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<br />'l~:,._ ...1.-.:92 !JE~ g. 10 <br /> <br />P,04 <br /> <br />f'" H;~ <br /> <br />espe-.:ially 1n thE l:;"t',~(' par't.s cf l.he grow1ng season, on und1vertcd reaChes, It. <br />is presu~cd that the increa~~ in evarorative cooling (tl~n3plratlon) is <br />res;:IOf:stble fOl' t.!l'; ip~r'ease;l te~p(:r.~t.ur~ d1rfef'er.c~s. <br /> <br />Vapor' pressure 11 (ferenc~ 1:S: (1.1') IMicd.tor of the .O:ci.5turt: "tr'e3S th&t a plant <br />is ~xper1encing. Plant.s at low-flow sites developed lower vapor pressure <br />differences. i.e" higher noisture stres...,. in a1d- to late sunncr', whIle no <br />such r~sponse was evident on undl'v'erted r'eache:s (Smith et. al. 1991). Juvenl1e <br />plants are likely nore prone to ~orta}ity at low levels of water potential. <br /> <br />Er.vironr.t<lntal isotupe <lnalys!$ of deul:.er1lJm concentrations led Smith et al. <br />(1991) t-., I:;llfZR"ir. t.h"l-: tht";.se three woody sp~cies lJtUized soil water in sprln6. <br />~urface hater 1n su~rr,er after the soils dried out and w!1lle st.reamflow was <br />still hIgh, and gr:)'..lnJwatel' in fall after' surface flow.') subsid'3d and soil <br />colstu~e was virtu~lly ~b5ent. <br /> <br />The effect of all ~he$~ changet-; Is ~h3t ph.nt-s on diverted sites a.re more apt <br />to be pushed to the li~its ~f their wat~r str9ss tolerance. Irr.:13ture life <br />stagc-.<; a:'e likely to r.'."'t surviv,l mder these artificia.1. ext!"ena conditions <br />(Penner et '31. 1935;', The pruba~le net res'.llt \Jill be changes in the r-iparhn <br />community in term,,; of e;(tr;nl dnd/or structcr~. Smith et. al. (1991) conclude <br />"trat the lnl-egrit}' of rltJ2rhn conrnunit!es is in Jeopar'dy as a result of <br />str8!?1I' civers1"n." <br /> <br />Tht' effe~ts of st.:"e.l"lfJow divers10n on cot tor-wood e.:"Ow':.h ral:.es 1n Bishop Creek <br />h3.....e a~s., t'~en ~t.u.ji,:.d, Regres~ion equation.'5 predicting dianeter growtn of two <br />ccttlJrwoo::l speC1es \oIere developed frOM environmental aLtributes. The codels <br />expl'l.ir:ed 74% or ~oC'e of the annual varla~.:e in dia'"ieter grol.th rates, with <br />gro...!r.~ so<;-?-soo n~~w 'w'Olur:-:-, p~-€',1cu~ ye;;.:"'s r'ing Ioiidl:t, and av~rage r.taxinun <br />~!"C;.IL~~ season tC;'ir('('i--.rure - - :n o!'der ~f s:g:lit'icance (Strc:r.tc.:"g a!1d Patten <br />199U ;:,;.,j i9,,1). ,Xi'H gN;.-I;.!-l p.lf~;'1"-~€'r~ .1r~ f~clol r~lat.ed. sue:-: 3S the vig'Jr or <br />r.e~:tt ~: ~he ~~~Q~J. <br /> <br />~ai~r;€n~:'ir.'e ~t:-,;:.:~"l,:~.... <br /> <br />i~ tt:... <br /> <br />eX:SI:!":;; -:c:r;!":...r.itj <br /> <br />" <br />, <br /> <br />stu::)" <br /> <br />:j';i:rlt.lly <br />~1 ':"~irby <br /> <br />C'f ,",,:;t,",!' re::;'..Iired to <br /> <br />:\L:S!l Cr\~ck ::ug~e!:t.s <br /> <br />;:;alntain the <br />that a large <br /> <br />p-?-:",~.;;'1:?g~ cf :"t', (:i.~:':'1: fh... is rei'llrti'd fSI ~.t'.1:1~.e!1a:1C€ of cottonwood <br /> <br />rcr'..:'?~.:'_:1S (S~l"':-"'~.':"f ~~.~ ",--.(:"" q';J':') <br /> <br />jt,E. ::r.'F-:/ ,)t 51_shC'j) C!"eek conclude;:! <br />