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<br /> <br />.... . <br />.~i~:'" <br />r-;.. . f"~ <br />i- J II <br />I <br />JI <br /> <br />.\, " ~ <br />p~; <br /> <br />"'lit. . <br /> <br />Jr~ -~ <br />'1 <br /> <br />.. <br />. <br /> <br />I~ <br />,.~ <br />~r- <br />'_.~ <br />,. -"'- <br />~-'~'~.-c:...-~'" <br />.--r --"'"1 <br /> <br />. <br />,. <br /> <br />. <br /> <br />~ <br /> <br />Figure 7. Eroded bank along C1enega Creek. Arizona, 1977 <br />Mesquite, growing on the elevated terrace, forms deep roolS <br />In pursUit 01 a declining water table. Quickly replacmg <br />cottonwood-willow nparlan woodlands after channel incision. <br /> <br />eitht,[ eroded awa~' ur killt'd by dropping W3[(:-[ <br />tahles. .lnJ "olm ((inSistS mostly uf Introduced pests <br />su(h OlS sahcedar or RUSSloln olin", :-':arura] riparian <br />(ommunlTles perSISt onl\" H lsol,ued remnants, <br />.ilmost.lS CUfJOSlues. <br />:-';01 e\'!~rrWht'H' IS as bad as lUSt desnibed (Fig. <br />H). It' It wt're this p.lpef would Simply be .1 hiSTOry of <br />hablt.!.[ and sreCll:S eXrinCtLlln. Some narur.i! systems <br />ptrSlsr. espeCIally .H Intermediate elevations where <br />hum,.ns lud.k:~ II less cOHly to ..now the narur.l1 <br />Hrcams to ddivt'r wa[cr i\:J.[]\'~ fishes J.lso persist In <br />such pla(es. J.nd (ht:rem h~s on~ h.~' (0 (heir <br />com~r\"J.(lOn Orher haolr;us lun." been s~r aside by <br />~(l\"~rnmt:ntal or prJ\"a(~ conser\"atlnn groups. <br /> <br />Figure 8 The stream in Cajon Bonito, Sonora. IS one of the <br />most Intact, low-desert watercourses In the Ameflcan <br />Southwest. Photograph by D. A. Hendflckson, 1978. <br /> <br /> <br />5 <br /> <br />01093 <br />