Difference between revisions of "FOOD BASE"
From Glen Canyon Dam AMP
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">GROUP MEMBERS</h2> | ! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">GROUP MEMBERS</h2> | ||
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">News</h2> | ! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">News</h2> | ||
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| + | 2016 | ||
| + | *'''[https://www.usgs.gov/news/river-food-webs-threatened-widespread-hydropower-practice/ River Food Webs Threatened by Widespread Hydropower Practice]''' | ||
| + | *'''[http://www.eurekalert.org/pub_releases/2016-05/osu-hor050216.php/ Hydropeaking of river water levels is disrupting insect survival, river ecosystems]''' | ||
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2013 | 2013 | ||
*'''[http://www.redorbit.com/news/science/1112927299/lessons-from-grand-canyon-dams-destabilize-river-food-webs-082013/ Lessons From The Grand Canyon: Dams Destabilize River Food Webs]''' | *'''[http://www.redorbit.com/news/science/1112927299/lessons-from-grand-canyon-dams-destabilize-river-food-webs-082013/ Lessons From The Grand Canyon: Dams Destabilize River Food Webs]''' | ||
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| + | ! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Recent slides</h2> | ||
| − | [[Image:USGS- Food web of the Grand Canyon- SLIDE.jpg | | + | |- |
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| + | [[Image:USGS- Food web of the Grand Canyon- SLIDE.jpg |600px]] | ||
[[File:Invertebrate production exhibits stepped declines downstrea from tributaries Slide 23.jpg |600px]] | [[File:Invertebrate production exhibits stepped declines downstrea from tributaries Slide 23.jpg |600px]] | ||
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*[http://www.gcmrc.gov/research_areas/food_base/food_base_default.aspx USGS- GCMRC Aquatic Food Base Link] | *[http://www.gcmrc.gov/research_areas/food_base/food_base_default.aspx USGS- GCMRC Aquatic Food Base Link] | ||
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2016 | 2016 | ||
| + | *'''[http://bioscience.oxfordjournals.org/content/early/2016/04/30/biosci.biw059 Kennedy et al. 2016: Flow Management for Hydropower Extirpates Aquatic Insects, Undermining River Food Webs]''' | ||
*'''[http://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR16_Muehlbauer.pdf Food availability in the Little Colorado River over space and time]''' | *'''[http://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR16_Muehlbauer.pdf Food availability in the Little Colorado River over space and time]''' | ||
*'''A Life History Bottleneck for Aquatic Insects Arising from Load Following''' | *'''A Life History Bottleneck for Aquatic Insects Arising from Load Following''' | ||
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2013 | 2013 | ||
| − | *'''[http://www.gcmrc.gov/about/foodbase/Cross%20et%20al._EM_2013.pdf Food-web dynamics in a large river discontinuum]''' | + | *'''[http://www.gcmrc.gov/about/foodbase/Cross%20et%20al._EM_2013.pdf Cross et al. 2013: Food-web dynamics in a large river discontinuum]''' |
*'''[http://pubs.usgs.gov/fs/2013/3039/fs2013-3039.pdf Native and nonnative fish populations of the Colorado River are food limited - Evidence from new food web analyses]''' | *'''[http://pubs.usgs.gov/fs/2013/3039/fs2013-3039.pdf Native and nonnative fish populations of the Colorado River are food limited - Evidence from new food web analyses]''' | ||
*'''[http://www.gcmrc.gov/about/foodbase/WellardKelley_et%20al.%202013.pdf Macroinvertebrate diets reflect tributary inputs and turbidity-driven changes in food availability in the Colorado River downstream of Glen Canyon Dam]''' | *'''[http://www.gcmrc.gov/about/foodbase/WellardKelley_et%20al.%202013.pdf Macroinvertebrate diets reflect tributary inputs and turbidity-driven changes in food availability in the Colorado River downstream of Glen Canyon Dam]''' | ||
Revision as of 14:03, 9 May 2016
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Food Base USGS- GCMRC Definition The 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.
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