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17. . . . c: (u;il) tratioDa of ..1.aiuI ar. pr...at in aquatic ....iro_u (tellly aDd Saith, US7). Dead.1Id d.forMCI organil.. do aot per.ilt ia tbl .avirODalat II they ar. food lourc.. for aaay leav.nger.. Benc., oba.rvaUon of .ick or defomed iadividuI1I r.quir.. a conc.atrated .ffort for d.t.ction. In vat.rbird., Al.~._itl.. typically involve .i..ing .y.., curl.d lov.r b.ak., .bortea.d l.g. oft.n vith no clav., and .x.nce- pbaly (lnC01lPl.t.ly foraed braincaHI. Th... t~'of ..for.iti.. v.r. .110- ciated-witb IIlea1ua CODCIDtrltion.-ar 19-130 .icrogr... par gra. (ug/g dTy .eight) ia livers of birds fro. Ke- .t.r.oa RWR (Ohl.ndorf and others, 1986). Conc.ntrations of s.l.nium in the drain vat.r which enters Kelterson RWR frol 85,000 .cres ranged from 140 to 1,400 ug/L (Pr....r and Ohl.ndorf. 1987). A large nu.ber of species of vaterbird. have been collected from the middle Green River ar.a during the pr..eat .tudy but not all species are present at all sites. It is, there- fore, difficult to compare tissue data from different species among sites. In addition. most birds are very mobile when feeding. utilizing both contaminated and non-contaminated sites. American coots ('ulica aaeri- eana), while not important game birds. are somewhat ubiquitous. not very mobile, and are useful indieators of contamination at most sites. Summary data for coneentrations of selenium in coot livers from the middle Green River area are shown in figure 6. Deformed eoot eabryos and eggs con- taining selenium concentrations rang- ing from 63 to 120 ug/g dry weight (6.5 to 15 ug/g wet weight) have been found in a section of Ouray NWR. Studies done on mallard ducks (Anas platgrbgneboo) by Heinz and others H987, 1988) sbowed that reprOductive impairment may be possible when wet- weight eoneentrations of selenium in I9gs exceeds 1 ug/g. At 5 ug/g, impairment wa. much more likely to oCcur. Sel.aiu. can cau.e .ubltantial .art.lity of fi.b I9g. aDd d.for.itie. and direct aort.lity of juvenile. and adultl. At .ubleth.l concentrationl, adver.. .ffect. .ay slovly r..ove upp.r trophie-lev.l fi.h (pr.dators) froa tbe lye tea. A .u...ry of ..l...i- ua concentr.tion. in fi.b eollected frol .ite. in the middle Gr..n River .re. is .hovn in figure 7. Pish .a.ple. fro. the middle Gre.n River gen.r.lly con.i.t.d of a co.po.ite of five vbole fi.b p.r ...ple. .nd repre..nted .speci.. of carp (Cgprinis carpio), black bull- he.ds (Ietalurus aelas), suek.rs (Catostoaus spp.), ehannel eatfish (Ietalurus pUlletatus) and green sun- filh (Lepoais eganellus). Pish saa- ples frol Stewart Lake WMA and Ouray NWR were coaposed prim.rily of carp, blaek bullheads, catfish, and very fe.. green sunfish, a predatory speeies occupying a niche similar to blue- gills. Gillespie and Baumann (1986) reported that populations of bluegills (LellOJllis aacroebirus) disappeared from ponds receiving fly ash containing large concentrations of selenium. Female bluegills produeed larvae witb abnormalities vhen the whole-body burden of selenium reacbed 25 ug/g (dry weight). Lealy (1985) found that contaaination of a power-plant reser- voir hy selenium in fly ash. whieh averaged 10 ug/L, eliminated 16 of 20 speeies of fish present prior to contamination of the water. Of the four remaining species, two were rendered sterile, but persisted as adults. and one was eliminated but managed to recolonize as sterile adults froa another reservoir. Only carp, blaek bullheads, and mosquito- fish were present throughout the study. ~he only wildlife samples col~ lected froa 1986 to 1988 in the middle Green River area (Brovns Park WMA to Desert Lake WMA) whieh bad se~enium centaaination and .howed d.formities were froa St....rt Lake liMA end a s..ll part of Ouray NWR. Dowever, data for