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<br /> <br />''l\. <br />,~ <br />< <br /> <br />, <br /> <br /> <br />Figure 75, Endangered Moapa dace. 55 mm 10 101a! length. <br />ltom the upper Moapa RIver, Nevada. <br /> <br /> <br />Figure 76 White River spnngflsh, 35 mm In total lenglh. <br />from Mormon Spring. Nevada VariOus subspeCIes 01 thiS <br />COlorful species. most of whiCh are conSidered threatened or <br />endangered. are distributed 10 springs 01 the plUVial White <br />River Valley. Nevada <br /> <br />Figure 74 Source pool 01 Mormon <br />Spring. Nevada. 1981, a major <br />habllal or White River sPrlngllsh, <br />The spring oul1low leads to an <br />extenSive bulruSh marshland <br /> <br />Desert springs ,In often Jlfflcult to S{'t" lmtll Onto <br />IS Immediately upon dlt"m. Sods surruundmg them <br />are typiC'.\lly too w.Herlog,.:ed or sOlhne to suPPOrt <br />larbl', ,n)()Jy \'t'~t:t,ltLlIn (fig_ 7.1), and hi,!:hly wlerant <br />seJF:r-l>. ,l.:fHsn. and ilthr-r hydrnphytes (or <br />h.d(lrh~.rc's) ma~. h,l'\"(- low ,!:rowlh.forms lih th,lt of <br />surroundln.~ dr-seH H}!t'tatlOn. linle erosion occurs. <br />J.nd outflows commnnlr me,wuer throu,!:b umJt.rcue. <br />sedft'.choked solu[lOn C'hannels. Bo[toms are madr- <br />up of \H,I.:.lnt(' m.lttri.lls ;loJ l1iH:culem sediments <br />t(lrmed thrllUfh chemlcdl ,l(tlOn. <br />A serit... of ~aslns In t'J,stern Nt:\"ada nuw holds ;l <br />numher uf JlsJuncr sprm,!.' systems that once fed the <br />plUVial \'\'hlt{. RI\'I;r lFI~. I). ThiS stream, which <br />flowed s'luth to enter rhe Colorado Rn.er. still <br />SUrplltts a subsl:lnn,;! tlsh (Oluna mcluding (hubs. <br />spn:kled dace, spmeJJct"s (I)ne exunn), Jnd ,I <br />mountam,sucker dearly JllH.-d to ~pt'Cles JnJ <br />popula[lOns llf fh~. I\)\\'er Color;}do River, Jlon~ with <br />.I number lIt mher kmd~ of nwre obs(ure <br />rebuonshlrs. One eXJmple \)f th{. Ltst is [he ~Ioapa <br />J;}ct' (F\~. -')l. J. sm>llJ mmnow resul([{.J [0 therm;}1 <br />ponls ,lOJ rhl:lr OU[flows of [he upper ~10;}r,1 RI'I.er, <br />ThiS Sp~''':leS IS rJrely t.l1und m \\Jter cooler to.ln ,~O <br />C. .!Od ,tpparemly preters a tr-mpt"raturt' tJn!ie of <br />,) 1 [0 5-1 C. Ie I~ dJ.sseJ as cndangt:reJ be(.Iuse ~)f <br />Irs extremely hmlft.d JlStnbutlOn. <br />The \Vhat: RI\'t"r ~prm~tlsh O\c. -6l .llso ll\es m <br />tht'rm.ll spnngs and l1uttlows of thiS s.-IOlt: system. <br />.InJ IS r-qually :is uOlque AS tht MOJ.rJ d:ice. ThiS <br />srt'Cles IS .1 near rel.HI\'t'. ~)f mt"mber. tlf a central <br />~tr-XlCJ.n famil~. l)f !In:bearm,!:: fishes h differs from <br />:\lexlc;ln species In re[.llnlnF [he pnmHI'I.e, eK!'.laYln.k: <br /> <br />38 <br />