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6 GLEN CANYON DAM ADAPTIVE MANAGEMENT PROGRAM Project 03 I. Title: Genetic relationships within and among populations of the endangered Gila cypha (humpback chub) in the Colorado River ecosystem II. Relationship to AMP Management Objectives: Management Objective 2.2- Sustain or establish viable HBC spawning aggregations outside ofthe LCR in the Colorado River Ecosystem below Glen Canyon Dam to remove jeopardy. Research Information Need 2.2.1 -What is a viable population and what is the appropriate method to assess population viability of native fish in the CRE. What is an acceptable probability of extinction over what management time period for humpback chub throughout the CRE Research Information Need 2.2.4-. What is the relationship between the "aggregations" in the mainstem and LCR? Are mainstem aggregations "sinks" of the LCR? Are aggregations real or due to sampling bias? III. Study Background/Rationale and Hypotheses: The Conservation Genetics and Larval Fish laboratories at Colorado State University, FOlt Collins (CO) will collaborate with researchers at other academic institutions and federal and state agencies to evaluate interrelationships among populations of the endangered Gila cypha within Grand Canyon (GC). Five populations from the Upper Colorado River basin will also be included in the study to gain perspective on basin-wide intraspecific relationships. Life history of G. cypha in GC is mostly enigmatic and interrelationships among subpopulations are virtually unknown. Lack of an historic baseline further complicates understanding of present-day patterns, and causal relationships between physical and biological parameters are merely the source of speculation. The most pressing questions pertain to genetic distinctiveness of aggregations in the mainstem Colorado River (MCR), the interrelationships among these and tributary populations, and how the sum can be adaptively managed in a dam-perturbed environment. Objectives of the proposed study are therefore to infer interrelationships among populations of G. cypha, to identifY (if possible) genetically distinct units, and to derive a management strategy for this endangered species IV. Study Goals, Objectives, End Product: A combination of molecular markers will be employed to investigate genetic relationships within- and among-populations ofG. cypha. Mitochondrial (mt) DNA sequence data from two regions of that molecule will allow identification of phylogenetic lineages within GC Created on 5/6/20035:41 PM 00803.