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+ •~ <br />--- ~ <br />504 <br />S.M. NELSON AND D.C. ANDERSEN <br />US Geological Survey 1964. `Compilation of records of surface waters of the United States, October 1950 to September 1960. Part <br />9. Colorado River Basin', Geological Survey Water-Supply Paper 1733. United States Government Printing Office, Washington, <br />DC. <br />US Geological Survey 1970. `Surface water supply of the United States 1961-65. Part 9. Colorado River Basin. Volume 1. Colorado <br />River Basin above Green River', Geological Survey Water-Supply Paper 1924. United States Government Printing Office, <br />Washington, D.C. <br />Ward, J.V. and Stanford, J.A. 1995. `Ecological connectivity in alluvial river ecosystems and its disruption by flow regulation', <br />Regul. Rivers: Res. Manag., 11, 105-119. <br />Warren, M.S. 1985. `The influence of shade on butterfly numbers in woodland rides, with special reference to the wood white <br />Leptidea sinapis', Biol. Conserv., 33; 147-164. <br />Weiss, S.B. and Murphy, D.D. 1990. `Thermal microenvironments and the restoration of rare butterfly habitat', in Berger, J.J. (Ed J, <br />Environmental Restoration Science and Strategies for Restoring the Earth. Island Press, Washington, DC: <br />Zar, J.H. 1984. Biostatistical Analysis, 2nd edn: Prentice-Hall, Inc., New Jersey. <br />J <br />_. '~~}F itv~fi ,~.ito _ <br />. ~ _a,i _.., z._ - 1 i:C -~ ,. <br />;. .. _ :, . _ ,.;ir1-Lial ~t.~i~ .~a~t~i'twu:'d-~ t~~~sN4~-J ..-44%~.:il ,.4+ ^* py+-fir ~.;. .~•~ _ ,. . <br />;r_ Sc~ ~ ..,;`; .'~aiti~ - tt~3 '91tt 3 ~ _anv) F396`•7~ 9~S ., 's~i[iC-lP:.y, 7~.S.9Lift>[!t ja~_~ ~'-a 5a~ ~. .~ nA' _Ri~l .ils~'iiltTa;~ <br />`,~ it`tr~^a4';ur!tt~l s ~ y n~ <br />t d sr•3 ~c:~a1.n..?i3rlr~ ~~: - ~<s~.+~~5~t ~a4 .~:.i .Q,.?1 .ils~i~ <br />.. ~ 1 ~.,.. ~r, +,.,~hivc,ar~ Itrst r~;rth- ri ~ t~,ti~. t;a _, ~ <br />~ ,< <~^n r~ ,u,''r ~ ~,~ ,, .,ul` .£;# ? .~~.~ ;d:.id~:i3 bn,, .~.P, r,a~r::,;l . t1 l1 .vE~~~~s1at <br />k <br />~1-v; _: i~9 tfd ~ ,JIt7p23~`i ~"'3rX ?F~3; :[ t_%,.' ~::~ iF S(]1G'R 'V `(i~id19'l(~ V~~Jtd)t~ ,r 'Vi'i ,{ ` J~-t,ir~~. 1}F~'b" ,fj (f ifl 'Jt~ <br />. ~,. t.;..~.~. le ', :-jai ~ ~i*ti4 ,. SE_"": ~ •..,. ~~)_~ ~~'z~ :[.d.,e~± ., ~,~.3~ .;.a E,~.. F"Si ..~ Ctf-_i,~i~~.n ~ <br />v. <br />- ~. .,,.. t,. <br />- ~ k I <br />i ,. ~ ~ ~~ <br />_ .. ~ ~. <br />Copyright ©1999-John Wiley`& Sons, Ltd. <br />Regul. Rivers:.Res..- Mgmt. 15: 485-504 (1999) , <br />