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Last modified
7/14/2009 5:02:34 PM
Creation date
5/20/2009 3:39:59 PM
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UCREFRP
UCREFRP Catalog Number
8251
Author
Rakowski, C. L. and J. C. Schmidt.
Title
The Geomorphic Basis of Colorado Squawfish Nursery Habitat in the Green River Near Ouray, Utah.
USFW Year
1996.
USFW - Doc Type
#93-1070,
Copyright Material
NO
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<br />Draft Fmal Completion Report to UDWR for Contract #93-1070. Amendment 3 <br /> <br />20 <br /> <br />was used to assess habitat availability for large-scale remotely-sensed data, and a I.S-kIn reach within the lO-km reach <br />was used for smaller scale studies (Fig. 1). A small to large scale assessment strategy appropriate for the Green River <br />within Ouray NWR was implemented using the approach of Hill and others (1991). The geomorphology of nursery <br />habitat, the focus of this study, is of intermediate scale and addressed following the smaller scale "Habitat and Fish <br />Needs" component. <br /> <br />The Scale Appropriate for Assessing <br />Habitat and Fish Needs <br /> <br />IFIM was developed and validated for low flow periods in cold water streams, but the method has not proven <br /> <br /> <br />useful for warm water systems (Tyus, 1992). Consequently, empirically-based methodologies were employed to <br /> <br /> <br />determine small-scale habitat availability. For this study, the following habitat characteristics were quantified: <br /> <br />1) geomorphic setting, and maximum depth of individual habitats; <br /> <br />2) the relationship between area of available habitat and dischai-ge; and <br /> <br /> <br />3) the relationship between area and discharge as it changed from year to year. <br /> <br />Interpreted U.S. Bureau of Reclamation (Reclamation) video prints, taken during helicopter overflights taken at <br /> <br />base flow within the Ouray NWR, were used to deteJ:mine the geomorphic setting of individual habitats. Utah Division <br /> <br /> <br />of Wildlife Resources (UDWR) nursery habitat sampling data, taken in conjunction with the Reclamation video <br /> <br /> <br />overflights, were used to determine maximum habitat depth. Field mapping of habitat and flow patterns were used to aid <br /> <br /> <br />in interpretation of videography and delineation of individual nursery habitats. <br /> <br />Detailed topographic mapping and a stage-discharge relationship were used to synthesize the change in area of <br /> <br />available habitat as a function of discharge; maps made in the subsequent year were used to indicate the temporal <br /> <br />stability of the relationship between habitat availability and discharge. <br /> <br />Habitat Formation <br /> <br />The habitats utilized at low flows were created by bar and bank forms created by higher discharges, Bankfull <br /> <br /> <br />discharges are often assumed to control the form (for example, width) of the channel. Habitats for juvenile Colorado <br /> <br /> <br />SQuawfish were found at low discharges along the edges of bars and banks that were formed by higher discharges. For <br />
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