The State of Natural and Cultural Resources in the Colorado River Ecosystem:
JUNE 30, 1999 DRAFT REPORT
Grand Canyon Monitoring and Research Center
Flagstaff, AZ 86001
Updated: 30 June 1999
Table of Contents
- Executive Summary
- Introduction and Administration
- Physical Resources and Processes: Climate, Hydrology, Sediment
- Water Quality: Lake Powell and the Colorado River Downstream
- Aquatic Biological Resources: Foodbase, Habitat, Native Fish, Non-native Fish
- Terrestrial Biological Resources: Vegetation, Habitat, Wildlife
- Endangered Species and Species of Concern
- Cultural Resources: Archeological Sites; TCP's; Ethonobiology; Havasupai, Hopi, Hualapai, Navajo, Southern Paiute and Zuni Tribes
- Socio-economic Resources: River Running, Angling, Hydropower Production
- Acknowledgements
- Bibliography
- Top of Page
Bibliography
CITED AND RELEVANT COLORADO RIVER ECOSYSTEM AND MANAGEMENT LITERATURE
(Updated 23 June 1999)
Aldrich, J.W. 1951. A review of the races of the Traill's flycatcher. Wilson Bull. 63(3): 192-197.
Aldrich, J.W. 1953. Habitats and habitat differences in two races of Traill's flycatcher. Wilson Bull. 65(1): 8-11.
Anderson, L.S. and G.A. Ruffner. 1988. Effects of the post-Glen Canyon Dam flow regime on the old high water zone plant community along the Colorado River in Grand Canyon. NTIS PB88-183504/AS.
Angradi. T.R. 1994. Trophic linkages in the lower Colorado River: multiple stable isotope evidence. J. North American Benthological Society 13:479-495.
Angradi, T.R. and D.M. Kubly. 1993. Effects of atmospheric exposure on chorophyll a, biomass and productivity of the epilithon of a tailwater river. Regulated Rivers: Research & Management 8:345-358.
Angradi, T. R., R. W. Clarkson, D. A. Kingsolving, D. M. Kubly, and S. A. Morgensen.1992. Glen Canyon Dam and the Colorado River: responses of the aquatic biota to dam operations. Bureau of Reclamation Glen Canyon Environmental Studies Program, Flagstaff.
Behle, W.H. and H.G. Higgins. 1959. The birds of Glen Canyon. Pp 107-133 in Woodbury, A.M. (ed.). Ecological studies of flora and fauna in Glen Canyon. University of Utah Anthropological Papers 40 (Glen Canyon Series No. 7).
Bestgen, K.R. 1990. Status review of the razorback sucker, Xyrauchen texanus. Colorado State University Larval Fish Laboratory Contribution 44. Fort Collins, CO.
Blinn, D.W., L.E. Stevens and J.P. Shannon. 1992. The effects of Glen Canyon Dam on the aquatic food base in the Colorado River corridor in Grand Canyon, Arizona. Bureau of Reclamation Glen Canyon Environmental Studies Report II-02, Flagstaff, AZ.
Blinn, D.W., J.P. Shannon, L.E. Stevens and J.P. Carder. 1995. Consequences of fluctuating discharge for lotic communities. Journal of the North American Benthological Society 14:233-248.
Bohning-Gaese, K., M.L. Taper, and J.H. Brown. 1993. Are declines in North American insectivorous songbirds due to causes on the breeding range? Conservation Biology 7(1): 76-86.
Bozek, M.A., L.J. Paulson and J.E. Deacon. 1984. Factors affecting reproductive success of bonytail chubs and razorback suckers in Lake Mohave. U.S. Bureau of Reclamation Final Report 14-16-0002-81-251, Boulder City, NV.
Brown, B. T. 1988. Breeding ecology of a willow flycatcher population in Grand Canyon, Arizona. Western Birds 19:25-33.
Brown, B.T. 1991a. Abundance, distribution, and ecology of nesting peregrine falcons in Grand Canyon National Park, Arizona. Grand Canyon National Park Report.
Brown, B. T. 1991b. Status of nesting willow flycatchers along the Colorado River from Glen Canyon Dam to Cardenas Creek, Arizona. Endangered Species Report No. 20, U.S. Fish and Wildlife Service, Phoenix, Arizona. 34 pp.
Brown, B.T. 1993. Winter foraging ecology of bald eagles in Arizona. Condor 95:132-138.
Brown, B.T. 1994. Rates of brood parasitism by brown-headed cowbirds on riparian passerines in Arizona. Journal of Field Ornithology 65:160-168.
Brown, B.T. and W.C. Leibfried. 1990. The effects of fluctuating flows from Glen Canyon Dam on bald eagles and rainbow trout at Nankoweap Creek along the Colorado River, Arizona. 1990 Interim Report to the Glen Canyon Environmental Studies, U.S. Bureau of Reclamation, Upper Colorado Region, Salt Lake City, UT.
Brown, B.T. and L.E. Stevens. 1991. Influences of fluctuating flows from Glen Canyon Dam and effects of human disturbance on wintering bald eagles along the Colorado River in Grand Canyon, Arizona, Final Report. U.S. Bureau of Reclamation Glen Canyon Environmental Studies Report, Flagstaff.
Brown, B.T. and L.E. Stevens. 1992. Winter abundance, age structure, and distribution of bald eagles along the Colorado River, Arizona. Southwestern Naturalist 37:404-435.
Brown, B.T. and L.E. Stevens. 1997. Winter bald eagle distribution is inversely correlated with human activity along the Colorado River, Arizona. Journal of Raptor Research 31:7-10.
Brown, B.T. and M.W. Trossett. 1989. Nesting-habitat relationships of riparian birds along the Colorado River in Grand Canyon, Arizona. Southwestern Naturalist 34(2):260-270.
Brown, B.T., S.W. Carothers, L.T. Haight, R.R.Johnson, and M.M. Riffey. 1984. Birds of the Grand Canyon region: an annotated checklist. Grand Canyon Natural History Association, Monograph Number 1. 54 pp.
Brown, B.T., R. Mesta, L.E. Stevens and J. Weisheit. 1989. Changes in winter distribution of bald eagles along the Colorado River in Grand Can;yon, Arizona. Journal of Raptor Research 23:110-113.
Brown, B.T., G.S. Mills, R.L. Glinski, and S.W. Hoffman. 1992. Density of nesting peregrine falcons in Grand Canyon National Park, Arizona. Southwestern Naturalist 37:188-193.
Brown, B.T., L.E. Stevens and T. Yates. Influences of fluctuating flows on bald eagle foraging behavior. The Condor, in press.
Burnham, W. 1987. Three-year report, Rocky Mountain Peregrine Program. National Park Service, Denver.
Carothers, S.W. and C.O. Minckley. 1981. A survey of the fishes, aquatic invertebrates and aquatic plants of the Colorado River and selected tributaries from Lees Ferry to Separation Rapids, Final Report. Water and Power Resources Service, Salt Lake City, UT.
Childs, M.R., R.W. Clarkson and A.T. Robinson. 1998. Resource use by larval and early juvenile native fishes in the Little Colorado River, Grand Canyon, Arizona. Transactions of the American Fisheries Society 127:620-629.
Christensen, K. The river runs to Mile 254. Pp. 65 in Glen Canyon Dam beach/habitat building flow: abstracts and summaries. Grand Canyon Monitoring and Research Center, April 1997.
Clarke. A.H. 1991. Status survey of selected land and freshwater gastropods in Utah. U.S. Fish and Wildlife Service Report, Denver, CO.
Cole, G.A. and D.M. Kubly. 1976. Limnologic studies on the Colorado River from Lees Ferry to Diamond Creek. Colorado River Research Series Report No. 8, Grand Canyon.
Cooley, M.E., J.W. Harshbarger, J.P. Akers, and W.F. Hardt. 1969. Regional hydrogeology of the Navajo and Hopi Indian Reservations, Arizona, New Mexico, and Utah. U.S. Geological Survey Professional Paper 521A.
Detrich, P.J. 1987. Effects of water projects on western raptors. Pp. 204-108 in Proceedings of the Western Raptor Management Symposium and Workshop, Boise Idaho, October 26-28, 1987.
Dill, W.A. 1944. The fishery of the lower Colorado River. California Fish and Game 30:309-401.
Douglas, M.E. and P.C. Marsh. 1996. Population estimates/population movements of Gila cypha, an endangered cyprinid fish in the Grand Canyon region of Arizona. Copeia 1996:15-28.
Drost, C.A. and M.K. Sogge. 1995. Monitoring of brown-headed cowbird impact on nesting migrant birds in Grand Canyon National Park: 1995 progress report. National Biological Service Colorado Plateau Research Station, Flagstaff, AZ.
Ellis, D.H. and G. Monson. 1989. A historical review of peregrine falcon breeding and summering records for Arizona and the Navajo Indian Reservation. The Southwestern Naturalist 34:565-569.
Ferriss, J.H. 1910. A collecting excursion north of the Grand Canyon of the Colorado. The Nautilus 23:109-112.
Flett, M.A. and S.D. Sanders. 1987. Ecology of a Sierra Nevada population of willow flycatchers. Western Birds 18:37-42.
Glinski, R.L. 1993. Peregrine falcon recovery in the Southwest: the administrative necessity for a survey protocol and the ecological importance of the Grand Canyon, National Park. Pp. 49-55 in Rowlands, P.G., C. van Riper III, and M.K. Sogge, editors. Proceedings of the First Biennial Conference on Research in Colorado Plateau National Parks. Transactions and Proceedings Series NPS/NRNAU/NRTP-93-10, National Park Service, Washington, D.C.
Gorman, O.T. 1994. Habitat use by humpback chub, Gila cypha, in the Little Colorado River and other tributaries of the Colorado River: GCES Phase II final report. U.S. Fish and Wildlife Service Arizona Fishery Resources Office - Flagstaff, AZ.
Gorski, L.J. 1969. Traill's flycatchers of the "fitz-bew" songform wintering in Panama. Auk 86:745-747.
Grand Canyon Monitoring and Research Center. 1997. The state of natural and cultural resources in the Colorado River ecosystem. U.S. Department of the Interior, Grand Canyon Monitoring and Research Center, Flagstaff.
Grams, P.E. and J.C. Schmidt. 1998. Synthesis of geomorphic data in the Point Hansbrough and Little Colorado River confluence study reaches: draft final report. Grand Canyon Monitoring and Research Center, Flagstaff, AZ.
Hamman, P.L. 1982. Spawning and culture of humpback chub. Progressive FishCulturist 44(4):213-216.
Hanka, L. R. 1985. Recent altitudinal range expansion by the brown-headed cowbird in Colorado. Western Birds 16:183-184.
Harris, J.H. 1991. Effects of brood parasitism by brown-headed cowbirds on willow flycatcher nesting success along the Kern River, California. Western Birds 22:13-26.
Howard, A.D. and R. Dolan. 1981. Geomorphology of the Colorado River. Journal of Geology 89:269-298.
Johnson, M.J. and M.K. Sogge. 1995. Cowbird concentrations at livestock corrals in Grand Canyon National Park. Pp. 275-284 in Van Riper, C., III (ed.). Proceedings of the Second Biennial Conference on Research in Colorado Plateau National Parks. National Park Service Transactions and Proceedings Series NPS/NRNAU/NRTP-95/11.
Johnson, R.R. 1991. Historic changes in vegetation along the Colorado River in the Grand Canyon . Pp. 178-206 in Marzolf, G.R., ed. Colorado River ecology and dam management. National Academy Press, Washington.
Johnson, R.R. and L.T. Haight. 1987. Endangered habitats versus endangered species: A management challenge. Western Birds 18:89-96.
Kaeding, L.R. and M.A. Zimmerman. 1983. Life history and ecology of the humpback chub in the Little Colorado and Colorado rivers of the Grand Canyon. Transactions of the American Fisheries Society 112:577-594.
Kanab Ambersnail Interagency Monitoring Group. 1997a. The impacts of an experimental flood from Glen Canyon Dam on the endangered Kanab ambersnail at Vaseys Paradise, Grand Canyon, Arizona. Grand Canyon Monitoring and Research Center, Flagstaff.
Kanab Ambersnail Interagency Monitoring Group. 1997b. The endangered Kanab ambersnail at Vaseys Paradise, Grand Canyon, Arizona: 1997 draft annual report. Grand Canyon, Arizona. Grand Canyon Monitoring and Research Center, Flagstaff.
Kaplinski, M.,.J.E. Hazel, M.F. Manone, R.A. Parnell and A. Dale. 1998. Colorado River sediment storage in Grand Canyon during calendar year 1997: final report. GCMRC, Flagstaff, AZ.
Karp, C. A., and H. M. Tyus. 1990. Humpback Chub (Gila cypha) in the Yampa and Green Rivers with observations on other sympatric fishes. Great Basin Naturalist 50:257-264.
Kearney, T.H. and R.H. Peebles (editors). 1960. Arizona flora, 2nd edition. University of California Press, Berkeley.
Kearsley, L.H., J.C. Schmidt and K. D. Warren. 1994. Effects of Glen Canyon Dam on Colorado River sand deposits used as campsites in Grand Canyon National Park, USA. Regulated Rivers: Research & Management 9:137-149.
Kerns, B.K. 1993. Alluvial chronology, malacology, and archaeology in middle Grand Gulch, southeast Utah. Northern Arizona University Geology Department Master's Thesis, Flagstaff.
King, J.R. 1955. Notes on the life history of Traill's flycatcher (Empidonax traillii) in southeastern Washington. Auk 72:148-173.
Kubly, D. M. 1990. The endangered humpback chub ( Gila cypha ) in Arizona. A review of past studies and suggestions for future research. Bureau of Reclamation report, Glen Canyon Environmental Studies Program, Flagstaff.
Leap, L.M., T. Burchett, J.L. Kunde, N.B. Andrews and D.C. Hubbard. 1998. Summary report: archaeological site monitoring and management along the Colorado River corridor below the Glen Canyon Dam. Grand Canyon National Park, Flagstaff.
Leibfried, W.C. and W.L. Montgomery. 1993. Regulated flows, trout spawning, and abundance of bald eagles on the Colorado River, Grand Canyon National Park. Pp. 37-48 in Rowlands, P.G., C. van Riper III, and M.K. Sogge, editors. Proceedings of the First Biennial Conference on Research in Colorado Plateau National Parks. Transactions and Proceedings Series NPS/NRNAU/NRTP-93-10, National Park Service, Washington, D.C.
Lupher, M.L. and R.W. Clarkson. 1994. Temperature tolerance of humpback chub (Gila cypha) and Colorado squawfish (Ptychocheilus lucius), with a description of culture methods for humpback chub. Arizona Game and Fish Department Report, Cooperative Agreement 9-FC-40-07940, Phoenix, AZ.
Maddux, H.R., D.M. Kubly, J.C. DeVos Jr., W.R. Persons, R. Staedicke, and R.L. Wright. 1987. Effects of varied flow regimes on aquatic resources of Glen and Grand canyons. U.S. Bureau of Reclamation Glen Canyon Environmental Studies Report, National Technological Information Series PB88-183439/AS.
Marsh, P. C. 1985. Effect of incubation temperature on survival of embryos of native Colorado River fishes. The South western Naturalist 30(1):129-140.
Marsh, P.C. and W.L. Minckley. 1989. Observations on recruitment and ecology of razorback sucker: Lower Colorado River, Arizona-California-Nevada. Great Basin Naturalist 49:71-78.
McCarthy, M.S. and W.L. Minckley. 1987. Age estimation for razorback sucker (Pisces: Catostomidae) from Lake Mohave, Arizona and Nevada. Journal of the Arizona-Nevada Academy of Sciences 21:87-97.
McElroy, D.M., and M.E. Douglas. 1995. Patterns of morphological variation among endangered populations of Gila robusta and Gila cypha ( Teleostei: Cyprinidae) in the upper Colorado River Basin. Copeia 1995:636-649.
McGuinn-Robbins, D.K. 1997. Comparison of the number and area of backwaters associated with the Colorado River in Glen, Marble and Grand canyons, Arizona. Arizona Game and Fish Department Report, Phoenix.
Miller, R.R. 1946. Gila cypha, a remarkable new species of cyprinid from the Colorado River in Grand Canyon, Arizona. Papers of the Michigan Academy of Sciences and Arts Letters. 40:125-136.
Minckley, W.L. 1973. Fishes of Arizona. Arizona Game and Fish Department, Phoenix, AZ.
Minckley, W.L. 1983. Status of the razorback sucker, Xyrauchen texanus (Abbott), in the Lower Colorado River Basin. Southwestern Naturalist 28:165-187.
Minckley, W.L. 1991. Native fishes of the Grand Canyon region: an obituary? Pp. 124-177 in Marzolf, G.R. (lead editor). Colorado River ecology and dam management. National Academy Press, Washington, D.C.
Mueller, G. 1989. Observations of spawning razorback sucker (Xyrauchen texanus) utilizing riverine habitat in the Lower Colorado River, Arizona-Nevada. Southwestern Naturalist 34:147-149.
Muiznieks, B.D., T.E. Corman, S.J. Sferra, M.K. Sogge and T.J. Tibbitts. 1994. Arizona Partners in Flight southwestern willow flycatcher survey 1993. Arizona Game and Fish Department report, Phoenix, AZ.
New Mexico Department of Game and Fish. 1986. Handbook of species endangered in New Mexico, Santa Fe, New Mexico.
Ohmart, R.D. and R.J. Sell. 1980. The bald eagle of the Southwest, with special emphasis on the breeding population of Arizona. U.S. Water and Power Resources Service, Denver.
Paradzick, C.E., R.F. Davidson, J.W. Rourke, M.W. Sumner, T.D. McCarthey. 1999. Southwestern willow flycatcher 1998 survey and nest monitoring report. Nongame and Endangered Wildlife Program Technical Report 141. Arizona Game and Fish Department, Phoenix.
Parnell, R.A., Jr., J.B. Bennett and L.E. Stevens. 1999. Mineralization of riparian vegetation buried by the 1996 controlled flood. Pp. 225-239 in Webb, R.H., J.C. Schmidt, G.R. Marzolf, and R.A. Valdez, editors. The controlled flood in Grand Canyon. American Geophysical Union Geophysical Monograph 110. Washington.
Patten, D.T., D.A. Harpman, M.I. Voita, and T.M. Randle. A Managed Flood on the Colorado River: Background, Objectives, Design, and Implementation. Ecological Applications, in press.
Patten, D.T., J.C. Schmidt, E.D. Andrews, L.E. Stevens, W.L. Minckley, G.R. Marzolf and J.A. Stanford. 1994. Experimental high discharge release from Glen Canyon Dam through Grand Canyon National Park: draft work plan. Bureau of Reclamation Glen Canyon Environmental Studies, Flagstaff.
Phillips, A.R. 1948. Geographic variation in Empidonax traillii Auk 65:507-514.
Phillips, A.M. III and L. Jackson. 1997. Monitoring Hualapai ethnobotanical resources along the Colorado River, 1997 Annual Report. Hualapai Cultural Resources Division, Peach Springs.
Pilsbry, H.A. 1948. Land Mollusca of North America. The Academy of Natural Sciences of Philadelphia Monographs II(2):xivi,521-1113.
Pilsbry, H.A. and J.H. Ferriss. 1911. Mollusca of the southwestern states, V: the Grand Canyon and northern Arizona. Proceedings of the Academy of Natural Sciences of Philadelphia 63:174-199.
Porter, R. D., and C. M. White. 1973. The peregrine falcon in Utah, emphasizing ecology and competition with the prairie falcon. Brigham Young University Biology Series 18:1-74.
Rubin, D.M., J.M. Nelson and D.J. Topping. 1998. Relation of inversely graded deposits to suspended-sediment grain-size evolution during the 1996 flood experiment in Grand Canyon. Geology 26:99-102.
Rubin, D.M., J.C. Schmidt and J.N. Moore. 1990. Origin, structure, and evolution of a reattachment bar, Colorado River, Grand Canyon, Arizona. Journal of Sedimentary Petrology 60:982-991.
Salzer, M.W., V.A.S. McCord, L.E. Stevens and R.H. Webb. 1996. The dendrochronology of Celtis reticulata in the Grand Canyon: assessing the impact of regulated river flow on tree growth. Pp. 273-281 in J.S. Dean, D.M. Meko and T.W. Swetnam (editors). Tree Rings, Environment and Humanity. Radiocarbon.
Schmidt, J.C. 1990. Recirculating flow and sedimentation in the Colorado River in Grand Canyon, Arizona. Journal of Geology 98:709-724.
Schmidt, J.C. 1993. Flume simulation of recirculating flow and sedimentation. Water Resources Research 29:2925-2939.
Schmidt, J.C. 1999. Summary and synthesis of geomorphic studies conducted during the 1996 controlled flood in Grand Canyon. . Pp. 329-341 in Webb, R.H., J.C. Schmidt, G.R. Marzolf, and R.A. Valdez, editors. The controlled flood in Grand Canyon. American Geophysical Union Geophysical Monograph 110. Washington.
Schmidt, J.C. and J.B. Graf. 1990. Aggradation and degradation of alluvial sand deposits, 1965-1986, Colorado River, Grand Canyon National Park, Arizona. U.S. Geological Survey Professional Paper 1493.
Schmidt, J.C. and D.M. Rubin. 1995. Regulated streamflow, fine-grained deposits, and effective discharge in canyons with abundant debris fans. Pp177-195 in Costa, J.E., A.J. Miller, K.W. Potter and P.R. Wilcock, editors. Natural and anthropogenic influences in fluvial geomorphology. AGU Geophysical Monograph 89.
Schmidt, J.C., R.H. Webb, R.A. Valdez, R. Marzolf and L.E. Stevens. 1998. Science and values in river restoration in the Grand Canyon. BioScience 48:735-747.
Sferra, S.J., R.A. Meyer and T.E. Corman. 1995. Arizona Partners in Flight southwestern willow flycatcher survey 1993. Arizona Game and Fish Department Final Technical Report 69, Phoenix, AZ.
Shannon, J.P., D.W. Blinn, and L.E. Stevens. 1994. Trophic interactions and benthic animal community structure in the Colorado River, Arizona, U.S.A. Freshwater Biology 31:213-220.
Sogge, M.K. 1995. Southwestern willow flycatchers in the Grand Canyon Pp. 89-91 in LaRoe, E.T., G.S. Farris, C.E. Puckett, P.D. Doran, and M.J. Mac, editors. Our living resources: a report to the nation on the distribution , abundance, and health of U.S. plants, animals and ecosystems. U.S. Department of Interior National Biological Service, Washington.
Sogge, Mark K. 1998. Status and distribution of the southwestern willow flycatcher along the Colorado River in the Grand Canyon - 1997. U.S. Geological Survey Biological Resources Division, Colorado Plateau Field Station, Flagstaff.
Sogge, M.K. and T. Tibbitts. 1992. Southwestern Willow Flycatcher (Empidonax traillii extimus) surveys along the Colorado River in Grand Canyon National Park and Glen Canyon National Recreation Area - 1992 Summary Report. National Park Service Cooperative Park Studies Unit/Northern Arizona University and U.S. Fish and Wildlife Service Report.
Sogge, M.K., T.J. Tibbitts, and J.R. Petterson. 1997. Status and breeding ecology of the southwestern willow flycatcher in the Grand Canyon. Western Birds 28:142-157.
Sogge, M.K., T.J. Tibbitts, C.Van Riper III and T. May. 1995a. Status of the southwestern willow flycatcher along the Colorado River in Grand Canyon National Park - 1995, Summary Report. National Biological Service Colorado Plateau Research Station/Northern Arizona University, Flagstaff.
Sogge, M.K., C.Van Riper III, T.J. Tibbitts, and T. May. 1995b. Monitoring winter bald eagle concentrations in the Grand Canyon: 1993-1995. National Biological Service Colorado Plateau Research Station/Northern Arizona University, Flagstaff.
Sogge, M.K., D. Felley and W. Wotawa. 1998. Riparian bird community ecology in the Grand Canyon - final report. U.S. Geological Survey Biological Resources Division, Flagstaff, AZ.
Springer, A.E., W.D. Petroutson, and B.A. Gilbert. 1999. Spatial and temporal variability of hydraulic conductivity in an active sedimentary environment. Ground Water.
Spamer, E.E. and A.E. Bogan. 1993a. Mollusca of the Grand Canyon and vicinity, Arizona: new and revised data on diversity and distributions, with notes on Pleistocene-Holocene mollusks of the Grand Canyon. Proceedings of the Academy of Natural Sciences of Philadelphia 144:21-68.
Spamer, E.E. and A.E. Bogan. 1993b. New records of Mollusca for Grand Canyon National Park and Arizona. The Southwestern Naturalist 38:293-298.
Stahlmaster, M.V. 1987. The bald eagle. Universe Books, New York.
Stanford, J.A., J.V. Ward, W.J. Liss, C.A Frissell, R.N. Williams, J.A. Lichatowich, and C.C. Coutant. 1996. A general protocol for restoration of regulated rivers. Regulated Rivers: Research & Management 12:391-413.
Stevens, L.E. 1985. Invertebrate herbivore community dynamics on Tamarix chinensis Loueiro and Salix exigua Nuttall in the Grand Canyon, Arizona. Northern Arizona University Masters Thesis, Flagstaff, AZ.
Stevens, L.E. and T.J. Ayers. 1992. The impacts of Glen Canyon Dam on riparian vegetation and soil stability in the Colorado River corridor, Grand Canyon, Arizona: 1992 final report. U.S. Bureau of Reclamation Glen Canyon Environmental Studies Report, Flagstaff, AZ.
Stevens, L.E. and G.L. Waring. 1988. Effects of post-dam flooding on riparian substrates, vegetation, and invertebrate populations in the Colorado River in Grand Canyon, Arizona. U.S. Bureau of Reclamation Glen Canyon Environmental Studies Report, National Technical Information Series PB88-183488/AS.
Stevens, L.E. and D.L. Wegner. 1995. Management of Glen Canyon Dam for
environmental purposes: the Colorado River in the Grand Canyon. Proceedings
of the Environmental Protection Agency National Symposium on Using
Ecological Restoration to meet Clean Water Act Goals 65-74. Chicago.
Stevens, L.E., V.J. Meretsky, J.R. Petterson, J.C. Nagy and F. R. Protiva. 1996. Impacts of a beach/habitat building flow from Glen Canyon Dam on endangered southwestern willow flycatcher in Grand Canyon, Arizona: final report. Grand Canyon Monitoring and Research Center, Flagstaff, AZ.
Stevens, L.E., K.A. Buck, B.T. Brown, and N.C. Kline. 1997a. Dam and geomorphological influences on Colorado River water distribution, Grand Canyon, Arizona, USA. Regulated Rivers: Research & Management 13:151-169.
Stevens, L.E., F.R. Protiva, D.M. Kubly, V.J. Meretsky and J. Petterson. 1997b. The ecology of Kanab ambersnail (Succineidae: Oxyloma haydeni kanabensis Pilsbry, 1948) at Vaseys Paradise, Grand Canyon, Arizona: final report. U.S. Bureau of Reclamation Glen Canyon Environmental Studies Program Report, Flagstaff, AZ.
Stevens, L.E., J.P. Shannon, and D.W. Blinn. 1997c. Colorado River benthic ecology in Grand Canyon, Arizona: dam, tributary and geomorphological influences. Regulated Rivers: Research & Management 13:129-149.
Stevens, L.E. J.E. Sublette and J.P. Shannon. 1998. Chironomidae (Diptera) of the
Colorado River in Grand Canyon, Arizona, U.S.A., II: Distribution and phenology. The
Great Basin Naturalist 58:147-155.
Stevens, L.E., B.T. Brown, and K. Rowell. 1998. Peregrine falcon foraging ecology in Grand Canyon, Arizona. Grand Canyon Monitoring and Research Center, Flagstaff.
Sublette, J.E., L.E. Stevens and J.P. Shannon. 1998. Chironomidae Diptera) of the
Colorado River in Grand Canyon, Arizona, U.S.A., I: Taxonomy and ecology. The Great Basin Naturalist:58:97-146.
Suttkus, R.D., and G. J. Clemmer. 1977. The humpback chub, Gila cypha , in the Grand Canyon area of the Colorado River, Occasional Papers of the Tulane University Museum of Natural History 1:1-20. New Orleans, La.
Suttkus, R.D. and G.H. Clemmer. 1979. Fishes of the Colorado River in Grand Canyon National Park. National Park Service Transactions and Proceedings Series 5:599-604.
Tibbitts, T.J., M.K. Sogge, and S.J. Sferra. 1994. A survey protocol for the southwestern willow flycatcher (Empidonax traillii extimus). U.S. Department of the Interior, National Park Service. Technical Report NPS/NAUCPRS/NRTR-94/04. Colorado Plateau Research Station, Northern Arizona University, Flagstaff, AZ. 24 pp.
Topping, D.J. 1998. Comparison of model predictions and recent measurements of Paria River sediment discharge. Draft USGS report submitted to GCMRC, Flagstaff, AZ.
Tuegel, M., T. Hoffnagle, M. Brouder, K. Tinning and B. Persons. 1995. AGFD & Bio/West native fish interim monitoring study. Arizona Game and Fish Department, Phoenix, AZ.
Turner, R.M. and M.M. Karpiscak. 1980. Recent vegetation changes along the Colorado River between Glen Canyon Dam and Lake Mead, Arizona. U.S. Geological Survey Professional Paper 1132.
Tyus, H.M. 1987. Distribution, reproduction, and habitat use of the razorback sucker in the Green River, Utah 1979-1986. Transactions of the American Fisheries Society 116:111-116.
Tyus, H.M. and C.A. Karp. 1989. Habitat use and streamflow needs of rare and endangered fishes, Yampa River, Colorado. U.S. Fish and Wildlife Service Biological Reports 89:1-27.
Tyus, H.M. and W.L. Minckley. 1988. Migrating Mormon crickets, Anabrus simplex (Orthoptera: Tettigoniidae), as food for stream fishes. Great Basin Naturalist 48:24-30.
Unitt, Philip. 1987. Empidonax traillii extimus: An endangered subspecies. Western Birds 18:137-162.
U.S. Bureau of Reclamation. 1990. Graphical Detail of Historic Streamflows, Water Releases and Reservoir Storage for Glen Canyon Dam and Lake Powell. Bureau of Reclamation Water Management Section, Denver, CO.
U.S. Bureau of Reclamation. 1995. Operation of Glen Canyon Dam: final environmental impact statement. U.S. Department of the Interior Bureau of Reclamation, Salt Lake City.
U.S. Bureau of Reclamation. 1998. Report of the Spike Flow Subgroup. BOR Memorandum dated 17 January 1998.
U.S. Fish and Wildlife Service. 1983. Endangered Species Technical Bulletin 15(2).
U.S. Fish and Wildlife Service. 1984. American peregrine falcon Rocky Mountain/Southwest population recovery plan. U.S. Fish and Wildlife Service, Denver, CO.
U.S. Fish and Wildlife Service. 1991. Endangered and threatened wildlife and plants: the razorback sucker (Xyrauchen texanus) determined to be an endangered species, 50 CFR Part 17, Final Rule, October 23, 1991. Federal Register 56(205):54957-54967.
U.S. Fish and Wildlife Service. 1991a. Endangered and threatened wildlife and plants; emergency rule to list the Kanab ambersnail as endangered. Federal Register 56(153):37668-37671.
U.S. Fish and Wildlife Service. 1991b. Endangered and threatened wildlife and plants; proposal to list the Kanab ambersnail as endangered and designate critical habitat. Federal Register 56(221):58020-58026.
U.S. Fish and Wildlife Service. 1992a. Endangered and threatened wildlife and plants; final rule to list the Kanab ambersnail as endangered. Federal Register 57(75):13657-13661.
U.S. Fish and Wildlife Service. 1992b. 90-Day finding on petition to list the southwestern willow flycatcher and initiation of status review. Federal Register 57:39664-39668, Sept. 1.
U.S. Fish and Wildlife Service. 1993. Proposed rule to list the southwestern willow flycatcher as endangered with critical habitat. Federal Register 58: 39495-39522, July 23.
U.S. Fish and Wildlife Service. 1994. Biological Opinion on the Operations of Glen Canyon Dam. 21 December 1994 Memorandum, Phoenix Field Office.
U.S. Fish and Wildlife Service. 1994. Habitat use by humpback chub, Gila cypha, in the
Little Colorado River and other tributaries of the Colorado River. Glen Canyon
Environmental Studies Phase II Annual Report. 129 pp.
U.S. Fish and Wildlife Service. 1995. Endangered and threatened wildlife and plants: final rule to reclassify the bald eagle from endangered to Threatened in all of the lower 48 states. Federal Register 60(133):36000-36010, July 12, 1995
U.S. Fish and Wildlife Service. 1996. Biological Opinion on a Proposed Beach Habitat Building Flow from Glen Canyon Dam. Memorandum, Phoenix Field Office.
U.S. Fish and Wildlife Service. 1997. Endangered and threatened wildlife and plants: final determination of critical habitat for the southwestern willow flycatcher. Federal Register 62(140):39129-39147; and correction Federal Register 62(161):44228.
U.S. Fish and Wildlife Service. 1997. Biological Opinion on the November 1997 - fall test flow from Glen Canyon Dam. 30 October 1997 Memorandum, Phoenix Field Office.
U.S. Fish and Wildlife Service. 1997. Review of Sufficient Progress in implementation of the Elements of the Reasonable and Prudent Alternative from the
December 21, 1994, Biological Opinion on the Operations of Glen Canyon Dam. 5 December 1997 Memorandum, Phoenix Field Office.
Valdez, R.A. and R. J. Ryel. 1995. Life history and ecology of the humpback chub (Gila cypha) in the Colorado River, Grand Canyon, Arizona: Final Report. Glen Canyon Environmental Studies Report, Salt Lake City.
Valdez, R. 1997. Effects of an experimental flood on fish and backwaters in the Colorado River, Grand Canyon, Arizona. Pp. 60-62 in Grand Canyon Monitoring and Research Center. Glen Canyon Dam beach/habitat-building flow: abstracts and executive summaries, April 1997. Grand Canyon Monitoring and Research Center, Flagstaff.
Valdez, R.A. and R.J. Ryel. 1997. Life history and ecology of the humpback chub in the Colorado River in Grand Canyon, Arizona. Pp. 3-31 in van Riper, C., III and E. Deschler, editors. Proceedings of the Third Biennial Conference of Research on the Colorado Plateau. Transactions and Proceedings Series NPS/NRNAU/NRTP-97/12, National Park Service, Washington, D.C.
Valdez, R.A. and R.D. Williams. 1993. Ichthyofauna of the Colorado and Green rivers in Canyonlands National Park, Utah. Pp. 2-22 in Rowlands, P.G., C. van Riper III, and M.K. Sogge, editors. Proceedings of the First Biennial Conference on Research in Colorado Plateau National Parks. Transactions and Proceedings Series NPS/NRNAU/NRTP-93-10, National Park Service, Washington, D.C.
Webb, R.H., T.S. Melis and P.G. Griffiths. Debris flows and the Colorado River. A chapter in Grand Canyon geology. Oxford University Press, in press.
Webb, R.H., J.C. Schmidt, G.R. Marzolf, and R.A. Valdez, editors. The controlled flood in Grand Canyon. American Geophysical Union Geophysical Monograph 110. Washington.
Wiele, S.M., J.B. Graf, and J.D. Smith. 1996. Sand deposition in the Colorado River in the Grand Canyon from flooding of the Little Colorado River. Water Resources Research 32:3579-3596.
Whitmore, R.C. 1977. Habitat partitioning in a community of passerine birds. Wilson Bulletin 89:253-265.
Woodbury, A.M. and H.N. Russell. 1945. Birds of Navajo country. Bulletin of the University of Utah 35:1-157.
Woods, J.O., T.G. Carr, P.W. Price, L.E. Stevens and N.S. Cobb. 1996. Growth of coyote willow and the attack and survival of a mid-rib galling sawfly, Euura sp. Oecologia 108:712-722.
Yeatts, M. 1998. 1997 data recovery at five sites in the Grand Canyon. Hopi Cultural Preservation Office, Kykosmovi.