Difference between revisions of "FOOD BASE"
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*[http://pubs.usgs.gov/of/2010/1031/of2010-1031.pdf Short-Term Effects of the 2008 High-Flow Experiment on Macroinvertebrates in Colorado River Below Glen Canyon Dam, Arizona] | *[http://pubs.usgs.gov/of/2010/1031/of2010-1031.pdf Short-Term Effects of the 2008 High-Flow Experiment on Macroinvertebrates in Colorado River Below Glen Canyon Dam, Arizona] | ||
*[http://pubs.usgs.gov/of/2010/1075/of2010-1075.pdf Basal Resources in Backwaters of the Colorado River Below Glen Canyon Dam—Effects of Discharge Regimes and Comparison with Mainstem Depositional Environments] | *[http://pubs.usgs.gov/of/2010/1075/of2010-1075.pdf Basal Resources in Backwaters of the Colorado River Below Glen Canyon Dam—Effects of Discharge Regimes and Comparison with Mainstem Depositional Environments] | ||
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| + | '''2001''' | ||
| + | *[http://www.riversimulator.org/Resources/GCMRC/FoodBase/Shannon2001b.pdf Shannon et al. 2001. Aquatic food base response to the 1996 test flood below Glen Canyon Dam, Colorado River, Arizona. Ecological Applications, 11(3), 2001, pp. 672–685.] | ||
'''1999''' | '''1999''' | ||
*[http://www.gcmrc.gov/library/reports/biological/Foodbase/Oberlin1999.pdf Watershed influence on the macroinvertebrate fauna of ten major tributaries of the Colorado River through Grand Canyon, Arizona] | *[http://www.gcmrc.gov/library/reports/biological/Foodbase/Oberlin1999.pdf Watershed influence on the macroinvertebrate fauna of ten major tributaries of the Colorado River through Grand Canyon, Arizona] | ||
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| + | '''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. ] | ||
'''1991''' | '''1991''' | ||
Revision as of 08:54, 11 May 2017
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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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