl atolle dt-ITl'J!l...tralt"S ('(In...islrnl!\' dl'-
<br />rrrasin/.! ('onl'rlllraliorls para]ll'llJlg rondUClilnt...
<br />lr..nds fin thr rf'...t'"n:olr. A... .....ould be t"X!.M'I'h'd, nutri-
<br />rill kvt'ls arr hl~hrst ;1\ lh.. innow ,lnd dt.erl'.l...... to-
<br />ward ttlf' dam. 5.'..sonal trends produ(',' I.h('- hic.tw...1
<br />conct'l1traUons aSSfM'ialt"d wllh Ihr intlow ,'\"..nl. wuh
<br />nulrit"nls flwlahollzn:l, mi.'wrJ and dllut..d Ihrough fall
<br />,lod "inler.
<br />Biological results:
<br />Much of Ihr plank Ion dala is In tilt' .'arly slag.'s 01
<br />analv...is. Fi~t1rr 7 sUlllmari.7I'S lfw dalil from an a.'rial
<br />rwrs!w(.th'r, ...IIOWin~ 111('- I..vrls of phvtoplankton bio-
<br />votulllt" ano I(M.lplanklon hiomass prrs..nl in lh.. rrsc'r-
<br />\'oir and tailwalt'rs for lilt' lao;l vt"ar. II ...llOws thaI pro-
<br />dm'\ivily for bolh flt"ak in spring and 'iUllUlIrr. Pri-
<br />TTlary prorhll'li\ily ilu-rras..s as t'arlv as Ft'I>nlarv rt'-
<br />"lilting in lilt' high spnng saturation lrvrb of o."\:\-"g"n
<br />in tilt' 1.lkl'. UlootIls of a]g.w and I-lNlplanktoll ,,!it'll
<br />folio..... \lointl'r lunl-ov..r, IrlCn'aslng nUlrkllls and
<br />I.\ramlt'r "'lIlp..r;Uurt"s ('orUlfllll' In fa\'lIr prodIH'Ii\-itv
<br />unlll prf'(lalinll and ..xc.t's.;:;ivt' hrat driv.. prndIH'Il\ity
<br />]o.....rr in thr walrr colllmn b~! laIr "'UrTlIlwr and falL
<br />For AUl.!llsl. ....Trhi d..pths ([<lhfr I, IIlap I) r..I1"I',,'d
<br />
<br />S",cchl n"'pth In nl",t.,rll
<br />AU!i:u..t 25-31. 2000
<br />
<br />
<br />,
<br />"
<br />
<br />..
<br />
<br />GCMRC 4nf1Uu! IWQP ReOOf1
<br />
<br />hl'ighlrlwd pnNluf"ti\il\' from ph\'loplankttJn 1.....1. chlo"
<br />rophyll 11'""1",, tahlr I. IIg.6). SlISlft'lhlOJl of ...1:'fhlTlt'nl~
<br />frolll Ihr ...pring I1(M)(j (il minor Illnlrihulor Ihis w'ar
<br />\\,1th lowrr intlowsJ. as Wt'lI a... "'OIlW -whiting- of It It'
<br />lakt' in tlw lilcLlstnJlr 101ll'S from slljwr-....lIuration of
<br />1'<I1('llIlTl carhonalt',.l fairly I'OlTlllltlI\IXTllrT"fl("r in lalt-
<br />Sllllllllt'r. Chlorophvll vahws ran~f'(i from 0.5 \(J :j mgl
<br />rn1 in Ill.. dU\\11-lakt'" !.MJrtlon" of Ihr rr...rr\-'olr. :lto 10
<br />Illg/1l1J in lilt" Iransili"flal portIOns. ,llld !'l-IO ITH!/m.l
<br />In thl~ inflow,>, rellt'"("lInj..! ...t'asonal pr;lk....
<br />
<br />111<" rangt'S of nutrit'"nts and prillliU,' pnxhwli\'Hv
<br />an' indieaUvr of a largr rr",.'rvoir """''''m with distilwl
<br />LIJI\..... hi\'rnTlt' 10 lilclIstrllld .tnd this gl'lwrilll~' e1c-rn-
<br />onstnlh.'s .t sysl"lII whi('h transitIons frum t!ltxlt'ratl'
<br />or lTwsolrophlc pnNlul'Ii\.ity 1lI ttll' trall...ition ZotW 10
<br />primarily oHl.!otrophlt. tlnw nlltrit"nl. low prodU("liVlly)
<br />in IIIf' low..r readw... of tIlt' lakt".
<br />
<br />Finlling", Oil thr rrs,'I"\'Olf lndudt'rl ....lllll' 1IIlUSllil]
<br />,'v"nls UlI-...hnrl'. In \1.\\', III<" app..ar~H1('r 01 rno~llli-
<br />fOI..... In two hays ;tt tilt' ]owl"r t'rul of lilt' lakt' was ex-
<br />prrit"lwrd for tlw firsl tUllt' 111 lIIallY Yl"ars. 1111<; may
<br />tw an eth'ct 01 tlw falrlv ...Iahl.. lakt. dr\'atlnn during
<br />Ihis sprin/.!. 011 lht, first ni.ght of Ilw AlI~IlSI trip. .\1'1rk
<br />And'T...on of GI..n (';myoTl .'Ilillional 1~':'fTI'<Ilion Arl'.1
<br />had a Illlsad\"t"nlu(l' Wilh a rallll'snakt'. -[ thoughl f
<br />klckt"tl a 1';\CtuS". A ...ound hltl' on lilt. tot' "',Id 10 a
<br />midnight hdil"fJplrr oul. hill h., n.turTlt'd 10 tilt' (rip In
<br />.1 dav .lIld a half. /.!alnlllj! Iflt' Troop.-r AW;lrd. Otlwr
<br />unu"'Ilill uildlll.. Indud..d an illlpft'~~i\'l' hilt fair]\, 1.11"-
<br />lIign ~1<1Il1 hairy scorpIOn lIndnlflL<; ~,,(ulix, and Hlt"
<br />rarf"st "'lghlinl.!. ;l [n'..hwalt'r jt.IJ.\.fjsh. Cru....p"dncustu
<br />s()tI~'rblji, 111<' J..llvr....h was fOllnd hy a park vi...i(or in
<br />Oak Canyoll. nlis Is Iltr onlv kno.....n ...po,.'it's 01 fn'sh-
<br />wat..r ]t'1I\'fish in tilt' U.S.. hili though ...1','1\ on fare
<br />nf'Tilsinns. It appt'ars nol 10 h.. t!(N'lllllrlltl'd III L.:lkt'
<br />P.JW,.]].
<br />
<br />Acknowledgments:
<br />11lt" lnlrgr.llrd \\'att'r Qllalil~' I'rn/.!nllll wlslw... 10
<br />thank Gkn Can\-"on Naliollill R"(Tt"atioll Ar..a for as-
<br />sist,lnn' of 1>I'r,;:;ol1nl'l anrl t"ljlllplllt'lll. Appn-cia-
<br />lion IS ('.'I."110('d 10 (jCMHC ~I;tff ilnd l/w manv
<br />"'lIpporlrr... of lhr f\\'QP ,lIld vOIUlltl't'fS who as-
<br />si...It'd in ('(,III'.'lInIlS.
<br />
<br />ro
<br />19 For tllnlwr intonn;IU(JIl. plra,.... ,",'lll;wt:
<br />"
<br />17 (;rnnd ('allYOII \1ollllOnll~ & Itt'",'an'h ('~nl,'r
<br />lIS SII""'n Iltwftl....
<br />..
<br />l4 shudllt'~Cll...gS.go'"
<br />132255:.0 G....mini [lr
<br />12 Ftagsl_'ttf. AZ ,"I;{~)l 11;00
<br />1 l Olfin'; 520.556.7.11,0
<br />10 Fax' 520 551i 7::lh'"
<br />"
<br />R .
<br />,
<br />R
<br />,
<br />.
<br />,
<br />,
<br />,
<br />o
<br />
<br />
<br />\l.lp I. All;!IISl 'on .....(-rhi dl'pl/).. ,It'm.... I~lk.. Pnlll:"ll
<br />1l11h IIIHp 01 <;.1,1110n.. <;;lnlpk-d In W)"20(lO. [...k., "'net I!
<br />,]]<>111.( 11n- main ('hamwll.. 272 kmll:>.1 milc'..llnom
<br />dam to D.-trkCall\1J1L
<br />
<br />Semerrooer 2(U)
<br />
<br />j
<br />
|