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WSP07128
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WSP07128
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Entry Properties
Last modified
1/26/2010 2:25:51 PM
Creation date
10/12/2006 2:06:18 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09A
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
2/13/1990
Title
Draft GCES Research Flow Plan
Water Supply Pro - Doc Type
EIS
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<br />p.~ <br /> <br />. FEB 05 . 30 ; 7: 28 <br /> <br />H.-4.~O. There is no significant relationship between the <br />behavioral activities of trout and the rate of change (ramping) <br />of daily tluctuating di~charges. <br /> <br />5. QUestion: How do discharge fluctuations. minimum <br />discharges and rates of change of fluctuating discharges affect <br />foraging success of wintering bald eagles? <br /> <br />B.-5.1. There is no significant relationship between trout <br />availability, trout access, bald eagle presence, bald eagle <br />abundance or bald eagle foraging success in the mainstream or <br />Nankoweap Creek and the magnitude of daily discharges. <br /> <br />Justification: The trout population in the mainstream <br />Colorado River near Nankoweap Creek uses Nankoweap Creek for <br />spawning. Results ot GCES Phase I showed that there is <br />little downstream migration of stocked trout from the Lee's <br />Ferry reach. Therefore, maintenance of the trout population <br />in Grand canyon is dependent largely upon natural <br />reproduction. These trout use Nankoweap Creek and other <br />tributaries extensively for reproduction. This trout <br />population is a primary foraging resource for the <br />overwintering bald eagle population near Nankoweap. Flows <br />resulting trom low discharges in the mainstem may be of <br />insufficient magnitude during the spawning season (late fall <br />and winter) to prevent movement of trout up Nankoweap Creek <br />to spawn and to cause trout to be a readily accessible food <br />source for the eaqles. oischarges and the associated flows <br />that reduce the spawning potential of trout may be tied to <br />fluctuations or minima. <br /> <br />Intoraation Weeds: The necessary period for continuity of a <br />sufficient mainstream level at the mouth of Nankoweap Creek <br />needs to be established and compared to the periods created <br />by normal operational discharges as well as controlled <br />research discharges. Success ot trout movement up Nankoweap <br />Creek under various discharge and flow regimes during the <br />spawninQ season also needs to be determined and compared <br />with other factors attecting trout reproductive success in <br />the tributary. Estimates on success of bald eagle foraging <br />tor trout in the mainstream and Nankoweap Creek during the <br />season they are at Nankoweap need to be made and related to <br />trout access to Nankoweap Creek. <br /> <br />The following secondary hypotheses will be tested using the <br />research program established to test H.-4.J. <br /> <br />H.-5.1a. There is no significant relationship between trout <br />availability, trout access, bald eagle presence, bald eagle <br />abundance or bald eagle toraging success in the mainstream or <br /> <br />9 <br />
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