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Last modified
1/26/2010 3:16:25 PM
Creation date
10/12/2006 4:46:14 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.10
Description
Colorado River-Water Projects-Glen Canyon Dam/Lake Powel-Glen Canyon Adaptive Management
Basin
Colorado Mainstem
Water Division
5
Date
4/22/2003
Author
GCMRC
Title
An Overview of Status and Trend Information for the Grand Canyon Population of the Humpback Chub
Water Supply Pro - Doc Type
Report/Study
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<br />Table I. Summary of closed population abundance estimates for the Little Colorado River population of humpback chub. <br /> <br />AUTHOR LOCATION DATE FISH ABUNDANCE METHOD COMMENTS <br /> SIZE ESTIMATE <br />Kaeding and LCR Inflow" and LCR. 1980-1981 >200 mm 7,000-8,000 Schnabel, Modified Schnabel, Authors claim this is a <br />Zimmerman 1982 and SchumacherlEschmeyer "ballpark" estimate due <br /> to assumption violations. <br />Minckley 1988 LCR confluence (<1.2 Ian) May 1987 >120mm 5,783 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts <br />Kubly 1990 LCR confluence (<1.2 Ian) May 1987 >140mm 1,800 Schnabel Author states estimate is <br /> biased and precision is <br /> DOOr. <br />Minckley 1988 LCR confluence (<1.2 Ian) May 1988 >120 mm 7,060 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts <br />Kubly 1990 LCR confluence (<1.2 Ian) May 1988 >140mm 2,900 Schnabel Author states estimate is <br /> biased and precision is <br /> poor. <br />Minckley 1989 LCR (<15 Ian) May 1989 > 150 mm 18,253 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts. <br />Kubly 1990 LCR (<15 Ian) May 1989 >140mm 5,500-25,000 Schnabel Author states estimate is <br /> (estimate stabilized biased and precision is <br /> near 5,000 fish) poor. <br />Minckley 1989 LCR confluence (<1.2 Ian) May 1989 >150mm 10,120 Petersen Invalid sample design; no <br /> distinction between mark <br /> and recapture efforts. <br /> <br />, Kaeding and Zimmerman defined the LCR Inflow Reach as Colorado River miles -51.5-71.5 <br />b Valdez and Ryel1995 defined the LCR Inflow Reach as Colorado River miles 57-65.4 <br />'Trammell and Valdez 2002 defined the LCR Inflow Reach as Colorado River miles 56.3-68.3 <br /> <br />Draft.:.. April 21, 2003 <br /> <br />14 <br /> <br />~~-- <br /> <br />;,;. <br />;:.~- <br /> <br />...... <br />;~. <br /> <br />- <br />
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