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<br />TilE \\":\S:\L\"" )()('R:'\:\L OF BIOLOCY, \'01.. .\~, :'\0. I, I';
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<br />(;rcat slahility in hOldy form also CxiSIS in C. 1". ,."bllSlll, T;,
<br />suhsPI'cil's livl's in hahilats rangin.~ irulll Ihl' 1ar.~I'. warlll. slruw';
<br />ilowill~ J'hol'nix ('anal 'ys\('m (';OJ III aluJ\'I' I11l'an '1':1 Il'n,l) Ihr",
<br />Ihl' lurbult'nl Salt Rin'r III 1/11' cold hi.~h-,~rarlil'nl \\"hill' and HI:,
<br />rin'rs (2.500 ml. It al"o is prl'"ent in small. pllol-riiill', lll\r-gradi,
<br />IribulalT nl'I'!;.s. In 1111' Bill \\"illial11s dr:lina~(' spl'cillll'ns oi (;
<br />1'11/111.\111' han' Ill'l'n Llkl'n irom Illarshy creeks oi 11ll" 1ll":llhr:ll,
<br />and in pool-riiih-s iurtlll'r downstn'alll.
<br />Thl' prl'dolllin:lIltly sout/1I'1"I1 G. il//alll/'llill IS 1':11'1' in the (,;'
<br />Ri\'l'r s\',II'n1. In tht' soull1l'l"I1 portion oi its ran~l' thl' hal,it:L'
<br />oi Ihis ii.,h an' princil,:dly lelllie. in lllar,Ill"', l,roc:k." or in illlpOlll1'
<br />11\1'nls. 'I'll Ihl' north il is iounrl in till' n.1ali\'dy 1ar~t' San (':IIL,
<br />Rin'r, iri rork IHuIIs oi Fi,h ('n'ek ('anyon, aiHI in pool-liii'
<br />in ('an' ('red:. ()Ilt" pOIJlIl:tlillll li\'l's in an aniiici:tl h:d,ilat. L
<br />BlICkl'Yl' (':IIl:tl.
<br />Earh oi 11ll' thrl'l' iorms oi chuhs !in's in a diiil'n'nl placl' al1ll
<br />hl'nu' Iht'\' arl' l'ssl'nli:dh' allop:lllil". YI'I thl' h:d,itats oi l'arh rOIII.
<br />prisl' a s"ll'rtrtnn ir0l11 iar~l' rin'rs 10 small sln'allls, from low I"
<br />hi~h dl'\'atilln, and irolll rl'l:tli\'I' swiit anrl turhult'nt to SI'I1,j.
<br />lentil' rondilions. "I'llldatilln., of C;. il//./"II//'Ilill prl'in quid W:II,
<br />:t1lhllll~h 1I11'Y lin' ,urn',siully and n'l:lin their identity in III,
<br />l:tr:;:l' :-ian ('ados Rin'r :Ind in tIll' HlIlkt.yl' C:ln:tl. The [1111:1.-
<br />Ili (;. /'11/111.1/11, on Ihe otlll"r h:lIld, inhahit :dlllosl all kinds oi habiLl1",
<br />:lIld n'lllail1 iairly uniillrlll in mlllpholll~y n\'t'r hro:lrI ~l'o~raphil'
<br />are:ls. ~o hahit:lt pn'il'rt'nu' is appan'nl for tlll"s(' animal.,. \
<br />sli~hl In'nd Inward thicker Iuulil's and rl'durti'J!1 oi nll'ristic II ,
<br />lun', in populatiolb oi lhl' uppn trilJlII:lrit,s oi tIll' S:t1t Ri\"l'r I:,
<br />r. /'11/111\/(1) and oi i111' (;ila Ri\"l'r ((;, /'. ~:/'tI//11l1/i). 1l1:IY hI' aliI""
<br />typir I't'SP"Il"I', III' illl,'r~r:ld:ltillll IJI"tWl'I'1l 11ll' ,ld"I'ITil": it i., II"!
<br />"i a ma!.!llitudt' Ih:1I "",rllrl'S disliIlCllll'"'' oi thl' taxa. II i, hi~hi'
<br />ulllikl,l\' Ihal morpl\l.III~il'al slahility IIf t'colypt'." wlluld pl't'vail
<br />IIH' alli'mats WI'J'l' a., pl:lstir as t'cotypic J'l'SP"IlSI'S pl"l'sull1al>ly rl'qui ,',
<br />
<br />.\('("1\':\'1''' Ill' ~I'L("II.S .\:\11 :-;\'J!SI'ltlb
<br />
<br />..\11 lill.r:llurl' IIIl th,. "(;illl /'0/1/1.1/11 clllllpte:.:" thaI II.as a\':libIJl"
<br />citl'd in Ihl' illl\lIwill~ account." Rl'cenl puhlicatiolls a 1'1' inrlud
<br />only ii thl'Y rl'il'r to fish irlllll II1\' IlIwI'I' ('olllrado ({in'r b:t.,
<br />Iwlll\\" Lakl' ~It':\d (ii\!, 1). ('lllllparislln, lli l'I'itir:11 d\:\fach'rs ,,'
<br />gi\"l'1l ill tl\l' key.
<br />
<br />C\'I'RI:'\1D F1SIlE~-RI:'\"E
<br />
<br />o .
<br />.0>
<br />
<br />KEY TO SPECIES OF GlI..1
<br />
<br />la. Booll' '1I"';1I11Iill"oI; .-kull oI"pl'''.-.-I'd 011 0101'-11111. al'..hilll-: smoothl~ illlo a
<br />p....dol',,, I hump ill b,.C'.. adult.- '1'01;" IlUllliJn 01 l'nl"'lt':Il' (illdudirl!!
<br />nUl' t1rl:,..:.t 'hr;u' :llId iour in rhl' \\"l,IIer'. ..llu....) .17 _"'
<br />Cauol;" p..dulld,' Ihill, (wlH."il-lik,.. l..lIl-:lh 01 cauda' p,'dUIlr!I' !..1Ie'lh 01
<br />1"':,01 1.0 or J.!1'l';lln, ~C'lh 01 h,'"d (L'Plh of raud:" ill"dullck u,u;dly
<br />......::;.0 Ill' ~n';llt.r. ~qll:tlll:llioll oih'n illtomplt'h', wil II ~t':t1~ ," ;th="l'llI or
<br />hiJ.!I"-, ..mlll'd,!..oI Oil PI'..dO"UIll, n'nln, "nd ..aud"J p,'dunrlt-, FillS
<br />1a1'J.!" and I;dc,,,", nri;:in 01 do,-al lill .warn to lip 01 ,noul Ihall to
<br />":IlIo1;" fin,l,a,1'. I lors.d fin-ra~, "llllost always lOur mol"'; 0111011 fill-
<br />ra,' , u,u;dl, 10 . '_._(;!i~i';I;;gal/:' Bai~~i-:II;;i--(;.ir:1I'I1
<br />II,lT.;i.;:-I-f,i,'k-.-Tiiif-oril'iou_l~ .'1 "':lIl1lio,'d; skull ,liJ.!IIII.,. d,.p",,,,,'d 0, l'oUl"kd
<br />IIn do,-ulll. p,,'dol',;II hump ;11 ,,,.II t, Or il pn',,'ol. 1:111' and ,i-ill'!
<br />al.rUI'I" :01 Ih,. n;II"'. Tot:ol numl...r 01 n..-td',:oe ,\S-.II).' C:ourlal 1'1'_
<br />r1unde ,horl, IIIilk, an<l "i,k, 1,'nJ.!lll 01 clu,bl pl'<luocl.. knJ.!th 01
<br />h,.;,,1 I..,,, !Iun 10: kllJ.!lh 01. h..;,,1 d..pth 01 clud;d Jwdun..". 5.0 or
<br />I"" (u'u,dl.,. 1..-_ th:1Il ,1.0'. ~'1uamatioo ..umpll"le. Fins ,;m;III. rlluo,k<l;
<br />ori;:in 01 do,-;II lin ''''''1'1'1' 10 clud;d lill-I.:os.. th;1I1 lip 01 ,;Oout. (Jo,,;II
<br />an<l "Ilal lio-,:"._ I) or Il'l\'i'r (",'ry 1':01'.-1)' 10)
<br />la,lIod)' ..hul.l.)', ,brk in coloralioll. S..a!.-,; l:org.., thi..k, ,,"d I.I'0ad". im-
<br />l.,iclll': I.:o",d LIllii u,;u:III.,' prl',;,'nl 1.:1I1'1',II-lill" seal..s almo,;t ;;I\,.a,.s
<br />fnn'r thall so. I lor-,ll lin-'a~',; u.,uall,'. S (ra,d)' i or f)); all;II li;l-
<br />L'YS S (rar..I~' i); Iwld.. lin-ra~' S or 'I. I.ellgth 01 hl':od d,'plh 01
<br />c:ou,LoI p,'duod.. u-u;III' 3.0 Or k',;. :\11 "I.rupt. l"Il~', ou..II:d hump
<br />dl'\'dllp", in 1;1t'~\.. l\'I\\;\k:-o oi ~t)lr'n' pDpul:llillll.";, Tot:d Ilurlllwr oj \-er-
<br />Id,ra,' .\S-.~; Gila illl('nl//'di" (;ir:1I'I1
<br />h. lIod~' Ihi..k. I.ul 001 ,IIul.l,.,.. liC'hl to mOIl!.-,1 coloration. Sra"',; ,;null,
<br />IIIin, ;111<1 .,Ii:.:lltl,' iml.,i,.ak; I",'al radii al.'l'I1I to In'akl.- d",.,'lop,.<I
<br />I.:Ih-ral-line ,;cll..,; u-u,dl,' mol',' IIIan so I G. r. grahalll; l"IIl;:,., :0, I""
<br />as i51. D()I',;:II lill-LI)''; 'l, anal lin-ra~s nllhlly 'J (G. r, grahl/llli h:._
<br />S or ')). p,'''i.. I.ill-I'a~.,; u.-uall)' 'J. I.,'ol-:tll 01 head d,'pt!! or' eaud;II
<br />p,.dundl' u.-u:II". .,.0 or mo,.., Fall~. nurh:ol hump r:OI'l'I~. dl'l'I.lop,'d.
<br />,11,,1 ii 1",,-,'111. ,r"....-I~ di-"l'I'nill"'. ToLd oUIllI.,.r 01 nTh-I.,:o,'. .1\. -PI
<br />Gi/I/ /'01'//\11/ Bai,<I :lIld (;iL,r"
<br />
<br />Gila clcgans Baird :lnd (;irartl. Honylail chub.
<br />
<br />Thou,~h onC{' wid('sprt'ad in Ihl' Colorado Ri\"t'r basin. (his spe-
<br />Cil'S is nOlI' l'ssl'ntially rt'strictl'd \.. Ihal portioll of thl' draina,~t'
<br />ahllvt'Lakl' :\loh;I\'(' (Holdl'n and St:llnakn, 1975 l. II is {'xtinct
<br />in thl' Cil:t Rin'r Sy.'Il"111 (fi.~. 7.-\), I.ill'ralure rl'cords art' i/'l)111
<br />the mouth oi Ihl' (;ila Rivl'r 10 Fori Thomas on thl' mainSlrl'am
<br />(Kirsch. ISS9). This record may Ill' qUl'~('ionabll', especially if
<br />!la,'l'd lln sma 1\ spl'ci n\('ns. ~ l'\'l'rt 11I'1l'ss, 0\ her .. bi ~-ri \"l'r fishl's"
<br />such as lilt' squ:lwiish (/'/y'-!III,-!,/'ilus l/It'ius (;irard) and hUlllpback
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