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<br /> <br /> <br />Figure 50 Sonoran chublcharailto <br />sonorense, 12.7 em In tOlallength, <br />lrom Its only locality 01 occurrence <br />In the Unlled States in Sycamore <br />(or Bear) Canyon, Anzona: II IS <br />listed as threatened <br /> <br />heJ,Jwaters of essentially JII the mJ.jor tributaries to <br />the Gila Rivt'"t. It is bewmmg rare. especi,dly where <br />land use pr,lctJces such .is overgralln,l.! lead to <br />incision of tloodplams and 1{H-\..erlng of w.uer tables. <br />which. in turn. drain marshlands Jnd other strt.am. <br />assoCIated h.lbitats. <br />Sonoran chub (Fit:. 50) scarcely r-nters the United <br />StJtes In a sin,de stream that dr.ilm southward <br />across the Internatlonoll boundary. It IS Widespread <br />in the small Rio Concepcion baSin In ~fl:xlco. \\?hen <br />In breeding c{mdltlon. it IS one of the most brightly <br />colored species of chubs, with Inten\e red I)n rhe <br />brs. {IPC'rcles. tIn bases, and belly It OCCUPll'S erosiH~ <br />(tC'eks, sometimes livlOg under se\.ere Intermittent <br />conditions 10 remnJot pools under cbffs. It seems <br />more omOl\'{lTilUS than other chubs. feeding <br />exu'oslvely tln .llgae H well as Invertebrates. This <br />apparent orrorrunlsm mJ}' reloHe mort'" (0 tht'" s.evere <br />hablLH than [0 J.ny baSIC preference-anything tends. <br />to be caten wht'n prO\'lSlons .He scaHC. <br />Orht'r, Sfwcial Fi5ht,~.- Two speci<il groups of tlsht.s. <br />puptlsht'"s and ropmlOnows. are disttlbuted In pan In <br />streams of Inrermed..He elevati\m In the Colorado <br />and Yaqui sysa'ms. Alth{lugh both chest. ,~fl)UrS are <br />often thought of as "desert fishes'. InhJ.bltln,l! lsolJted <br />springs. neith('r IS exclusl\'e1y so. Puptlshts are <br />especially misrepresented In this ret'.Hd. In (.1.([, b{)[h <br />groups are quite commonly reprt'\eoteJ along <br />margins of ..m.dl en lJ.rge stre,lms In habitAts well <br />.Ibove the dr-sere tloor. The orlglnal e1t"1"arion.1.1 rJnge <br />of desert purfish"hhr,n-;t!l .{t! dtsUrt6 (Fi.c 51) In the <br />ColouJo basm was from well helow sea le\'el In tht, <br />Salton Sea :Irea [0 Jt least 1';00 m ele\"atlon In the <br />upper S.ln Pt.dro Rl\'t:r of Sonora. In ~I(-xi(o, the <br />undescribed. whltelln pupflsh/,Jd'(>rrl/o .1it/d /;/:111>'0 <br /> <br />"'-" <br /> <br />tf.- ':' <br />. . <br />.j',:,' <br />. <br /> <br /> <br />Figure 51. Male (above) and female (belOW) dessn puplishl <br />caehomto del desierto. 46 and 35 mm In tolal lenglh, <br />respectively. lrom Estuano de Santa Clara, Sonora This <br />endangered species is now restriCled to three small, natural <br />localities In the UMed Slales, and about the same number <br />of sites on the Colorado River delta In Mexico. <br /> <br /> <br />25 <br /> <br />01105 <br />