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As part of our approach to analysis we have had to make a series of assumptions. One of those
<br /> assumptions is that the current levels of mercury in endangered fish tissue within the action area
<br /> is similar to what has been measured in the past, as discussed in the Baseline and Effects of the
<br /> Action sections above. The Trapper-funded conservation measures, as described above, are
<br /> expected to shed new light on mercury concentrations in the Yampa and White Rivers and in fish
<br /> tissue in the action area. If the results of these or similar studies indicate that water or fish tissue
<br /> concentrations are much higher than expected based on past sampling, reinitiation of this
<br /> consultation may be necessary. Other future studies may contribute information relevant to the
<br /> effects of the action and this consultation.
<br /> If, during implementation of the proposed action, changes in circumstances, situation, or
<br /> information regarding the proposed action occur, OSMRE will assess the changes and any
<br /> potential impacts to listed species, review the re-initiation triggers above, coordinate with the
<br /> Service, and make a determination as to whether reinitiation is necessary.
<br /> 8.0 LITERATURE CITED
<br /> Anderson, R. 2005. Riverine Fish Flow Investigations. Colorado Division of Wildlife Federal
<br /> Aid Project F-289-R7. Job Progress Report.
<br /> Badame, P. 2008. Population Estimates for Humpback Chub (Gila cypher) In Cataract Canyon,
<br /> Colorado River,Utah, 2003-2005. Upper Colorado River Endangered Fish Recovery
<br /> Program Project 922L. 24 pages.
<br /> Badame, P. 2011. Humpback chub population estimates for Desolation/Gray Canyons, Green
<br /> River Utah. Annual Report Project 129 of the Upper Colorado River Endangered Fish
<br /> Recovery Program, Denver, Colorado.
<br /> Badame, P. 2012. Population estimates for humpback chub (Gila cypher) in Desolation and Gray
<br /> Canyons, Green River, Utah 2006-2007. Final Report of Utah Division of Wildlife
<br /> Resources to Upper Colorado River Endangered Fish Recovery Program, Denver,
<br /> Colorado.
<br /> Beckvar,N., T.M. Dillon, and L.B. Reads. 2005. Approaches for linking whole-body fish tissue
<br /> residues of mercury or DDT to biological effects thresholds. Environ. Toxicol. and
<br /> Chemistry 24(8): 2094-2105.
<br /> Bestgen, K. R. 1990. Status review of the razorback sucker,Xyrauchen texanus. Larval Fish
<br /> Laboratory 944. Colorado State University, Fort Collins, Colorado. 91 pp.
<br /> Bestgen, K. R., J. A. Hawkins, G. C. White, K. Chrisopherson,M. Hudson,M. H. Fuller, D. C.
<br /> Kitcheyan, R. Brunson, P. Badame, G. B. Haines, J. Jackson, C.D. Walford, T. A. Sorenson
<br /> & T. B. Williams. 2005. Population status of Colorado pikeminnow in the Green River
<br /> Basin,Utah and Colorado. Colorado River Recovery Implementation Program Project
<br /> Numbers 22i and 22j. 113 pages.
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