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<br />Year <br /> <br />FISHES <br /> <br />Year <br /> <br />Predators <br /> <br />Insectivores <br /> <br />Benthic Omnivores <br /> <br />1800 <br /> <br />1800 <br /> <br />1850 1850 <br /> 3: W <br /> 0 <br /> c ..c Q; ..>:: .... <br /> ..c u OJ <br /> .S ..c ::l ::l OJ ..>:: ::l ..>:: <br /> E ::l ..r::. u u VI u <br /> ..r::. ..r::. u <0 ::l ::l <br /> OJ u "0 VI ..r::. <br /> u ..>:: ..... VI <br /> ..>:: 'r;; u "0 ..>:: ::l "0 <br /> '0.. 'r;; ..... <0 OJ U 0 <0 <br /> ..... "0 ..c ::;;: <0 E OJ <br /> 0 >. c a. u ..c ..r::. <br /> "0 c E (5 Qj <br /> <0 0 ::l OJ OJ <br /> (5 0 ::l a. N C ::l <br /> a:l 0: VI <0 C as <br /> '"6 I 0: <0 <br /> U u:: <br />1900 1900 <br /> <br /> <br /> <br />Hoover <br />Dam <br /> <br />1950 <br /> <br />1950 <br /> <br />Glen <br />Canyon <br />Dam <br /> <br />..... <br />::l <br />e <br />..... <br /> <br />e- <br /><0 <br />U <br /> <br />..r::. <br />VI <br />t;:: <br />..... <br /><0 <br />U <br />Qj <br />C <br />C <br /><0 <br />..r::. <br />U <br /> <br />3: <br />o <br />..c <br />c <br />'it; <br />0: <br /> <br />2000 <br /> <br />Black / <br />bullhead <br /> <br />I '" Green <br />Striped sunfish <br />bass <br /> <br />2000 <br /> <br />. <br /> <br />Cutthroat <br />trout <br /> <br />Plains <br />killifish <br /> <br />Figure 6. Historical changes in fish populations in the Colorado River in Grand <br />Canyon. <br /> <br />The width of the columns reflects an approximate proportion of each fish species, <br />although the initial 1800 population of native species is unknown and is depicted as <br />evenly distributed{R.A. Valdez, unpublished data, 2002). <br /> <br />SPECIFIC CHANGES OBSERVED IN GRAND CANYON 27 <br />