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<br />TilE \\"\S:\I:\~~ JOl'R~,\1. OF 1l101.()(;Y. \',,1.. .\4, ,-"
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<br />The contrihulion of allonll'lric" to ,'ariahility in morl'h,,: Ii, -
<br />\\"as examined firs\. :'\l'xl. all morphometric dala from ,t' ,I,!.
<br />"amples of C;iltl from Ihl' l\\'o major draillagl'''. Ih,' Bill"
<br />and l;ila riYl'rs, \\"l're suhjl'ctl'd to a standard test of aiL.; II:
<br />,'arianrl' to determine if significanl diffl'renn's (I' < O.!...'I,'
<br />prl':'l'nt. \'ari:llioll in IlllllPhology hl'lIH'en :--ampks in I II I"
<br />draina!.:l's \\"as quite hi!!h. In order 10 identify sources oi ':1: :'"11
<br />and finally to determine their geographic relations a nu: ":
<br />arhitrary grollpin!!s \\"l'rl' Ihl'n tested, hOlh \\"ith analY:'I':" :\1:.
<br />anc,' and l'lllpirically. Conseqlll'nlly. fislll's \\"l'rl' str:lli,.:,., ,I.,
<br />cording to suh-hasins \\"ithin the C;il:t and Bill \\'illianl:' dl:::!',I~t'-
<br />and inlo mainstream \"l'r:'lh trihulary \\"all'rs. high \"l'r,SII" !"',' "II
<br />1\lC11' rl'aChl'S of stn'ams and ~"('ar ,"('rsus ~Tar (oi colll'Cli"ll ,111\
<br />plt-s irom Ihl' middh' ('o)..rado Ri\"l'r \\TI"(' sllh.sl'qul'ntly ".. ',,/0'';
<br />O\\'l11g to thl'ir apparl'llt similaritib 10 prohl.-malic PO\,\::,-,' 1"11-
<br />in northern portions of Ihl' :'llIdy area along Ihl' :\Iogolloll \,ill:
<br />(iig. I)). Fi:,lll's oi lhe genus (;illl irom rin'Co ha.sins in n..nh.'rn
<br />:\!l'xico \\"l'n' also I'Xamilll'd and compared principally 10'111111""-
<br />irom tl1l' (;ib Rin'r hasin in soullH'rn ,\rizona.
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<br />(',.\TTEl{\:S OF \',\I(L\T!II\:
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<br />I'n.s:,ihh. inihll'Ill"l'S oi allollll'lrirgro\\"lh on ,.:tlidilY of Ill,,:.-ur,'.
<br />1l1l'nl" \\"l'n' examined using :'lwcillll'll:' oi (;, il/lallll'dill irollt \Ifill
<br />key ~prin!!,s. a :'oullll'rn Irihul:lry oi tIll' :-;anla ('ruz Ri\'I'r I ii~
<br />I), and of (;. r. rllllllS/1I irom lhl' maill"lr.'am oi 11ll' :-;:tl: !'.in'r
<br />(fi.gs, 2 -,), Thl' :-':111 Rin'r iorm rl':lrlll's II far !!n':lll'r sil . h:1I1
<br />do iislH''' III 11h' population il'llll1 \lonkl'Y Sprillgs as lh, ,"I...r
<br />rangl' of daLI indi,':IIl'S. :'\01.' also lh:1l no specimens 1.--- "':11'
<br />-10 111111 .slalldard ),'Il:.:lh (~\.) \\'l'I't' ayailah]e irolll lhl' :-'alt I~.i\..'r
<br />\\"ilhin the size r:llh.:e of ~pl'cimI'IIS IIsl'd illr mil rphll 11 It' I ri, ,"111'
<br />pari"ons. usually hl'l\\'C'l'n 70 and 200 mill S\.. simil:tr all, '\,dril
<br />tn'lIds an' 1,,'idl'lIl in tht, two popul:ililllls (ahholl:.:h ;1l'l1l;!1 1111'-
<br />difft'r lIIarkl'dly). The populalion frolll :\llIlIkl'y :-'prillgs i., r. 1::i1'\;'
<br />allly ,'ariall!" ill lilt' 1"1l!!lh of head alld "f caud;d pl'dullck (I: 21.
<br />more so th:tn ill "tlll'r populatillns sllldil'd, Silllil:irly. ,'ari:I' : 111
<br />length of caudal !,<,duncll' in thl' :-'ah Rin'r popul:itilln \\";1 ,~h
<br />TIll' possihility Ilut meristic fl'aturl's yaril'd with siz.' a]" ,.1:1,
<br />('xa mi lied. hu I no :,uch I rl'nd., Wl'rl' I'\'idl'nl.
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<br />Furtht'r ddinitioll oi il11rapopulation ,'ariahilit,. was made by
<br />Illrrislic alld 1Il0rphological compari:'oll oi samplc~ from the same
<br />place. hut irolll difi"l'l'lIt Years. III Sl'ril'S of sam!,!es when' adl'-
<br />qllatt' m:lle'rial i.s a\';lilal,I.' ""l'r a l'l,Llli\'('ly 11IIIg period of time
<br />(c.g. East \"l'rdl' Rin'r. :\Ionkey Sprillgs, (':In' ('rel'k. \\'l'l Beaver
<br />Cn~ek. alld thl' (;ila Ri"l'r hl"adll.aters; tallle I)' m:lrkl"d slalJilit,.
<br />through lillll' IS indic:lll't1. Further, a skl'tch h~' Johll :\Iix :-'tallle;'
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<br />:l1)al;l ull 1I11..-j.lk... alld Illllrphllllll"lril-"' III ....alllp"... IIi I:il" irolll ..pt'l'iik 11Il;dilil'" in Ih('
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<br />lowc'f ('..I"catlo I~i\l'r ha....in 101.. .-'h'lI...ivl' 10 Jlulili:-h art' ulHilill:l!'lt' irlllH Ihl' 1'llit'Jr. \LI....IlI;IIH1
<br />Journ;tl 01 Bi,dp1!Y.
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