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Last modified
1/26/2010 3:16:33 PM
Creation date
10/12/2006 4:48:50 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.10
Description
Colorado River-Water Projects-Glen Canyon Dam/Lake Powel-Glen Canyon Adaptive Management
Basin
Colorado Mainstem
Water Division
5
Date
1/1/2002
Author
Webb-Melis-Valdez
Title
Observation of Environmental Change in Grand Canyon Arizona
Water Supply Pro - Doc Type
Report/Study
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<br />8A\a94 <br /> <br />Year <br /> <br />FISHES <br /> <br />Year <br /> <br />Predators <br /> <br />Insectivores <br /> <br />Benthic Omnivores <br /> <br />195 <br /> <br />0 1 <br />0 <br /> ~ ~ <br /> 0 <br /> c .c ~ 0< ~ <br /> .c u <br /> c .c ~ '" 0< ~ <br /> 'E ~ -" u u ~ 0< <br /> ~ -" ~ u <br /> '" -" u u "tl ~ -" ~ <br /> u ~ '5 ~ <br /> 0< ';ij u "tl 0< "tl <br /> '15. ';ij ~ '" u 0 ~ <br /> -0 .c "" ~ E <br /> 0 >. Cl. .c '" <br /> "tl C C U (; 0; -" <br /> ~ ~ E '" '" <br /> (; 0 0 ~ Cl. N C ~ <br /> <0 '" '" ~ c <D <br /> "0 I '" ~ <br /> U u:: <br />0 <br />0 / <br /> / V ~ <br /> '5 \\ ~ Cl. <br /> -" '5 ~ :0 <br /> ~ <br /> '5 g g 0 U <br /> C <br /> ~ C C <br /> U ~ E <br /> 0; 0 ~ <br /> c .c 0 "tl <br /> C c 05 ~ <br /> ~ ';ij '" <br /> -" '" -S / <br /> u ~ <br /> ~ <br />0 / I " Green '\ Mosquitofish <br /> Black Brook/ <br /> bullhead Striped sunfish trout / <br /> <br />BOO <br /> <br />180 <br /> <br />185 <br /> <br />1850 <br /> <br />190 <br /> <br />1900 <br /> <br />Hoover <br />Dam <br /> <br />1950 <br /> <br />Glen <br />Canyon <br />Dam <br /> <br />I' <br /> <br />200 <br /> <br />2000 <br /> <br />I <br />. <br /> <br />bass <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 Ihe initial 1 BOO population ot 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evenly distributed(R.A. Valdez, unpublished data, 2002).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 />
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