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~;." .~.] "... .. ~ .... -p,,- , ~ I :\ .-._ i . . . VI. Clarify the taxonon.i c st:ltUS ot the genus G.\ 101. A. Objective 1. Ensure that project area humpback chub (including the mainstream and Little Colorado River), bony tail chub from Lake Mohave, and other Gila in the Lower Basin, as necessary, will be included in the taxonomic study of Colorado River Basin Gila being conducted by the Fish and llildlife Service as a part of the Upper Basin Recovery and Implementation Plan 2. Coordinate progress and results with the agencies represented on the Glen Canyon Consultation Team (Arizona Game and Fish Department, Burean ot Reclamation, National Park Service. and Fish and Wildlife Service). B. Oiscussion Techniques using electrophoresis, mitochondrial DNA, and principle components analys.is will provide information on the taxonomic composition of Gila. The study should also include an analysis of gene-environment interactions. with emphasis on environmental mOdificatio;s due to damming of the Colorado.River.~nd its tributaries. as potential contributors to morphological variation in the genus Gila. Information on the humpback chub may assist our understanding of the continuity of that species popUlation in the project area. Relative importance of the Grand Canyon popUlation may be increased if hybridization is found to have affected other humpback popUlations. C. Time and Funding The taxonomic study has already commenced. This program will be under the direction of the Upper Basin Recovery and Implementation Program which will set the completion schedule. Funding for this measure is being provided by the Fish and Wildlife Service pursuant to Upper Basin, Region 6 commitments as part of the Upper Basin Recovery and Implementation Program. 8