CS34 River Dynamics
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
 
GreenMB, Desert Research Institute and University of Nevada, Reno-Graduate Program of Hydrologic Sciences, Reno, USA, mbgreen@dri.edu
Fritsen, C, H, Desert Research Institute, Reno, USA, cfritsen@dri.edu
 
NUTRIENT LIMITATION OF PERIPHYTON GROWTH IN THE TRUCKEE RIVER
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An evaluation of nitrogen (N) and phosphorous (P) resource limitation of algal growth along the Truckee River corridor was undertaken to evaluate the intrinsic potential for site-specific periphyton research and resource management opportunities within a watershed that is P limited at it origins (Lake Tahoe) and N limited at its terminus (Pyramid Lake). N:P ratios of stream water and cobble aufwuchs, the ratio of ectoenzymatic alkaline phosphatase to aminopeptidase activity, and periphyton biomass accrual bioassays (nutrient diffusing substrata) all support the trend from P to N limitation of algal growth as the Truckee River flows towards Pyramid Lake. However, the balance between P to N limitation between Lake Tahoe and Pyramid Lake is non-linear and often switches between P and N limitation particularly in then upper watershed where suburban-impacted subwatersheds have little influence.