Difference between revisions of "FOOD BASE"
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'''1999''' | '''1999''' | ||
| + | *Oberlin, G. E., J. P. Shannon, and D. W. Blinn. 1999. Watershed influence on the macroinvertebrate fauna of ten major tributaries of the Colorado River through Grand Canyon, Arizona. Southwestern Naturalist 44:17–30. | ||
| + | *Haden, G. A., D. W. Blinn, and J. P. Shannon. 1999. Driftwood: an alternative habitat for macroinvertebrates in a large southwestern river. Hydrobiologia 397:179–186. | ||
*[http://www.gcmrc.gov/library/reports/biological/Foodbase/Oberlin1999.pdf Oberlin et al. Watershed influence on the macroinvertebrate fauna of ten major tributaries of the Colorado River through Grand Canyon, Arizona. The Southwestern Naturalist 44(1):17-30. ] | *[http://www.gcmrc.gov/library/reports/biological/Foodbase/Oberlin1999.pdf Oberlin et al. Watershed influence on the macroinvertebrate fauna of ten major tributaries of the Colorado River through Grand Canyon, Arizona. The Southwestern Naturalist 44(1):17-30. ] | ||
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'''1997''' | '''1997''' | ||
| + | *Stevens, L. E., J. P. Shannon, and D. W. Blinn. 1997. Colorado River benthic ecology in Grand Canyon, Arizona, USA: dam, tributary and geomorphological influences. Regulated Rivers: Research and Management 13:129–149. | ||
*[http://www.riversimulator.org/Resources/GCMRC/PhysicalResources2/Shaver1997.pdf Shaver et al. Effects of suspended sediment and desiccation on the benthic tailwater community in the Colorado River, USA. Hydrobiologia 357: 63–72, 1997. ] | *[http://www.riversimulator.org/Resources/GCMRC/PhysicalResources2/Shaver1997.pdf Shaver et al. Effects of suspended sediment and desiccation on the benthic tailwater community in the Colorado River, USA. Hydrobiologia 357: 63–72, 1997. ] | ||
*[http://www.academia.edu/29251275/Colorado_River_benthic_ecology_in_Grand_Canyon Stevens et al. 1997. Colorado River benthic ecology in Grand Canyon, Arizona, USA: Dam, tributary, and gomorphological influences. Regulated Rivers: Research and Management, Vol. 13, 129–149 (1997)] | *[http://www.academia.edu/29251275/Colorado_River_benthic_ecology_in_Grand_Canyon Stevens et al. 1997. Colorado River benthic ecology in Grand Canyon, Arizona, USA: Dam, tributary, and gomorphological influences. Regulated Rivers: Research and Management, Vol. 13, 129–149 (1997)] | ||
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'''1991''' | '''1991''' | ||
| + | *Blinn, D. W. and G. A. Cole. 1991. Algal and invertebrate biota in the Colorado River: comparison of pre- and post-dam conditions. In: National Research Council, editor, Colorado River ecology and dam management. National Academy Press, Washington, D.C. Pp. 102–123. | ||
*[http://www.riversimulator.org/Resources/GCMRC/FoodBase/Haury1991.pdf Haury 1991. Zooplankton of the Colorado River: Glen Canyon Dam to Diamond Creek] | *[http://www.riversimulator.org/Resources/GCMRC/FoodBase/Haury1991.pdf Haury 1991. Zooplankton of the Colorado River: Glen Canyon Dam to Diamond Creek] | ||
*[https://www.gcmrc.gov/library/reports/gces/Blinn1991.pdf Blinn and Cole. 1991. Algal and Invertebrate Biota in the Colorado River: Comparison of Pre- and Post-Dam Conditions. In Colorado River Ecology and Dam Management.] | *[https://www.gcmrc.gov/library/reports/gces/Blinn1991.pdf Blinn and Cole. 1991. Algal and Invertebrate Biota in the Colorado River: Comparison of Pre- and Post-Dam Conditions. In Colorado River Ecology and Dam Management.] | ||
Revision as of 08:04, 21 June 2018
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The Aquatic Food Base below Glen Canyon DamThe Colorado River below Glen Canyon Dam has been altered by dam-induced modifications to the river’s flow, temperature, and sediment supply. Nonnative species have also changed the natural system. Nonnative fish are thought to prey on and compete with native fish, including the endangered humpback chub (Gila cypha). These impacts have likely changed both the amount and sources of energy that fuel the aquatic food web and the flows of energy within the food web. Installation of the dam created a relatively clear, cool aquatic environment below the dam that now allows aquatic plants to capture the sun’s energy, and they in turn are now consumed by a few species, including scuds (Gammarus lacustris), midges (Family: Chironomidae), blackflies (Simulium arcticum), and New Zealand mudsnails (Potamopyrgus antipodarum). The first three species can provide food for both native and nonnative fishes, but fish cannot digest the New Zealand mudsnail. Desired Future Condition for the Aquatic Food BaseThe aquatic food base will sustainably support viable populations of desired species at all trophic levels. Assure that an adequate, diverse, productive aquatic foodbase exists for fish and other aquatic and terrestrial species that depend on those food resources. |
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