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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 />RESULTS and DISCUSSION <br /> <br />. <br /> <br />Results and Discussion are presented together and ordered by year to aid reader <br /> <br />understanding of the various combinations of flows and treatments and implications of results. <br /> <br />. <br /> <br />2004 <br /> <br />. <br /> <br />Recall that because none of the flood plains connected to the Green River during 2004, <br /> <br />captures of beads and larvae were only from nets set in the main channel. A total of 4,506 beads <br /> <br />(0.30% ofthe number released) and 253 marked larvae (0.36% of the number released) was <br /> <br />collected. Approximately 0.28% of the river flow was sampled, based on flow meter data from <br /> <br />drift nets. The first marked larvae arrived at the sampling site 1.6 km downstream from the <br /> <br />release site approximately 32 minutes after release (Figure 7). This first sampling interval also <br /> <br />documented the peak in drift abundance because the highest density of beads and larvae were at <br /> <br />the leading edge of the mass of particles released. Nearly all larvae were captured during the <br /> <br />first two sampling periods (about 1 hr) although some were collected nearly two hr after release. <br /> <br />The first beads were also collected approximately 36 minutes after release although peak bead <br /> <br />abundance did not occur until one hr after release. All beads and most marked larvae (n = 185, <br /> <br /> <br />98%) were collected on the right bank (no mid-channel sampling) which leads us to believe that <br /> <br /> <br />beads and larvae were released just below the island at Razorback Bar on the right half of the <br /> <br /> <br />river rather than across the channel as was formerly believed. Most beads (n = 3,207, 72%) and <br /> <br /> <br />marked larvae (n = 188, 74%) captured during 2004 sampling were captured 1.6 km downstream <br /> <br />of the release site, with the balance captured 8 km (the most downstream sampling location in <br /> <br />2004) downstream adjacent the Thunder Ranch wetland. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />32 <br /> <br />. <br />
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