Laserfiche WebLink
<br />JOURNAL OF T[~ ARIZONA-NEVADA ACADEMY OF SCIENCE <br />VOL. 23 <br />Table 4. Fish Diversity, Density, and Biomass Comparisons for Lined Versus Unlined Sections of the Coachella <br />Canal, California, November 1980 and 1984. <br />Study (Unlined Canal) Species Diversity fish/m2 grams/m2 <br />Minckley et al. 1983 <br />Beaty 1981 <br />Beaty 1984 <br />Average <br />16/6/-62.5%* 0.2291.0$3/-83-8%-63.8 49.369/4.369/-92.2% <br />8/6/-25.0% 0.147/.08°11-73.5%-¢3 12.035/4.367/-63.7% <br />7/6/-14.3% 0.034/.089)+8.9% ~ ~~ 6.245/4.367/-30.1% <br />10/6/-40.0% 0.137/.Ofl9/-73.3% "sg~ `f 22.550/4.367/-80.6% <br />*UnlinedlLined (Table 3) /Percentage Change <br />As lining activities accelerate, cumulative impacts will <br />be to increase water velocities, resulting in increased <br />downstream drift of fishes and reduced protective <br />cover needed for spawning and rearing habitat. <br />Recruitment to populations in lined canals may depend <br />on downstream migration of fishes from upstream <br />sources. <br />ACKNOWLEDGEMENTS <br />We thank biologists from the Coachella Valley <br />Water District, Fish and Wildlife Service, California <br />Department of Fish and Game, and Imperial Irrigation <br />District for their assistance. Special gratitude goes to <br />Drs. Paul Beaty and Richard Thiery for coordinating <br />the water outage and to Mrs. Gretchen Wilborn for <br />typing and editing this manuscript. <br />LITERATURE CITED <br />BEATY, P.R., R.K. FULLER, E.M. HALLERMAN, <br />R.G. THIERY, and S.J. REGER. 1981. Environ- <br />mental Impact of Hybrid Combination (grass carp <br />X bighead carp) in two California irrigation sys- <br />tems. 1980 progress report; physiochemical and <br />faunal baseline investigations. Aquatic Research <br />Group, Coachella Valley Water District, California. <br />BEATY, P.R. 1984. Preliminary field notes and fishery <br />data compiled during November 1984 dewatering <br />of the Coachella Canal. Coachella Valley Water <br />District, California. <br />BUREAU OF RECLAMATION, U.S. DEPARTMENT <br />OF THE INTERIOR. 1984. Special Report-Water <br />Conservation Opportunities Imperial Irrigation <br />District, California. Lower Colorado Region, <br />Boulder City, Nevada. <br />MINCKLEY, W.L., W. RINNE, and G. MUELLER. <br />1983. Fishery inventory of the Coachella Canal, <br />Southeastern California. Journal of the Arizona- <br />Nevada Academy of Science 18:39-45. <br />