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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:14:05 PM
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UCREFRP
UCREFRP Catalog Number
9711
Author
Coggins, L.G.
Title
Abundance trends and status of the Little Colorado River population of humpback chub
USFW Year
2008.
USFW - Doc Type
an update considering 1989-2006 data.
Copyright Material
NO
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<br />Hi <br /> <br />Contents <br /> <br />Co nte nts.... ......... ..... ........... .... ......... .............. .................. ......... .............................. .................. ............. .......... iii <br /> <br />Exec utive Sum m a ry ....................... .... ............. .............. ........................................................ ...... ........ ...........1 <br /> <br />I ntro d u cti 0 n... .... ....... ...................... ................................ ............... .... ......... ........... ............ .... .......... ....... .........2 <br /> <br />M eth 0 ds..... .......... .................. ......... ................................ ........................ ......... ............. ................. ..................3 <br /> <br />Section 1-2006 Humpback Chub Assessment Update with Refinements ................................3 <br /> <br />In dex - Based Metrics ... .............................. ............. ....... ........ ....... ........... .... .... ...... ... ................ ..3 <br /> <br />T a gg;ng-B ase d Metrics ................. .............. ....... ...... ....... ........................ ...... ........... ................ ..4 <br /> <br />Eva I u ati ng Model Fit... ................. ............... ......... .................... ..................... ...,......... ........... .......5 <br /> <br />Section 2-Estimating the Humpback Chub Growth Function Using Mark-Recapture Data..5 <br />Section 3-lncorporation of Ageing Error in ASMR Assessments..............................................8 <br /> <br />Results .... .............. ......................... .................. ............ ............. ........... ....... .................. ............... ..................10 <br /> <br />2006 Humpback Chub Assessment Update with Refinements....................................................10 <br /> <br />In d ex - Ba sed Assessme nts ........................... .................... ....................................... ................10 <br /> <br />Tag gi n g-B a se d Assessments ..................... ...................... ................. ....................... ...............10 <br />Closed .Population Models .......................................................................................................10 <br />ASMR without Tag-Cohort Specific Data ..............................................................................11 <br />Model Evaluation and Selection ....................................................................................11 <br />ASMR with Tag-Cohort Specific Data ....................................................................................11 <br />Model Evaluation and Selection ....................................................................................12 <br />Assessment Update S ummary ................................................................................................12 <br />Estimating the Humpback Chub Growth Function Using Mark-Recapture Data .....................12 <br />Incorporation of Ageing Error in ASMR Assessments.................................................................13 <br /> <br />Disc ussi 0 n....... ....................... ........ ..................... .................... ........... ..... ...... ......... ...... .................. ..... ..........13 <br /> <br />2006 Humpback Chub Assessment Update with Refinements....................................................13 <br />Estimating the Humpback Chub Growth Function Using Mark-Recapture Data .....................14 <br />Incorporation of Ageing Error in ASMR Assessments.................................................................15 <br /> <br />Ac kn owl edg ements.... .................. ............... ....... ................... .... .............. ........... .......... .... ............ ..... ..........15 <br /> <br />Refe re n ces..... ..................... ................ ................ .......... ... .................... ....... .... .................... ..........................15 <br /> <br />Figures <br /> <br />1. Relative abundance indices of sub-adult and adult humpback chub based on hoop- <br />net catch rate (fish/hour) in the lower 1,2oo-m section of the little Colorado River and <br />trammel-net catch rate of adult humpback chub in the Little Colorado River inflow <br />reach of the Colorado River.....................................................................................................19 <br />2. Numbers of humpback chub marked and recaptured by age and year ..........................20 <br />3a. Numbers of humpback chub marked by age in years 1989-92 and subsequently <br />recaptured by age and year ....................................................................................................21 <br />3b. Numbers of humpback chub marked by age in years 1993-96 and'subsequently <br />recaptured by age and year ................................................................,...................................22 <br />3c. Numbers of humpback chub marked by age in years 1997-2000 and subsequently <br />recaptured by age and year ...................................................................,................................23 <br />3d. Numbers of humpback chub marked by age in years 2001-04 and subsequently <br />
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