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<br />below Ihe Grand Valley, particularly below
<br />Weslwater Canyon, food is lhe limiling
<br />resource for adult Colorado pihminnow,
<br />whereas al some poinl upslream of the
<br />GrandValley,tcmperalurebecolT\C'slimiling
<br />The Grand Valley appears 10 representlhe
<br />besl available balan~e belween lh~ Iwo
<br />conslraining resources Also, floodplain
<br />habitats. believed critical in meeting lhe life
<br />hisloryneedsoftlllorbacksu~ker,aremore
<br />pk-mifulln the I1nodplain of the Grand Valley
<br />than in more cOnfined reachesdoWT1slream
<br />Bascd on this understandingoflhe hfe
<br />hi'lOryalldccologiealrequirementsofColo-
<br />radopikeminnowa.ndrllZ(lrbacksucker,ilis
<br />lhe position of the U, S Fish and Wildlife
<br />SCl'Vicethat the prime adult habilat fOtlnd in
<br />Ihe Grand Valley, including the 15.mile
<br />reach,muslbepreservedandenhanced The
<br />poPlllationofsubadllltandadultColorado
<br />pil<eminno....' in the Colorado Rivercurremly
<br />consists of only about 600-800 individuals
<br />(Chmundson and Bumham ]998, Osmund-
<br />sonI999b) An increase in the rrequency of
<br />,twng year cla.,$l's is needed to booSllhe
<br />size of this population. ForthcncarlyeKtir_
<br />patedruorbacksllcker,stocking....illfirslbe
<br />required 10 eSlablish an elfn:live breeding
<br />population, natl.lraliled reproduction and
<br />re<:ruitment willlhenbcnccl'"Ssary for lhe
<br />populalion to become self.suslaining Uow.
<br />ever, in addition 10 recruitment limitations,
<br />quality adult habitat for both SpeCll:'S is cur.
<br />rently in short supply. To addreM Ihis
<br />shortfall, nul only will access to historically
<br />occupied reaches needtobcreslored,bul
<br />managemenl elTorts mUSI also focus on
<br />preserving and enhancing condilions in the
<br />Grand Vallcy(incllldlll[llhc 15-milereacbl,
<br />"here lhl' Desl a\"ailablchabilal foraduh
<br />C'olorado pik..mirmow and razorback suckt'f
<br />currently nists
<br />
<br />0007"1
<br />
<br />ACKNOWLEDGMENTS
<br />
<br />Th.. "'flOn ,,,'s I'lllI<le pos,abk 1>)' .heoolkc!lve
<br />clTonsofnmncrous,."",arch."sand ',ddtochlll-
<br />cia", ,..,,~,~ on ~ ..uie~ of proje<;l. fklpful
<br />rC\'lc,"",ofeorlic'..cr.;lonsoflhisrq>onwcrc
<br />p",,'idcd b)- O"lIIcl B~'c...., John IIiI...klns. Item}
<br />Mad<lo~. Thomas Ne<ler. frank Pfe,fer. Oil.id
<br />Prop<!andRi<hValdu fo.merR""""eryprogram
<br />Dll'CClorJohnllallllllorigi.wI~'pelt""~lhcnced
<br />fora llynth",,", oflnfo"""lioo""."" I~-mile"""h
<br />
<br />LITERATURE CITED
<br />
<br />Ao<lors<>n, R M 1991. An evalual;on offl5l>
<br />oomm"o"y.I'U<lUrc'ndh.,b,Lalpolrnllllf{lf
<br />Colorado "l"""r;.h and rdlort..cl< tucker in
<br />lheoooccupicdn:achfPali<.l<k.oRlIk)oflhe
<br />Colo""'" Ri,'er, l<;l9J.199~, final R"""n
<br />Colorado Division ofWildhfc. fon ('oil"...
<br />Colorado
<br />AndctsOll,R,M l'l9'J Aql,,,,,IIStoole. allll...1
<br />."."''''''''01 ofColonldo p'kemlnnow larval
<br />pr"duel"''' In tt.; GU"IlIS<11'1 and Colorodo
<br />li".....,Coloradol<;l92.1'I"}(, flnalRepon
<br />Coln...doO"."ionofWlldltfe.Grnnd JUIl<:'
<br />lion
<br />FlaIge... K R" R. T 11.1011'1, and M. A. Ttan""d
<br />1'191\ [)ocn.,n51team 1r.IIl'pon "'Color...."
<br />"'lL"''''''Sh1af".lCIII Ih<:Gra:nRi'l:rdl'l'IIl"g.
<br />Icmror:dartd'p"IIlI,'.naUOflinabundancc
<br />artdrdallonsh;p'''''hJuv.llIlerccrmlrncnl
<br />F1nalReporl Col"l3doSweUnlve,..ty.FOrl
<br />Colh",
<br />IlLlCk. T.. artdR. Y !lulU.". 1'hI~. (1.......11'11:".
<br />"'~'''''rhngrolor'''''''''lI"'...ll'hald,lT=n1
<br />"'''lerl<:rnpcr.llures So,,'h"'ClilemNarurah..
<br />.10 Hl_H1
<br />Black. T. and II. II Bulkl.,. 11>~~b Preferred
<br />l<rnllC~.llureofl.....lr"~CoIoudoSq".."r,!h
<br />SolllhweSlernNalu...h.. '0.9~.IOO
<br />Ara"dl. S. 8" and J Kindl 199), Spallall~
<br />e'plicil modcl.ofslripcdttassgm,,'h polen-
<br />1IaIinC~pca~e8a)' Trno"'lc1lonsoflh<:
<br />Arner","n Fi,her,,~. !'..>eicr,. In MH.Jlf,'J
<br />!lu!dick. B. D 19'J~ A plan to cv:oJuate """k"'~
<br />lo""gmentorm!o"'lV.Orbac~su.icrinlhe
<br />uppcICok,......oR"-.:r f,naIR.porl. U. S
<br />fi.h and WlldlLfe Se".ioe. Grdnd IUIICllon,
<br />Colorado
<br />Ch"n. T, E.. D P Svendson. and 1.., I.,,",>\(II
<br />19<19 tn'l:M'!:,"ionofpot",,"alra/crbac"
<br />"lCker (.rmruch~n 'U,,~ltJ) and Cnlorado
<br />pike""on<>w(Pryt-hoch"I.,lttclu.<J<Jl'I,,'o'"g
<br />in IIoelo>o.e, G_n RI""', 1m and 199~
<br />f",..IRcJlorl. UrahD""S1o"ofW,WlifeRe_
<br />sources.Moab.U'.1h
<br />
<br />IJ
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