Humpback chub (Gila cypha) - Upper Colorado River Endangered ...

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TABLE OF CONTENTS 1.0 GENERAL INFORMATION ..........................................................................................................1 1.1 Purpose of 5-year Reviews ..................................................................................................1 1.2 Reviewers .............................................................................................................................1 1.3 Methodology Used to Complete Review .............................................................................2 1.4 Background ..........................................................................................................................2 1.4.1 Federal Register Notice Citation Announcing Initiations of This Review ..............2 1.4.2 Listing History .........................................................................................................3 1.4.3 Associated Rulemakings ..........................................................................................3 1.4.4 Review History ........................................................................................................3 1.4.5 Species’ Recovery Priority Number at Start of 5-year Review ...............................3 1.4.6 Recovery Plan or Outline .........................................................................................4 2.0 REVIEW ANALYSIS .....................................................................................................................5 2.1 Application of the 1996 Distinct Population Segment Policy .............................................5 2.2 Recovery Criteria .................................................................................................................5 2.2.1 Does the species have a final, approved recovery plan containing objective, measureable criteria? ...............................................................................................5 2.2.2 Adequacy of recovery criteria ..................................................................................6 2.2.2.1 Do the recovery criteria reflect the best available and most up-to-date information on the biology of the species and its habitat? .............................6 2.2.2.2 Are all of the 5 listing factors that are relevant to the species addressed in the recovery criteria? ..................................................................6 2.2.3 List the recovery criteria as they appear in the recovery plan, and discuss how each criterion has or has not been met, citing information ..............................6 2.3 Synthesis ............................................................................................................................19 3.0 RESULT ........................................................................................................................................21 3.1 Recommended Classification.............................................................................................21 3.2 New Recovery Priority Number ........................................................................................21 4.0 RECOMMENDATIONS FOR FUTURE ACTIONS ...................................................................21 5.0 REFERENCES ..............................................................................................................................22 ii
LIST OF FIGURES FIGURES 1. Estimated numbers of humpback chub adults in four of five populations of the Upper Colorado River Basin .......................................................................................................................8 2. Estimated numbers of humpback chub adults (≥ 200-mm TL) in the Grand Canyon population of the Lower Colorado River System ...............................................................9 LIST OF TABLES TABLE 1. Summary of the downlisting demographic and recovery factor criteria by recovery unit basin and a determination if the criteria have been met, partially met or not met for analyzing whether humpback chub can be downlisted ..................................................................20 iii
Page 1: Humpback chub (Gila cypha) 5-Year R
Page 5 and 6: Arizona Fishery Resources Office, W
Page 7 and 8: Degree of Threat Recovery Potential
Page 9 and 10: 2.2.2 Adequacy of recovery criteria
Page 11 and 12: Black Rocks Westwater Canyon 3500 1
Page 13 and 14: Lower Basin Recovery Unit Criterion
Page 15 and 16: The threat of predation by nonnativ
Page 17 and 18: Criterion 9. Measures should be ide
Page 19 and 20: Canyon that would allow for range e
Page 21 and 22: Factor D—Adequate existing regula
Page 23 and 24: have been met; 6 have been partiall
Page 25 and 26: Greater evaporation losses in the l
Page 27 and 28: Modde, T., W.J. Miller, and R. Ande

Humpback chub (Gila cypha) - Upper Colorado River Endangered ...

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