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Last modified
7/14/2009 5:02:37 PM
Creation date
5/22/2009 4:40:09 PM
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UCREFRP
UCREFRP Catalog Number
9641
Author
Hedrick, T. N., K. R. Bestgen and K. D. Christopherson.
Title
Entrainment of Semi-Buoyant Beads and Razorback Sucker, Xyrauchen texanus, Larvae into Flood Plain Wetlands of the Middle Green River, Utah.
USFW Year
2009.
USFW - Doc Type
C-6/RZ-ENTR,
Copyright Material
NO
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<br />. <br /> <br />. <br /> <br />begin. As in 2004, all drift nets were equipped with a GO Model 2030R mechanical flow meter <br /> <br />suspended in the center of the net. Samples were collected for up to five hr at each drift net <br /> <br />station and over 36 hours during each release when all sites were considered, which was ample <br /> <br />time to allow beads to travel the 85 km from the release sites to the site furthest downstream. <br /> <br />Depth and velocity measurements were taken across a transect within each wetland breach using <br /> <br />a Marsh-McBirney flow meter, usually at the beginning of the sampling period, but sometimes at <br /> <br />the end as well if flow stage changed by> 1.5 cm. Depth and velocity measurements allowed for <br /> <br />the calculation of the total flow entrained into the breach. On 21 and 25 May, Tetra Tech (2005) <br /> <br />measurements were used at the Stirrup as this information was not taken during the sampling <br /> <br />period. Main channel flows were recorded using measurements from the USGS gauging station <br /> <br /> <br />near Jensen, Utah. Significant tributary inflows (e.g., Ashley Creek (Gage # 09266500) and <br /> <br /> <br />Brush Creek (Gage # 09261700)) were added to Green River flows in appropriate locations to <br /> <br /> <br />properly estimate river flows near breaches. In addition, travel times were taken into account for <br /> <br />the Stirrup and Leota sites, as it takes over 24 hours for flows to reach these sites from the Jensen <br /> <br />gage. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Samples were kept in a cooler following collection with the intention of picking larvae <br /> <br />immediately. The number and size of samples did not allow for immediate processing so <br /> <br />samples were stored in a refrigerated environment for up to several months. Because larvae were <br /> <br />stored too long and likely disintegrated over the storage time, larvae were lost from nearly all <br /> <br />2005 samples. Immediate sorting of one sample from a Thunder Ranch breach by one of us <br /> <br />(KRB) revealed that six razorback sucker larvae were captured, demonstrating that larvae were <br /> <br />transported downstream and entrained into that flood plain wetland. <br /> <br />. <br /> <br />. <br /> <br />24 <br /> <br />. <br />
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