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<br />~~~5-92 FRI 15:05 <br /> <br />- , <br /> <br />, <br /> <br />P:il3 <br /> <br />. <br /> <br />f;" <br /> <br />, ,- <br />l,j I <br /> <br />I IrlTHODUCTrON <br /> <br />Thb 3upple!lll:l1lt. will addr~s.s the issue: "''hat is the relation.<;hip between <br />streaZlflows anJ eccsystCi!l he3.lth, especially th;:lt of rlpar!an vcg'3tatlnn? <br />titeratul"e froM thr'ee geographic regions was reviewed In order t.o prep.lrc t.his <br />3upple:nent. The t'eglon~ I;I.re (1) the eastern Sie"ra Nevad;i of Cali fOf'nla. (2) <br />the southwe~tern U.S., and (3) Scandinavia, especially Sweden. <br /> <br />Ecosystei:! health, for the purposes of thi3 pa;:3er, Is the ability of the <br />ecosystel'J to I'lalnt.aln its structural and ~hysiolog!cal character through time <br />and space. This does not. Infer a static vegetatIve state, In which the <br />riparian characteristics renaln fixed. In fact, Just the opposite is required <br />to preserve the riparian ecosy~tem. The normaL processes of survival, <br />regeneration, and growth of indivldual~1 species, and con~unltles must exist in <br />varying proportions across tlCle and space. The resultant dynamic equilibrium <br />maintains the resiliency of tr.e ecosystem, and therefore its health. <br /> <br />CAS. STUDIES <br /> <br />Eastern Sierra Nevada <br /> <br />StUdies In the eastern Sterra Nevada of southern Cal!forr.ia documented several <br />comparisons between species located both abolle and bele\.' divc-rsions. <br />Morphological cor:tparisons (individ~al leaf area, leaf area/branch length, and <br />specif1c leaf mass) were !:lade for three woody, riparian-dependent species <br />(wa~e:' birch, black cottonWOOd, and F'rernont cottonwood), including twCl life <br />stages (adult and juvenile), at two sites on Bishop Creek. Of the eighteen <br />compartsons done, sixteen shOlled stattstlcally significant impacts to riparian <br />vegetation caused by dlversion operations (Smith et al. 1989). <br /> <br />In the san.; study the differences tetween leaf surface and a~:" ter.1perat.ures <br />were st.atistically sig'1ifi.:oi'l.ntly greater at high-flew si~es ;.;~e:1 ccr.:pared with <br />lcw-floW' 5i';e5. Le3f surface temperatures are crl~ical t,J the effiCiency of <br />the photCrsynth.:!sis p:"oces!l: a~nve a certain thresh.;:ld l~c h'arncr the leaf <br />te::lpen.tiJre, ~h€ 10::55 phol:..Jsy:'H.h>:,sis tt'l.H. t.:l.kes jjla~e. At extrE:1e tenjJeratures <br />leaf d:l.r.:ase and mortd:'ity ....a'l i"".,:cu!'". !ran.::.pirat.ic:1 is thp. cocling process by <br />which ~oist..Jr't' is tl"arJ$pire1 fr';,~ :ne so: I I, thro'':'f;h the plant, and ou: ~tomatal <br />openir.g.s In tht! 1"'-.1f. ;:; the rl,.-.l.:...jr..,. evapc.:"..itC.3 fr-:J"l tr:e Ip.f.:- sur!'ace. the <br />leaf ::'31,~:"i31 Is :"C;"lt 'c,}!. CH"H.l5~ !',,~l .'i..Cltstu:"e ~s I,.ls\..,lllj more available, <br />