Nutrients

Role of Nutrients in Fish Population Dynamics below Glen Canyon Dam The 2012-2014 rainbow trout population decline corresponded with a decline in condition for other large-bodied native fish like humpback chub, flannelmouth sucker, and bluehead sucker. These declines in fish population size and body condition occurred at the same time as a decline in drift biomass in the foodbase below Glen Canyon Dam. Primary production in the Colorado River is nutrient limited (soluble reactive phosphorous or SRP). Seasonal estimates of primary production just above the LCR are highly correlated with SRP measured at the Glen Canyon Dam. Primary production is linked to foodbase production, native fish condition, and rainbow trout condition and recruitment. [1]

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Updates [2] [3] [4] [5] [6] [7] [8]

Links and Information Nitrogen & Phosphorus Dynamics below Glen Canyon Dam The influence of Lake Powell on the suspended sediment-phosphorus dynamics of the Colorado River inflow to Lake Mead Nutrients Gages USGS 09380000 COLORADO RIVER AT LEES FERRY, AZ Papers and Presentations 2017 The Role of Nutrients in Colorado River Ecosystem Dynamics 2011 [http://www.nrcresearchpress.com/doi/abs/10.1139/f96-268?journalCode=cjfas#.WOO7hlXyvmE Deegan et al. 2011. Effects of fish density and river fertilization on algal standing stocks, invertebrate communities, and fish production in an arctic river. Canadian Journal of Fisheries and Aquatic Sciences Nutrient Supplementation Programs Corps Dworshak Nutrient Supplementation Study Aims To Boost Kokanee, Listed Bull Trout Dworshak Nutrient Supplementation Program EA Upper Columbia Nutrient Supplementation Project Dewatto River Nutrient Supplementation Study Redfish Lake Sockeye Salmon: Nutrient Supplementation as a Means of Restoration Kootenai River Ecosystem Restoration (Nutrient Restoration) [https://collaboration.idfg.idaho.gov/FisheriesTechnicalReports/Res06-13%20Hardy%202003-2005%20K%20River%20Recovery%20Investigations.pdf Kootenai River Fisheries Recovery Investigations: Ecosystem Rehabilitation. Project Progress Report. 2003-2005 Annual Report Other Stuff